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Methyl tetrahydrophthalic anhydride (MTHPA) 

1\Chemical name: Methyl tetrahydrophthalic anhydride 

Alias: 3A-methyl-5, 6-dihydro-4H-isobenzofuran-1, 3-dione 

English name: MTHPA 

CAS No: 19438-64-3 

Molecular formula: C9H10O3 

Molecular weight: 166.18 

It is soluble in benzene and acetone, etc. It is hygroscopic. 

Structural formular 

Type: 3, 4-methyl THPA isomers mixture 
Quality index 

Item 
Mark 

SHY-9601 
SHY-9602 
SHY-9603 
SHY-9604 

Appearance 
Light yellow transparent liquid 

Colour and lustre. (platinum-cobalt ) 
≤ 300 
≤ 200 
≤ 80 
≤ 120 

Crystallization point degree 
≤ -15 

Acid valuemgKOH/g 
660.0~685.0 

Content% 
≥ 40.50 

ViscosityPa. S(25degree) 
≤ 0.0500 
≤ 0.0400 
≤ 0.0400 
≤ 0.0550 

Densityg/cm3(20degree) 
1.210± 0.05 

Free acid % 
≤ 0.50 

Volatile matter%(120degree) 
<2.00 

Components structure 
3-MTHPA/4-MTHPA=70/30, it is similar with Japan HN-2000 
3-MTHPA/4-MTHPA=30/70, it is similar with JapanHN-2200 

2\Performance characteristics 

2.1 It has high purity and light color and luster. It can be directly adjusted into all kinds of colorful epoxy resin products. 

2.2 It has low viscosity. It has the characteristics like: Good casting, embedment and impregnation technology. It can improve the performance of curing material and the affinity of lamination and basic material. 

2.3 It has the characteristics like: Stable performance, low freezing point and long using life. It can be stored for a long time at room temperature and easy for pipeline transportation. It is suitable for production automation and severe cold region. 

2.4 It has small volatility and low toxicity. Its irritation to human eyes and skin is small. 

2.5 It has good dissolubility. This product can dissoluble with all epoxy resins. The mixing viscosity is low. 

3\Main usage: 

It is widely used in electrical, electronic and casting industry. It is the main raw material of mutual inductor, insulated paint, high-voltage electrical apparatus, glass fiber reinforced plastics pipelines in oilfield and glass fiber reinforced plastics insulating bush. 

4\Storage, packing and transportation: 

25kg plastic barrel or 220kg iron barrel. This product's performance is stable. In the storage and transportation process, it should be sealed and avoid moisture. It should be stored in dry and ventilated warehouse. It can be stored one year at room temperature.