Naphthol AS-PH
Structural Formula:
Name: 2-hydroxy-3-naphthoic acid o-ethoxyanilide
Molecular formula: C19H17O3N
Molecular weight: 307.4
Quality Standards of Naphthol AS-PH
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Description
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Specification
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Appearance
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light yellowish white even powder
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Shade and strength when coupling with Naphthol As on cotton fibre
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similar to the standard
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Primary melting point of the dried
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≥ 150 ℃
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Insoluble matter in alkali
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≤ 0.5%
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Percentage of screenings(80 mesh)
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≤ 5.0%
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