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Graphite. Method for determination of lead

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Reagents. Orthophosphoric acid. Specifications

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Non-ionic surface active agents. Polyalkoxylated derivatives. Determination of hydroxyl value. Phthalic anhydride method

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Soluble sodium silicate. Specifications

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Petroleum bitumens. Method for determination of ductility

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Fired heaters for refineries. General technical requirements

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