Phthalic Anhydride:
Appearance: white flake or white powder
Usage: used for manufacturing of plasticizer, resin, painting, medicine
Specification:
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Item
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Index
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||
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Top grade
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First grade
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Qualified product
|
|
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Appearance
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white scaly or crystalline powder
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white scaly or crystalline powder with slight colors
|
|
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Molten Chroma(Chroma no. )≤
|
20
|
50
|
100
|
|
Thermostable Chroma(Chroma no. )≤
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50
|
150
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-
|
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Chroma of vitriol(Chroma no. )≤
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60
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100
|
150
|
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Crystallization point°C≥
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130.5
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130.3
|
130.0
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Purity(mass fraction)%≥
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99.50
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99.50
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99.00
|
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Free acid(mass fraction)≤ %
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0.20
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0.30
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0.50
|
|
Ash(mass fraction)%≤
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0.05
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-
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-
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