ASTM E1995用单独密闭室圆锥形辐射源和水平导向试样测量烟雾不透明度的试验方法
日期:2012-02-08 12:00
at which it was tested. The literature contains some information on a relationship between optical density and specimen thickness [1].
Results obtained from this test method are affected by variations in the position of the specimen and radiometer relative to the radiant heat source, since the relative positioning affects the radiant heat flux (see also Appendix X2).
The test results have proven sensitive to excessive accumulations of residue in the chamber, which serve as additional insulator
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