GB/T 8323.2-2008 in English

《GB/T 8323.2-2008塑料 烟生成 第2部分：单室法测定烟密度试验方法》由TC15（全国塑料标准化技术委员会）归口，TC15SC4（全国塑料标准化技术委员会通用方法和产品分会）执行，主管部门为中国石油和化学工业联合会。
GB/T 8323《塑料　烟生成》分为2个部分,本部分为GB/T 8323的第2部分。
本部分规定了片状材料、复合材料或厚度不超过25mm组合件的试样，垂直放置于配有规定等级热辐射源的密闭橱柜中，在使用或不使用引燃火焰的情况下，测量从曝露面生成烟的方法。这一测试方法适用于所有的塑料，也可以适用于其他材料的评估（如橡胶、纺织品覆盖物、涂漆面、木材和其他材料）。

1.1 This part of GB/T 8323 specifies a method of measuring smoke production from the exposed surface of specimens of essentially flat materials, composites or assemblies not exceeding 25 mm in thickness when placed in a horizontal orientation and subjected to specified levels of thermal irradiance in a closed cabinet with or without the application of a pilot flame. This method of test is applicable to all plastics and may also be used for the evaluation of other materials (e.g. rubbers, textile-coverings, painted surfaces, wood and other materials).
1.2 It is intended that the values of optical density determined by this test be taken as specific to the specimen or assembly material in the form and thickness tested, and are not to be considered inherent, fundamental, properties.
1.3 The test is intended primarily for use in research and development and in fire safety engineering of buildings, trains, ships, etc., and not as a basis for ratings for building codes or other purposes. No basis is provided for predicting the density of smoke that may be generated by the materials upon exposure to heat and flame under other (actual) exposure conditions, nor is any correlation established with measurements derived from other test methods. This test procedure excludes the effect of irritants on the eye.
NOTE: This test procedure addresses the loss of visibility due to smoke density, which generally is not related to irritancy potency, as explained in Part 1 of this International Standard.
1.4 It is emphasized that smoke production from a material varies according to the irradiance level to which the specimen is exposed. In making use of the results of this method, it should be borne in mind that the results are based on exposure to the specific irradiance levels of 25 kW/m2 and 50 kW/m2.

Contents
Foreword I
1 Scope
2 Normative References
3 Terms and Definitions
4 Principles of the Test
5 Suitability of a material for testing
6 Specimen construction and preparation
7 Apparatus and ancillary equipment
8 Test Environment
9 Setting-up and Calibration Procedures
10 Test Procedure
11 Expression of Results
12 Precision
13 Test report
Appendix A (Normative) Calibration of Heat Flux Meter
Appendix B (Informative) Variability in the Specific Optical Density of Smoke Measured in the Single-chamber Test
Appendix C (Informative) Determination of Mass Optical Density
Appendix D (Informative) Precision Data from Tests on Intumescent Materials
Bibliography