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Methyl Tetrahydrophthalic Anhydride Viscosity

Methyl tetrahydrophthalic anhydride, also known as methyl tetrahydrophthalic anhydride, referred to as MeTHPA, which is a liquid mixture of various isomers that are initially isomerized. Molecular weight is 166.17. It is light yellow transparent oily liquid with relative density of 1.20-1.22. The freezing point is less than 一20 ℃. Boiling point is 115 ~ 155 ℃. Viscosity is in the range of (25℃) 40-80 mPa.s. The refractive index ranges from 1.4960 to 1.4980. The content of anhydride group is more than 40%. The neutralization equivalent is 81-85. Flash point is 137-150 C. It can be soluble in acetone, ethanol, toluene, and so on. Good stability in air and it is not easy to crystallize. It has low toxicity, having the LD502102 mg per kg.

Appearance Light yellow transparent liquid Light yellow transparent liquid
Chromaticity (platinum-cobalt color number) ≤ 100 200 300
Solidification Point/℃ < -15 -20 -15
Viscosity (25 ℃)/mPa.s 40~70 ≤50 70~120
Acid value /(mgKOH/g) 650~675 660~685 630~650
The mass fraction of anhydride /%≥ 42 41.5 39
Free acid content /%≤ 0.8 1.0 2.5
Heating Decrease/%≤ 1.0 1.0 1.5
Foreign brands have C-570, C-572, B-570 (Japan), HN-2200, QH-200 (Japan).
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