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5.1 This test method is used to measure chemical permeation through specimens of protective clothing under the condition of intermittent contact of a test chemical with the specimen. In many applications, protective clothing is contacted intermittently to chemicals, not continuously as is tested by Test Method F739.
5.2 This test method is normally used to evaluate flat specimens from finished items of protective clothing and of materials that are candidates for items of protective clothing.
5.3 In some cases, it may be of interest to compare permeation behaviors that occur under conditions of intermittent contact with those that occur during continuous contact. Test Method F739 is recommended for measuring permeation under the conditions of continuous contact of the test chemical with the clothing specimen.
5.4 The breakthrough detection time, standardized breakthrough time, and the cumulative permeation are key measures of the effectiveness of a clothing material as a barrier to the test chemical. Such information is used in the comparison of clothing materials during the process of selecting clothing for protection from hazardous chemicals. Long breakthrough detection times and standardized breakthrough times and low cumulative permeation are characteristics of better barriers.
5.4.1 The reporting of a standardized breakthrough time greater than a specific time period does not mean that no chemical has permeated through the protective clothing material as the standard breakthrough time is determined based on the permeation rate reaching a level of 0.1 ??g/cm2 min, indicating that some chemical has already permeated the specimen prior to the reported standardized breakthrough time.
5.4.2 Cumulative permeation represents the mass that permeates through a protective clothing material over a specific period of time for a specific surface area of material. It is possible to use this information to model how much chemical can enter an item of protective clothing for a particular exposure based on a knowledge of the exposed surface area, the free volume inside the protec..........
(6)欧标防护服由两个子标准体系组成,防感染的EN14126标准和抗气体、液体、固体颗粒渗透的TYPE子标准。按照针对防护的物体不同,欧标防护服分为6类TYPE:TYPE 1及TYPE 2类针对气体级防护、TYPE 3/4/6针对液体防护、TYPE 5针对固体及气溶胶颗粒防护及衣服的抗撕扯强度。欧标防护服的抗合成血液渗透测试参照标ISO 16603。...
为了模拟血液和体液的浸润性特征,调节合成血液的表面张力,使其接近上述表面张力范围的下端。合成血液的表面张力为42±2mN/m。合成血液是以水为基础的增稠剂和红色染料,以让视觉来帮助检测渗透。一束流体以设定的速度和距离投射到口罩或口罩材料上,以评估其对流体渗透的阻力。防护材料遵循的评价标准ASTM F1670标准规定了防护服材料对合成血液渗透的耐受性的标准测试方法。...
),EN 368(防护服抗液体渗透性能测试方法)等。 ...
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