JIS K 7242-2:2015

Plastics - Smoke Generation - Part 2: Determination Of Optical Density By A Single-chamber Test

Japanese Standards Association

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Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principles of the test
5 Suitability of a material for testing
5.1 Material geometry
5.2 Physical characteristics
6 Specimen construction and preparation
6.1 Number of specimens
6.2 Size of specimens
6.3 Specimen preparation
6.4 Wrapping of specimens
6.5 Conditioning
7 Apparatus and ancillary equipment
7.1 General
7.2 Test chamber
7.3 Specimen support and heating arrangements
7.4 Gas supply
7.5 Photometric system
7.6 Chamber leakage
7.7 Cleaning materials
7.8 Ancillary equipment
8 Test environment
9 Setting-up and calibration procedures
9.1 General
9.2 Alignment of photometric system
9.3 Selection of compensating filter(s)
9.4 Linearity check
9.5 Calibration of range-extension filter
9.6 Chamber leakage rate test
9.7 Burner calibration
9.8 Radiator cone calibration
9.9 Cleaning
9.10 Frequency of checking and calibration procedure
10 Test procedure
10.1 General
10.2 Preparation of test chamber
10.3 Tests with pilot frame
10.4 Preparation of photometric system
10.5 Loading the specimen
10.6 Recording of light transmission
10.7 Observations
10.8 Termination of test
10.9 Testing of different modes
11 Expression of results
11.1 Specific optical density D[S]
11.2 Clear-beam correction factor D[c]
12 Precision
13 Test report
Annex A (normative) - Calibration of heat flux meter
Annex B (informative) - Variability in the specific optical
density of smoke measured in the
single-chamber test
Annex C (informative) - Determination of mass optical density
Annex D (informative) - Precision data from tests on
intumescent materials
Bibliography

Abstract

Defines a procedure for the measurement of 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 test method applies to all plastics and can also be used for evaluating other materials (including rubbers, textile-coverings, paintend surfaces, wood and other building materials).