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[塑料] 塑料阻燃性深度总结(一)可燃性的实验室测试

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发表于 2013-10-20 10:26:05 | 显示全部楼层 |阅读模式
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本帖最后由 846082533 于 2015-12-31 14:59 编辑 <br /><br />
塑料阻燃性深度总结
上海北京顺德编辑
原著:SERGEI V. L EVCHIK
1.1 引言
1.2 聚合物燃烧与测试
1.2.1 可燃性的实验室测试
1Flammability of polymers is assessed primarily through ignitability, flame spread, and heat release  
聚合物的燃烧性主要从易燃性、火焰传播性、释热性三个方面进行评估。
2Numerous flammability tests are known and are performed either on representative samples or on an assemble d product. Tests can be small, intermediate, or full scale  
许多可燃性测试可用试样或最终产品进行,在规模上分为小型、中型及大型测试。
3A V-0 classification is given to material that is extinguished in less than 10   s after any flame application. The mean combustion time for the five specimens tested (10 flame applications) should not exceed   5   s, and no combustible drips can be observed. A V-1 classification is received by a sample with maximum combustion time < 50   s and mean combustion time for five specimens <   25   s. No combustible drips should be observed. The sample is classified V-2 if it satisfies the combustion time criteria of V-1 but flammable drips igniting the cotton are allowed
UL94V0级评定标准:每次点燃后10s内即发生自熄,5个试样(10次点燃)的平均燃烧时间不超过5s,无具有引燃性的熔融滴落。V-1级评定标准:试样最长的燃烧时间小于30s,平均燃烧时间小于25s,无具有引燃性的熔融滴落。V-2级评定标准:符合V-1级标准的燃烧时间限制,允许具有引燃性的熔融滴落。
4The LOI test does not represent a real fire scenario, but it is good as a    screening   tool because it gives a numerical value instead of a discrete classification (e.g., V-0, V-1, V-2).
虽然LOI法仅能测试实验室条件而非真实火情下材料的易燃性,但其可提供较详实的数据而非不连贯的等级划分(例如, V-0, V-1, V-2)
5The cone calorimeter test is a bench-scale (medium-sized) test developed at NIST which quickly gained popularity in the academic community as well as for standardization purposes (e.g., ISO 5660-1, ASTM E-1354). It is also used as a tool for fire protection engineering because it allows prediction of large-scale test results. A cone calorimeter measures consumption of oxygen from a burning sample 100 ×   100  mm in area and up to    50   mm thick. The heat release is calculated from the oxygen consumption data.
锥形量热仪测试法是美国国家标准及技术研究院(NIST)制定与规范的一个中等规模实验室测试法,它很快得到了学术界的普遍认可,并为其制定了相关标准(例如 ISO 5660-1, ASTM E-1354)。因该法所得数据与大规模测试所得数据具有一定的相关性,故它也是研究火安全防护工程的重要方法。Cone法可测试面积为100mm ×100mm、厚度不超过50mm试样的燃烧耗氧量,并由耗氧量计得样品的释热量。


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