定价： 590元 / 折扣价： 502 元 加购物车

5.1 Diisocyanates are used in the production of polyurethane foams, plastics, elastomers, surface coatings, and adhesives (5, 6). It has been estimated that the production of TDI will steadily increase during the future years.5.2 Diisocyanates are irritants to eyes, skin, and mucous membrane and are respiratory sensitizers. Chronic exposure to low concentrations of diisocyanates produces an allergic sensitization which may progress into asthmatic bronchitis (7, 8).5.3 The United States Occupational Safety and Health Administration (OSHA) has a permissible exposure limit (PEL) for 2,4-TDI of 0.02 ppm or 0.14 mg/m3 as a ceiling limit. There is no OSHA PEL for 2,6-TDI (9). The American Conference of Governmental Industrial Hygienists (ACGIH) has a time–weighted average (TWA) Threshold Limit Value (TLV) of 0.001 ppm or 0.007 mg/m3 and a short-term exposure limit (STEL) of 0.005 ppm or 0.036 mg/m3 for either 2,4-TDI, or 2,6-TDI, or for a mixture of 2,4- and 2,6-TDI (10).1.1 This test method describes the determination of 2,4-toluene diisocyanate (2,4-TDI) and 2,6-toluene diisocyanate (2,6-TDI) in air samples collected from workplace atmospheres in a cassette containing a glass-fiber filter impregnated with 1-(2-pyridyl)piperazine (1-2 PP). This procedure is effective for determining the vapor content of atmospheres. It is advisable to perform a field extraction for atmospheres containing aerosols to avoid the possibility of an underestimation.1.2 This test method uses a high-performance liquid chromatograph (HPLC) equipped with a fluorescence or an ultraviolet (UV) detector (1-4).2,3 An ultra high performance liquid chromatograph (UPLC) can also be used, provided that its performance is equivalent to what is stated in this standard.1.3 The validated range of the test method, as written, is from 1.4 to 5.6 μg of 2,4-TDI and 2,6-TDI which is equivalent to approximately 9.8 to 39 ppb for 2,4-TDI and 2,6-TDI based on a 20-L air sample. The HPLC method using an UV detector is capable of detecting 0.078 μg of 2,4-TDI and 0.068 μg of 2,6-TDI in a 4.0-mL solvent volume, which is equivalent to 0.55 ppb for 2,4-TDI and 0.48 ppb for 2,6-TDI based on a 20-L air sample.1.4 The isomers of 2,4-TDI and 2,6-TDI can be separated utilizing a reversed phase column for the HPLC method. Because industrial applications employ an isomeric mixture of 2,4- and 2,6-TDI, the ability to achieve this separation is important.1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.6 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 Section 9 for specific precautions.1.7 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.

定价： 590元 / 折扣价： 502 元 加购物车

This specification establishes the requirements for polypropylene (PP) piping system components such as pipe, fittings, valves, and manifolds used in water service lines, hot-and-cold water distribution, hydronic heating, and irrigation systems to transport industrial process fluids, effluents, slurries, municipal sewage, etc. The piping system components covered here are made to metric sizes and IPS schedule 80 sizes, and pressure rated for water service and distribution supply. When tested according to the procedures provided herein, the piping components shall adhere to specified requirements for workmanship, dimensions, longitudinal reversion, melt flow rate, impact resistance, thermal stability and oxidative induction time (OIT), hydrostatic pressure, thermocycling, and oxidative stability in potable chlorinated water.1.1 This specification establishes requirements for polypropylene (PP) piping system components made to metric sizes and IPS schedule 80 sizes, and pressure rated for water service and distribution supply (see Appendix X1). Included are criteria for materials, workmanship, dimensions and tolerances, product tests, and marking for polypropylene (PP) piping system components such as pipe, fittings, valves, and manifolds.1.2 The components governed by this specification shall be permitted for use in water service lines, building supply lines, hot-and-cold water distribution, hydronic heating, and irrigation systems.1.3 The pipe and fittings produced under this specification shall be permitted to be used to transport industrial process fluids, effluents, slurries, municipal sewage, etc. The user shall consult the manufacturer to determine whether the material being transported is compatible with the polypropylene piping system and will not affect the service life beyond limits acceptable to the user.1.4 Units—The values stated 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.1.5 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.

定价： 590元 / 折扣价： 502 元 加购物车

定价： 590元 / 折扣价： 502 元 加购物车

1.1 This specification covers requirements and test methods for materials, dimensions, workmanship, elongation, brittleness, pipe stiffness, and markings for single wall corrugated polypropylene (PP) pipe and double wall corrugated polypropylene (PP) pipe. It covers nominal sizes 6 in. through 30 in. (152 mm through 762 mm).1.2 The corrugated polypropylene pipes governed by this standard are intended for use in non-pressure applications for sanitary sewers, storm sewers and drainage pipes. Single wall corrugated polypropylene pipe shall not be used for sanitary sewer applications.1.3 The values stated 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.1.4 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.

定价： 0元 / 折扣价： 0 元

This specification covers requirements, test methods, materials, and marking for polypropylene (PP), open bottom, buried chambers of corrugated wall construction used for collection, detention, and retention of stormwater runoff. Applications include commercial, residential, agricultural, and highway drainage, including installation under parking lots and roadways. Chambers are produced in arch shapes with dimensions based on chamber rise, chamber span, and wall stiffness. They are manufactured with integral feet that provide base support. They may include perforations to enhance water flow and must meet test requirements for arch stiffness, flattening, and accelerated weathering. The successful performance of the product depends upon the type and depth of bedding and backfill, and care in installation. This specification includes requirements for the manufacturer to provide chamber installation instructions to the purchaser.1.1 This specification covers requirements, test methods, materials, and marking for polypropylene (PP), open bottom, buried chambers of corrugated wall construction used for collection, detention, and retention of stormwater runoff. Applications include commercial, residential, agricultural, and highway drainage, including installation under parking lots and roadways.1.2 Chambers are produced in arch shapes with dimensions based on chamber rise, chamber span, and wall stiffness. Chambers are manufactured with integral feet that provide base support. Chambers may include perforations to enhance water flow. Chambers must meet test requirements for arch stiffness, flattening, and accelerated weathering.1.3 Analysis and experience have shown that the successful performance of this product depends upon the type and depth of bedding and backfill, and care in installation. This specification includes requirements for the manufacturer to provide chamber installation instructions to the purchaser.1.4 The values stated 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.1.5 This standard does not purport to address water quality issues or hydraulic performance requirements associated with its use. It is the responsibility of the user to ensure that appropriate engineering analysis is performed to evaluate the water quality issues and hydraulic performance requirements for each installation.1.6 The following safety hazards caveat pertains only to the test method portion, Section 6, of this specification: 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.1.7 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.

定价： 590元 / 折扣价： 502 元 加购物车

This specification covers requirements and test methods for triple wall polypropylene pipe and fittings with nominal inside diameters of 30 to 60 in. [750 to 1600 mm]. These requirements are intended to provide pipe and fittings suitable for underground use for non-pressure sanitary sewer systems. Pipe and fittings produced in accordance with this specification shall be installed in compliance with Practice D2321. Pipe and fittings with a interior wall, a exterior wall and an annular corrugated profile middle wall are covered by this specification.1.1 This specification covers requirements and test methods for corrugated double and triple wall polypropylene pipe and fittings. The nominal inside diameters covered are 6 in. to 60 in. [150 mm to 1500 mm].1.2 The requirements of this specification are intended to provide pipe and fittings for underground use for non-pressure sanitary sewer systems. Pipe and fittings produced in accordance with this specification shall be installed in compliance with Practice D2321.1.3 This specification covers pipe and fittings with an annular corrugated wall and an essentially smooth interior wall (that is, double wall) (Fig. 1) and pipe and fittings with an annular corrugated wall and an essentially smooth interior and exterior wall (that is, triple wall) (Fig. 2).FIG. 1 Typical Corrugated Double Wall PipeFIG. 2 Typical Corrugated Triple Wall Pipe1.4 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 non-conformance with the standard.1.5 The following precautionary statement applies only to Section 7 of this specification. 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.

定价： 590元 / 折扣价： 502 元 加购物车

定价： 590元 / 折扣价： 502 元 加购物车

定价： 590元 / 折扣价： 502 元 加购物车

定价： 590元 / 折扣价： 502 元 加购物车

定价： 590元 / 折扣价： 502 元 加购物车

定价： 590元 / 折扣价： 502 元 加购物车

This specification establishes requirements and test methods for materials, impact strength, appearance, surface flame spread, and windload resistance of siding products manufactured from polypropylene material. The use of polypropylene recycled plastic in this product shall conform to the specified requirements. The siding shall be made principally of polypropylene compound, prepared from polypropylene homopolymer or copolymer. The polypropylene compound shall be compounded so as to provide the heat stability and weather exposure stability required for the siding market application.1.1 This specification establishes requirements and test methods for materials, impact strength, appearance, surface flame spread, and wind load resistance of siding products manufactured from polypropylene material. Methods of indicating compliance with this specification are also provided.1.2 The use of polypropylene recycled plastic in this product shall be in accordance with the requirements in Section 4.1.3 Siding produced to this specification shall be installed in accordance with manufacturer’s installation instructions for the specific product to be installed.NOTE 1: Information with regard to siding maintenance shall be obtained from the manufacturer.1.4 The values stated in inch-pound units are to be regarded as the standard. The SI units given in parentheses are for information purposes only.1.5 The following precautionary caveat pertains to the test method portion only, Section 6 of this specification: 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.NOTE 2: There is no known ISO equivalent to this standard.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.

定价： 590元 / 折扣价： 502 元 加购物车

1.1 This specification covers factory-made propylene and polypropylene (PP) plastic-lined ferrous metal pipe and fittings, primarily intended for conveying corrosive liquids and gases. Requirements for materials, workmanship, dimensions, design, construction, working pressures and temperatures, test methods, and markings are included. Note 1-In this specification, propylene plastics cover those materials defined as both polypropylene plastics and propylene plastics in Definitions D883. Both materials are identified as "PP" on the product. Note that this is at variance with Abbreviations D1600, where PP is the abbreviation for polypropylene. Note 2-This specification does not include products coated with PP nor does it define the suitability of PP-lined components in chemical environments. 1.2 The ferrous piping products shall meet the requirements of the relevant specifications listed in 1.2.1. Nominal sizes from 1/2 through 12 in. in Class 125, 150, and 300-psi are covered. Note 3-The PP sealing faces may prevent achievement of the full pressure rating of the ferrous housings. For pressure limitations, the manufacturer should be consulted. Note 4-Flanged fittings are not available in sizes 1/2 and 3/4. 1.2.1 For Ferrous Pipe: ASTM Title of Specification Designation Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and A 53 Seamless (Types E and S) Seamless Carbon Steel Pipe for High-Temperature Service A 106 Electric-Resistance Welded Steel Pipe A 135 Electric-Welded Low-Carbon Steel Pipe for the Chemical A 587 Industry Seamless and Welded Austenitic Stainless Steel Pipe A 312 Electric-Resistance Welded Carbon and Alloy Steel Mechanical A 513 Tubing :et 1.2.2 For Ferrous Flanges: :bt ASTM Title of Specification Designation Gray Iron Castings A 48 Forgings, Carbon Steel, for Piping Components A 105 Gray Iron Castings for Valves, Flanges, and Pipe Fittings A 126 Forgings, Carbon Steel, for General-Purpose Piping A 181 Forged or Rolled Alloy-Steel Pipe Flanges, Forged Fittings, A 182 and Valves and Parts for High-Temperature Service Carbon-Steel Castings Suitable for Fusion Welding for High- A 216 Temperature Service (Grade WCB). Gray Iron Castings for Pressure-Containing Parts for A 278 Temperatures Up to 650

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