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22.214.171.124 Responsibility for Classification
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For gas mixtures other than those containing ammonia and nonflammable gases, flammability of gas mixtures shall be classified in accordance with CGA P-23, Standard for Categorizing Gas Mixtures Containing Flammable and Nonflammable Components, or by physical testing in accordance with the requirements of ASTM E681, Standard Test Method for Concentration Limits of Flammability of Chemicals (Vapors and Gases), or ISO 10156, Gases and gas mixtures — Determination of fire potential and oxidizing ability for the selection of cylinder valve outlets. [55:126.96.36.199]
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