ASTM E2021__09.pdf - Designation E2021 – 09 Standard Test Method for Hot-Surface Ignition Temperature of Dust Layers1 This standard is issued under

ASTM E2021__09.pdf - Designation E2021 – 09 Standard Test...

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Designation: E2021 – 09 Standard Test Method for Hot-Surface Ignition Temperature of Dust Layers 1 This standard is issued under the fixed designation E2021; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon ( ´ ) indicates an editorial change since the last revision or reapproval. 1. Scope 1.1 This test method covers a laboratory procedure to determine the hot-surface ignition temperature of dust layers, that is, measuring the minimum temperature at which a dust layer will self-heat. The test consists of a dust layer heated on a hot plate. 2, 1.2 Data obtained from this test method provide a relative measure of the hot-surface ignition temperature of a dust layer. 1.3 This test method should be used to measure and describe the properties of materials in response to heat and flame under controlled laboratory conditions and should not be used to describe or appraise the fire hazard or fire hazard risk of materials, products, or assemblies under actual fire conditions. However, results of this test method may be used as elements of a fire risk assessment that takes into account all of the factors that are pertinent to an assessment of the fire hazard risk of a particular end use product. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety and health practices and determine the applica- bility of regulatory limitations prior to use. Specific precau- tionary statements are given in Section 8 . 2. Referenced Documents 2.1 ASTM Standards: 3 E771 Test Method for Spontaneous Heating Tendency of Materials 4 E1445 Terminology Relating to Hazard Potential of Chemi- cals E1491 Test Method for Minimum Autoignition Tempera- ture of Dust Clouds 2.2 IEC Standard: 5 IEC 1241-2-1 Electrical Apparatus for Use in the Presence of Combustible Dust; Part 2: Test Methods—Section 1: Methods for Determining the Minimum Ignition Tempera- tures of Dusts, Method A 3. Terminology 3.1 Definitions: For definitions of other terms used in this standard see Terminology E1445 . 3.2 Definitions of Terms Specific to This Standard: 3.2.1 hot-surface ignition temperature of a dust layer , n —lowest set temperature of the hot plate that causes ignition of the dust layer. 3.2.2 ignition of a dust layer , n —initiation of self-heating or combustion in a material under test. 3.2.3 ignition time , n —time between the start of heating and the point at which the maximum temperature or flaming combustion is reached. 3.2.4 temperature rise, D T , n —the difference between T max and the initial set temperature of the hot plate.
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  • Winter '17
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