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5.1 Firefighters are routinely exposed to radiant heat in the course of their fireground activities. In some cases, firefighters have reported burn injuries under clothing where there is no evidence of damage to the exterior or interior layers of the firefighter protective clothing.5 Low levels of transmitted radiant energy alone, or a combination of the transmitted radiant energy and stored energy released through compression, can be sufficient to cause these types of injuries. This test method was designed to measure both the transmitted and stored energy in firefighter protective clothing material systems under a specific set of laboratory exposure conditions.5.2 The intensity of radiant heat exposure used in this test method was chosen to be an approximate midpoint representative of ordinary fireground conditions as defined for structural firefighting (1, 2).6 The specific radiant heat exposure was selected at 8.5 ± 0.5 kW/m2 (0.20 ± 0.012 cal/cm2-s), since this level of radiant heat can be maintained by the test equipment and produces little or no damage to most NFPA 1971-compliant protective clothing systems.5.2.1 Utech (2) defined ordinary fireground conditions as having air temperatures ranging from 60 to 300 °C and having heat flux values ranging from 2.1 to 21.0 kW/m2 (0.05 to 0.5 cal/cm2-s).5.3 Protective clothing systems include the materials used in the composite structure. These include the outer shell, moisture barrier, and thermal barrier. It is possible that they will also include other materials used on firefighter protective clothing such as reinforcement layers, seams, pockets, flaps, hook and loop, straps, or reflective trim.5.4 The transmission and storage of heat energy in firefighter protective clothing is affected by several factors. These include the effects of wear and use conditions of the protective clothing system. In this test method, conditioning procedures are provided for the laundering of composite samples prior to testing, and also composite sample moisture preconditioning. The amount of moisture added during preconditioning typically falls into a worst-case amount in terms of predicted heat transfer, as suggested by Barker (3).5.5 Two different procedures for conducting the test are provided in this test method. Procedure A measures only the transmitted energy that passes through the composite, without compression, during the exposure time. In this approach, the length of the radiant exposure is likely to be sufficient in the prediction of a second-degree burn injury. Procedure B involves using a fixed radiant heat exposure time to determine if a second-degree burn injury will or will not be predicted. If a second-degree burn injury is predicted, the time to a second-degree burn injury is reported. If a second-degree burn injury is not predicted, the result is indicated as “no predicted burn.” This procedure includes recommended fixed radiant exposure times.1.1 This test method uses one of two procedures to measure: (1) heat energy, which can be directly transmitted through the multilayer structure without compressive force, that can result in predicted burn injury, or (2) heat energy directly transmitted through the multilayer structure, followed by applying a compressive force, which rapidly releases stored heat energy in the multilayer structure that can result in a predicted burn injury.1.1.1 This test method is applicable only to protective clothing systems that are suitable for exposure to heat and flames.1.1.2 Flame resistance of the material system shall be determined prior to testing according to the applicable performance or specification standard, or both, for the material’s end use.1.2 This test method establishes procedures for moisture preconditioning of firefighter protective clothing material systems.1.3 The second-degree burn injury prediction used in this standard is based on a limited number of experiments on forearms of human subjects.1.3.1 The length of exposures needed to generate a second-degree burn injury in this test method exceeds the exposure times found in the limited number of experiments on human forearms.1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are mathematical conversions to English units or other units commonly used for thermal testing.1.5 This standard is used to measure and describe the properties of materials, products, or assemblies in response to radiant heat under controlled laboratory conditions but does not by itself incorporate all factors required for fire hazard or fire risk assessment of the materials, products, or assemblies under actual fire conditions.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. Specific precautionary information is found in Section 7.1.7 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.

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5.1 This test method is based on Test Method F903 for measuring resistance of chemical protective clothing materials to penetration by liquids. This test method is normally used to evaluate specimens from individual finished items of protective clothing and individual samples of materials that are candidates for items of protective clothing.5.1.1 Finished items of protective clothing include gloves, arm shields, aprons, gowns, coveralls, hoods, and boots.5.1.2 The phrase “specimens from finished items” encompasses seamed and other discontinuous regions as well as the usual continuous regions of protective clothing items.5.2 Medical protective clothing materials are intended to be a barrier to blood, body fluids, and other potentially infectious materials. Many factors can affect the wetting and penetration characteristics of body fluids, such as surface tension, viscosity, and polarity of the fluid, as well as the structure and relative hydrophilicity or hydrophobicity of the materials. The surface tension range for blood and body fluids (excluding saliva) is approximately 0.042 to 0.060 N/m (1) .7 To help simulate the wetting characteristics of blood and body fluids, the surface tension of the synthetic blood is adjusted to approximate the lower end of this surface tension range. The resulting surface tension of the synthetic blood is approximately 0.042 ± 0.002 N/m.5.3 The synthetic blood mixture is prepared with a red dye to aid in visual detection and a thickening agent to simulate the flow characteristics of blood.5.4 Part of the protocol in Procedures A and B in Table 1 for exposing the protective clothing material specimens with synthetic blood involves pressurization of the test cell to 13.8 kPa [2 psig]. This hydrostatic pressure has been documented to discriminate between protective clothing material performance and to correlate with visual penetration results that are obtained with a human factors validation (2). Some studies, however, suggest that mechanical pressures exceeding 345 kPa [50 psig] can occur during clinical use (3, 4). Therefore, it is important to understand that this test method does not simulate all the physical stresses and pressures that are exerted on protective clothing garments during actual use. This test method is offered to identify those protective clothing materials that warrant further evaluation with a microbiological challenge.5.5 Since this test method uses visual observation rather than analytical measurements for determination of penetration, use this test method as a preliminary evaluation for possible penetration of blood and other body fluids. Perform subsequent testing with a microbiological challenge and analytical technique using Test Method F1671.NOTE 1: No viral resistance claims can be made based on this test method, as materials can pass the test method and fail Test Method F1671.5.6 Testing without considering degradation by physical, chemical, and thermal stresses which could negatively impact the performance of the protective barrier could lead to a false sense of security. Consider tests which assess the impact of storage conditions and shelf life for disposable products, and the effects of laundering and sterilization for reusable products. The integrity of the protective barrier can also be compromised during use by such effects as flexing and abrasion (5) . It is also possible that prewetting by contaminating materials such as alcohol and perspiration can also compromise the integrity of the protective barrier. If these conditions are of concern, evaluate the performance of protective clothing materials for synthetic blood penetration following an appropriate preconditioning technique representative of the expected conditions of use.5.7 While this test method involves a qualitative determination of the protective clothing material resistance to penetration by synthetic blood under specific test conditions, it is possible to use this test method as a material quality control or assurance procedure.5.7.1 If this procedure is used for quality control, perform proper statistical design and analysis of the data when more than three specimens are tested. This type of analysis includes, but is not limited to, the number of individual specimens tested, the average percent passing or failing, or both, with a standard deviation. Data reported in this way helps to establish confidence limits concerning product performance. Examples of acceptable sampling plans are found in references such as MIL-STD-105, ANSI/ASQC Z1.4, and ISO 2859-1.1.1 This test method is used to evaluate the resistance of materials used in protective clothing to penetration by synthetic blood under conditions of continuous liquid contact. Protective clothing pass/fail determinations are based on visual detection of synthetic blood penetration.1.1.1 This test method is not always effective in testing protective clothing materials having thick, inner liners which readily absorb the synthetic blood.1.2 This test method is a means for selecting protective clothing materials for subsequent testing with a more sophisticated barrier test as described in Test Method F1671.1.3 This test method does not apply to all forms or conditions of blood-borne pathogen exposure. Users of the test method must review modes for work/clothing exposure and assess the appropriateness of this test method for their specific application.1.4 This test method addresses only the performance of materials or certain material constructions (for example, seams) used in protective clothing. This test method does not address the design, overall construction and components, or interfaces of garments, or other factors which may affect the overall protection offered by the protective clothing.1.5 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.1.6 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.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.

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