5.1 Assessing the propensity of a nanomaterial to cause cytotoxicity to the cells of a target organ can assist in preclinical development.5.2 The standard historical cytotoxicity testing of materials and extracts of materials has used fibroblasts and is well documented in Practice F813, Test Method F895, and ISO 10993-5. The use of macrophages and micron size particles has also provided information on cytotoxicity and stimulation using Practice F1903.5.3 This test method adds to the cytotoxicity test protocols by using target organ cells. Two quantitative assays measuring LDH leakage and MTT reduction are used to estimate cytotoxicity.5.4 This test method may not be predictive of events occurring in all types of nanomaterial applications, and the user is cautioned to consider the appropriateness of the test for various types of nanomaterial and their applications. This procedure should only be used to compare the cytoxicity of a series of related nanomaterials. Meaningful comparison of unrelated nanomaterials is not possible without additional characterization of physicochemical properties of each individual nanomaterial in the assay matrix.1.1 This test method provides a methodology to assess the cytotoxicity of suspensions of nanoparticulate materials in porcine proximal tubule cells (LLC-PK1) and human hepatocarcinoma cells (Hep G2), which represent potential target organs following systemic administration.1.2 This test method is part of an in vitro preclinical characterization cascade.1.3 This test method consists of a protocol utilizing two methods for estimation of cytotoxicity, 3-(4,5-dimethylthiazolyl-2)-2,5-diphenyltetrazolium bromide (MTT) reduction and lactate dehydrogenase (LDH) release.1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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4.1 This guide provides guidance on how a surrogate material can be selected and inserted into a field workflow for confidence checks and process assessments of on-site biological assessment technologies to demonstrate that the technology is working in the field environment in the hands of operators.4.2 Use of a surrogate material instead of an inactivated or attenuated biological agent (or its components) is beneficial due to (1) ease of production and handling, (2) ease of acquisition and transportation, (3) the ability to use the material with minimal equipment and facility constraints, for example, biosafety containment, and (4) minimized risk of contamination of personnel, equipment and the environment with a potential biological agent.4.3 This guide covers the basic design of confidence checks and process assessments that may be used to target (1) the workflow in the field, (2) the performance of the on-site biological assessment technology, and (3) the operator’s ability to process a material in the field workflow, in order to increase confidence in each component. These demonstrations provide emergency responders with insight into routine operation of a nucleic acid-based biological assessment technology and the opportunity to assess and demonstrate their capabilities according to a defined training program in their jurisdiction.4.4 This guide may be used to aid operators in the routine use of any nucleic acid-based on-site biological assessment technology. Using a surrogate material, operators are able to gain confidence in their ability to perform operations in the workflow and gather routine information (for example, operator performance, assessment results over time) in the field.4.5 This guide should be used in accordance with Practices E2458 and Guide E2770.4.6 This guide should be used according to the appropriate risk reduction measures (including personal protective equipment) that are needed for the biosafety level of the surrogate material (preferably Biosafety Level 1; the level should be verified with the provider of the surrogate material).4.7 This guide is not meant to provide performance characterization of biological agent assays used with on-site biological assessment technologies.1.1 This guide describes factors to consider when developing, selecting, and using a surrogate material for evaluating the operational performance of nucleic acid-based on-site biological assessment technologies. Operational performance includes the workflow, technology, operator, controls, and result reporting.1.2 Users of this guide include developers and manufacturers of on-site biological assessment technologies or surrogate materials, as well as the initial responder community and other operators of the technologies.1.3 This guide recommends the use of surrogate materials to support training; improve the knowledge, skills, and confidence of operators; and enable confidence check and process assessment demonstrations in support of jurisdictional biothreat mission capabilities as recommended in Guide E2770, Section 8.1.4 This guide recommends the use of surrogate materials in combination with a training program as articulated in Guide E2770 and coordinated among the initial responder organization, hazardous materials response unit, Urban Search and Rescue (US&R) team, National Guard Civil Support Team (CST), Laboratory Response Network (LRN) reference laboratory, local law enforcement, the Federal Bureau of Investigation (FBI), and other agencies as defined by jurisdictional protocols.1.5 This guide recommends the selection of a surrogate material that challenges the workflow in a way similar to the challenge imposed by suspected biological agents encountered in real-world emergency response scenarios while posing minimal health and safety risks.1.6 This guide describes considerations when using a surrogate material for a confidence check of nucleic acid-based on-site biological assessment technologies.1.7 This guide describes factors involved in the use of a surrogate material to perform a process assessment when the operator has access to well-characterized nucleic acid-based assays specific to the surrogate material that enable the operator to target the analytical process applied to on-site biological assessment.1.8 This guide does not replace third-party validation of on-site biological assessment technologies to assess the ability of the technologies to correctly detect and identify a biological agent. This guide recommends that all on-site biological assessment technologies be demonstrated to perform according to internationally recognized consensus standards (for example, AOAC Standard Method Performance Requirements) as consistent with Guide E2770 and Practices E2458.1.9 For the purposes of this guide, sample collection should be performed according to Practices E2458.1.10 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.11 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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5.1 This test method is used to determine the ability of an engine crankcase oil to control wear that can develop in the field under low to moderate engine speeds and heavy engine torques. Side-by-side comparisons of two or more oils in delivery van fleets were used to demonstrate the field performance of various oils. The specific operating conditions of this test method were developed to provide correlation with the field performance of these oils.5.2 This test method, along with other test methods, defines the minimum performance level of the Category API CG-4 for heavy duty diesel engine lubricants. Passing limits for this category are included in Specification D4485.5.3 The design of the engine used in this test method is not representative of all modern diesel engines. Consider this factor, along with the specific operating conditions used to accelerate wear, when extrapolating test results.1.1 This engine lubricant test method is commonly referred to as the Roller Follower Wear Test. Its primary result, roller follower shaft wear in the hydraulic valve lifter assembly, has been correlated with vehicles used in stop-and-go delivery service prior to 1993. It is one of the test methods required to evaluate lubricants intended to satisfy the API CG-4 performance category. This test has also been referred to as the 6.2 L Test.1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.2.1 Exceptions—Where there is no direct SI equivalent, such as pipe fittings, thermocouple diameters, and NPT screw threads. Also, roller follower wear is measured in mils.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.4 Table of Contents:  Section 1Referenced Documents 2Terminology 3Summary of Test Method 4 5Reagents 7 Guidelines on Substitution 7.1Apparatus 6Preparation of Apparatus 8 New Engine Preparation 8.1 Installation of Auxiliary Systems and Miscellaneous Components 8.2Test Procedure 9 Description of Test Segments and Organization of Test Procedure Sections 9.1 Engine Parts Replacement 9.2 Engine Starting Procedure 9.3 Normal Engine Shutdown Procedure 9.4 Emergency Shutdown Procedure 9.5 Unscheduled Shutdown and Downtime 9.6 New Engine Break-In 9.7 Pretest Procedure 9.8 Fifty-Hour Steady State Test 9.9 Periodic Measurements 9.10 Oil Sampling and Oil Addition Procedures 9.11 End of Test (EOT) Procedure 9.12Calculation and Interpretation of Test Results 10 Environment of Parts Measurement Area 10.1 Roller Follower Shaft Wear Measurements 10.2 Oil Analysis 10.3 Assessment of Test Validity 10.4Final Test Report 11 Reporting Calibration Test Results 11.1 Report Forms 11.2 Interim Non-Valid Calibration Test Summary 11.3 Severity Adjustments 11.4Precision and Bias 12 Precision 12.1 Precision Estimate 12.2 Bias 12.3Keywords 13ANNEXESGuidelines for Test Part Substitution or Modification Annex A1Guidelines for Units and Specification Formats Annex A2Detailed Specifications of Apparatus Annex A3Calibration Annex A4Final Report Forms Annex A5Illustrations Annex A6Kinematic Viscosity at 100°C Procedure for the Roller Follower Wear Test Annex A7Enhanced Thermal Gravimetric Analysis (TGA) Procedure for Soot Measurement Annex A8Sources of Materials and Information Annex A9APPENDIXESPC-9 Reference Diesel Fuel Properties Appendix X1Diagnostic Data Review Appendix X21.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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5.1 This test method was developed to evaluate the viscometric performance of engine oils in turbocharged and intercooled four-cycle diesel engines. Results are obtained from used oil analysis.5.2 The test method is used for engine oil specification acceptance when all details of the procedure are followed.1.1 This test method covers an engine test procedure for evaluating diesel engine oils for performance characteristics, including viscosity increase and soot concentrations (loading).2 This test method is commonly referred to as the Mack T-8.1.2 This test method also provides the procedure for running an extended length T-8 test, which is commonly referred to as the T-8E and an abbreviated length test, which is commonly referred to as T-8A. The procedures for the T-8E and the T-8A are identical to the T-8 with the exception of the items specifically listed in Annex A8 and Annex A9 respectively. Additionally, the procedure modifications listed in Annex A8 and Annex A9 refer to the corresponding section of the T-8 procedure.1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.3.1 Exceptions—Where there is no direct SI equivalent such as the units for screw threads, National Pipe Threads/diameters, tubing size, sole source equipment suppliers, and oil consumption in grams per kilowatt-hour.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. See Annex A6 for specific safety precautions.1.5 A Table of Contents follows: 1Referenced Documents 2Terminology 3Summary of Test Method 4 5Apparatus 6 General Description 6.1 The Test Engine 6.2 Mack Test Engine 6.2.1 Engine Cooling System 6.2.2 Engine Oil System 6.2.3 Auxiliary Oil System 6.2.4 Crankcase Aspiration 6.2.5 Blowby Meter 6.2.6 Air Supply and Filtration 6.2.7 Fuel Supply 6.2.8 Intake Manifold Temperature Control 6.2.9Engine Fluids 7 Test Oil 7.1 Test Fuel 7.2 Engine Coolant 7.3 Cleaning Materials 7.4Preparation of Apparatus at Rebuild 8 Cleaning of Parts 8.1 Valves, Seats, Guides, and Springs 8.2 Cylinder Liner, Piston, and Piston Ring Assembly 8.3 Injectors and Injection Pump 8.4 Assembly Instructions 8.5 Measurements 8.6Laboratory and Engine Test Stand Calibration/Non-ReferenceRequirements 9 Calibration Frequency 9.1 Calibration Reference Oils 9.2 Test Numbering 9.3 New Laboratories and New Test Stands 9.4 Calibrated Laboratories and Test Stands 9.5 Calibration Test Acceptance 9.6 Failing Calibration Tests 9.7 Non-Reference Oil Test Requirements 9.8Procedure 10 Pretest Procedure 10.1 Engine Start-Up 10.2 Engine Shutdown 10.3 Test Cycle 10.4 Oil Addition/Drain 10.5 Oil Samples 10.6 Oil Consumption Calculations 10.7 Fuel Samples 10.8 Periodic Measurements 10.9 Blowby 10.10 Centrifugal Oil Filter Mass Gain 10.11 Oil Filter Δ P Calculation 10.12 Post Test 10.13Inspection of Fuel and Oil During Test 11 Oil Inspection 11.1 Fuel Inspections 11.2 Oil Consumption 11.3Report 12 Reporting Test Results 12.1 Deviations from Test Operational Limits 12.2 Electronic Transmission of Test Results 12.3 Plots of Operational Data 12.4Precision and Bias 13 Precision 13.1 Bias 13.2Keywords 14Annexes  Report Forms Annex A1Sensor Locations Annex A2Kinematic Viscosity At 100 °C For Test Method D5967 Samples Annex A3Enhanced Thermal Gravimetric Analysis (TGA) Procedure Annex A4Procurement of Test Materials Annex A5Safety Precautions Annex A6Data Dictionary Annex A7T-8E Extended Length Test Requirements Annex A8T-8A Abbreviated Length Test Requirements Annex A9Mack T-8A, T-8, and T-8E Fuel Requirements Annex A101.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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1.1 This specification covers cellulosic-fiber-based packaging materials and products associated with food, landscape waste, and other compost feedstocks, which are intended to be composted under aerobic conditions in municipal and industrial composting facilities, where thermophilic temperatures are achieved.1.2 This specification covers cellulosic-based uncoated and coated packaging materials and products and covers whole packaging products. Products covered in this specification include cellulosic fiber-based products produced from cellulosic pulp, corrugated materials, containerboard, paper, paperboard, and molded fiber.1.3 This specification excludes end items where thermoplastic polymer is laminated or extruded to cellulosic substrates.1.4 This specification is intended to establish the requirements for labeling cellulosic-fiber-based packaging materials and products as “compostable in aerobic municipal and industrial composting facilities” in accordance with the guidelines issued by the Federal Trade Commission,2 provided the label includes proper qualifications as to the availability of such facilities.1.5 The properties in this specification are those required to determine if packaging materials and products will compost satisfactorily in large-scale aerobic municipal or industrial composting where maximum throughput is a high priority and where intermediate stages of biodegradation must not be apparent to the end user for aesthetic reasons.1.6 This specification is technically equivalent to ISO 18606.1.7.1.7 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.9 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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1.1 This practice covers the introduction of a foreign substance into mammalian body that may induce the formation of an immune response. The immune response may lead to inadvertent tissue damage and be an undesirable event. In the standard protocols for biocompatibility testing, various studies in animals are done. These animals or their blood and tissues could be used to determine if immune responses have occurred and what types have occurred. At the current time, the immunologic testing in biocompatibility protocols is very limited. Techniques can be developed in the future which are simple, reliable, and sensitive.1.2 It is the purpose of this practice to delineate some possible test methods. It must be remembered that these are protocols for use in biocompatibility testing, they are not diagnostic tests for evaluation of human conditions. Diagnostic test for use on humans must go through evaluation at the regulatory agencies. The tests described here are clearly adaptable for use in humans and can be used for research purposes and provide data in clinical trials, but are not necessarily cleared for diagnostic purposes. This practice presents selected methods. Other validated methods may be equally applicable.1.3 The values state in SI units are to be regarded as the standard.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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4.1 This test method is intended to simulate the corrosion process of non-ferrous metals in diesel lubricants. The corrosion process under investigation is that believed to be induced primarily by inappropriate lubricant chemistry rather than lubricant degradation or contamination. This test method has been found to correlate with an extensive fleet database containing corrosion-induced cam and bearing failures.1.1 This test method is used to test diesel engine lubricants to determine their tendency to corrode various metals, specifically alloys of lead and copper commonly used in cam followers and bearings. Correlation with field experience has been established.41.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific hazard statements are given in 5.3.1, 6.5, 6.6, 6.7, 6.8, 6.9, 7.1.1, 7.1.2, and 7.1.5.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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5.1 Plating/coating Processes—This test method provides a means by which to detect possible hydrogen embrittlement of steel parts during manufacture by verifying strict controls during production operations such as surface preparation, pretreatments, and plating/coating. It is also intended to be used as a qualification test for new plating/coating processes and as a periodic inspection audit for the control of a plating/coating process.5.2 Service Environment—This test method provides a means by which to detect possible hydrogen embrittlement of steel parts (plated/coated or bare) due to contact with chemicals during manufacturing, overhaul and service life. The details of testing in a service environment are found in Annex A5.1.1 This test method describes mechanical test methods and defines acceptance criteria for coating and plating processes that can cause hydrogen embrittlement in steels. Subsequent exposure to chemicals encountered in service environments, such as fluids, cleaning treatments or maintenance chemicals that come in contact with the plated/coated or bare surface of the steel, can also be evaluated.1.2 This test method is not intended to measure the relative susceptibility of different steels. The relative susceptibility of different materials to hydrogen embrittlement may be determined in accordance with Test Method F1459 and Test Method F1624.1.3 This test method specifies the use of air melted SAE 4340 steel (Grade A, see 7.1.1) per SAE AMS 6415 (formerly SAE AMS-S-5000 and formerly MIL-S-5000) or an alternative VAR (Vacuum Arc Remelt) SAE 4340 steel (Grade B, see 7.1.1) per SAE AMS 6414, and both are heat treated to 260 to 280 ksi (pounds per square inch ×1000) as the baseline. This combination of alloy and heat treat level has been used for many years and a large database has been accumulated in the aerospace industry on its specific response to exposure to a wide variety of maintenance chemicals, or electroplated coatings, or both. Components with ultimate strengths higher than 260 to 280 ksi may not be represented by the baseline. In such cases, the cognizant engineering authority shall determine the need for manufacturing specimens from the specific material and heat treat condition of the component. Deviations from the baseline shall be reported as required by 12.1.2. The sensitivity to hydrogen embrittlement shall be demonstrated for each lot of specimens as specified in 9.5.NOTE 1: Extensive testing has shown that VAR 4340 steel may be used as an alternative to the air melted steel with no loss in sensitivity.2NOTE 2: VAR 4340 also meets the requirements in AMS 6415 and could be used as an alternative to air melt steel by the steel suppliers because AMS 6415 does not specify a melting practice.1.4 Test procedures and acceptance requirements are specified for seven specimens of different sizes, geometries, and loading configurations.1.5 Pass/Fail Requirements—For plating/coating processes, specimens must meet or exceed 200 h using a sustained load test (SLT) at the levels shown in Table 3.1.5.1 The loading conditions and pass/fail requirements for service environments are specified in Annex A5.1.5.2 If approved by the cognizant engineering authority, a quantitative, accelerated (≤ 24 h) incremental step-load (ISL) test as defined in Annex A3 may be used as an alternative to SLT.1.6 This test method is divided into two parts. The first part gives general information concerning requirements for hydrogen embrittlement testing. The second is composed of annexes that give specific requirements for the various loading and specimen configurations covered by this test method (see section 9.1 for a list of types) and the details for testing service environments.1.7 The values stated in the foot-pound-second (fps) system in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.9 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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4.1 It is intended that this practice be used by manufacturers, users, and testing agencies. The use of this practice establishes a uniform procedure for the melting or heating of hot-applied sealants and fillers. It is not intended to establish test procedures or conditions of test which are associated with each of the joint sealants and fillers.1.1 This practice establishes the procedure for melting or heating, or both, of hot-applied joint and crack sealants and fillers in preparation for the making of test specimens used in the laboratory evaluations of the sealants and fillers. Refer to the specific standard material specification for sampling requirements, test sample quantity, temperatures and times for melting and heating, and the number of specimens required for testing.1.2 This practice is applicable to the hot-applied joint and crack sealants and fillers used in both portland cement and asphaltic-concrete pavements.1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.1.4 Warning—Mercury has been designated by the EPA and many state agencies as a hazardous material that can cause central nervous system, kidney, and liver damage. Mercury, or its vapor, may be hazardous to health and corrosive to materials. Caution should be taken when handling mercury and mercury-containing products. See the applicable product Material Safety Data Sheet (MSDS) for details and EPA’s website—http://www.epa.gov/mercury/faq.htm—for additional information. Users should be aware that selling mercury and/or mercury-containing products into your state may be prohibited by state law.1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific precautions, see Section 7.1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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This specification covers forced-convection ventilated electrically-heated ovens and used for thermal endurance evaluation of electrical insulating materials. The ovens shall be classified according to ventilations: Type I and Type II. Rate of ventilation, set temperature, temperature variation, and thermal log time properties shall be determined using specified test methods.1.1 This specification covers forced-convection ventilated electrically-heated ovens, operating over all or part of the temperature range from 20 °C above the ambient temperature to 500 °C, and used for thermal endurance evaluation of electrical insulating materials.1.2 The specification requirements for Type I ovens are based on IEC Publication 60216-4-1, and are technically identical to it. The requirements for Type II ovens are essentially identical to the requirements of Specification D2436. This specification and an associated test method, D5374, have replaced Specification D2436.1.3 While the ovens covered by this specification are intended primarily for thermal endurance evaluation, their characteristics make them suitable for other applications as applicable.1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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1.1 This guide sets the minimum requirements which an analytical chemistry laboratory should meet to be recognized as competent to carry out specific analytical procedures. 1.2 Additional requirements and information which have to be disclosed for assessing competence or for determining compliance with other criteria may be specified by the organization or authority granting the accreditation, depending upon the specific character of the task of the laboratory. 1.3 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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4.1 Tests conducted in accordance with this practice are used to evaluate the stability of laminated glazing materials when they are exposed outdoors or used indoors. The relative durability of glazing in outdoor use can be very different depending on the location of the exposure because of differences in ultraviolet (UV) radiation, time of wetness, temperature, pollutants, and other factors. It cannot be assumed, therefore, that results from one exposure in a single location will be useful for determining relative durability in a different location. When comparing exposure results, at a minimum, the locations of exposure are to be as similar as possible with regard to critical factors such as the amount and rate of solar radiation deposited on the specimens, temperature and humidity levels during exposure. Exposures in several locations with different climates that represent a broad range of anticipated service conditions may be necessary.4.2 Because of year-to-year climatological variations, results from a single exposure test cannot be used to predict the absolute rate at which a material degrades. Several years of repeat exposures are needed to get an average test result for a given location.4.3 The results of short-term natural and accelerated exposure tests can provide an indication of relative outdoor performance, but they should not be used to predict the absolute long-term performance of a material. The results of tests conducted under natural exposure for less than twelve months will depend on the particular season of the year in which they begin.1.1 This practice is intended to cover procedures for the exposure of laminated glass materials to natural and accelerated weather.1.2 This practice is limited to the method by which the material is to be exposed and the general procedure to be followed. It is intended for use with finished articles of commerce as well as with all sizes and shapes of test specimens.1.3 Means of evaluation of the effects of weathering will depend on the intended use for the test material.1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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