Phthalic anhydride is a white solid and is an important raw material in chemical industry, especially for the manufacture of plasticizers.
important plasticizer. Used in the paint industry; production of unsaturated polyester resins for the manufacture of insulating varnishes and glass fiber reinforced plastics, also for pharmaceutical synthesis.
Specification
PRODUCT
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PHTHALIC ANHYDRIDE
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OPERATIVE
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GB/T 15336-2013
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NO.
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CHECK ITEM
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QUALITY INDEX
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RESULTS
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1
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APPEARANCE
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WHITE NEEDLE SHAPED CRYSTALS OR FLAKE-SHAPED SRYSTALS
|
WHITE NEEDLE SHAPED CRYSTALS
|
|
2
|
Fused chroma(Chroma No.)
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≤20
|
10
|
|
3
|
Chroma of therma stability(Chroma No.)
|
≤40
|
30
|
|
4
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Chroma of sulphuric acid(Chroma No.)
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≤40
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20
|
|
5
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Free acid(Mass fraction)%
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≤0.10
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0.028
|
|
6
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Purity%
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≥99.9
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99.94
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|
7
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Benzoic Acid%
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≤0.05
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0.001
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