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cis-1 2 3 6-Tetrahydrophthalic anhydride THPA CAS 935-79-5 

Payment Terms: T/T,L/C,WU 
Place of Origin: Sichuan, China (Mainland) 
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Product Detail

Model No.: C8H8O3
Production Capacity: 7000T/Year
Delivery Date: within 7 days
CAS No.: 935-79-5
Molecular Formula: C8H8O3
Molecular weight: 152.16
Soluble: REACTS
Melting point: 99±1℃
Iodine value: 164~168
Means of Transport: Ocean,Land,Air
Packing: According to customer requi...
Brand Name: MOSINTER
Vapor density: 5.2
Vapour pressure: <0.01 mm Hg
Sensibility: Moisture Sensitive
Flash(ing) point: 157.3℃

can be used as a modifier of alkyd resin, epoxy resin curing agent, unsaturated polyester resins, pesticides and pharmaceutical raw materials

Tetrahydrophthalic anhydride(THPA)(CAS: 935-79-5)




Light yellow liquid

Freezing   point, ℃


Acid   value, KOH/g


Volatile   Content, ≤


Soluble in benzene, acetone and so on, has the water absorbability. The proportion of 1.20. Contact with water to generate acid, corrosive. Flammable. Low toxicity, LD504590mg/kg.

Safety term 

S22 Do not breathe dust.

S24 Avoid contact with skin.

S26 In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.

S37 Wear suitable gloves.

S39 Wear eye / face protection.

S61 Avoid release to the environment. Refer to special instructions / safety data sheets.

Product purpose

USES: can be used as a modifier of alkyd resin, epoxy resin curing agent, unsaturated polyester resins, pesticides and pharmaceutical raw materials

USES 2: as intermediates in organic synthesis, four hydrogen of benzene anhydride are commonly used to produce alkyd resins and unsaturated polyester resin, paint, also used as the curing agent of epoxy resin, and also used in pesticide, sulfide regulator, plasticizer, surface active agent and so on. Four hydrogen of benzene anhydride as raw materials for the production of unsaturated polyester resin as main is to improve the resin of dry gas, especially in the production of high-grade resin putty, air dry paint's role is more obvious.


Used as a curing agent of epoxy resin adhesives, reference dosage 55 ~ 65, curing conditions of 140 ℃ or 200 ℃ / 16 h / 1 ~ 2 h, curing heat deformation temperature of 118 ℃. THPA mixed with epoxy resin is difficult, inconvenient operation, can be in the presence of sulfuric acid, five phosphorus oxide heterogeneous reaction liquid hydrogen four benzene anhydride, it is a mixture of four kinds of isomer, E - 51 epoxy resin curing the heat deformation temperature of 118 ℃.

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