Hardener iso-MTHPA

Technical specifications 6-10-124-91

   The main purpose of the iso-MTHPA (iso-methyltetrahydrophtalyc anhydride) hardener is obtained impregnating and casting compounds for electrical engineering purpose. The compositions based on hardener have a sufficiently high viability, it are cured at 120-160°C and also demonstrate high strength and dielectric parameters. 

Iso-MTHPA Hardener product specifications

Dynamic  viscosity at  25°C, Pa·s, no more than

0.12

Gel time at 150°C, hrs

4-8

Density at 20°C, kg/m3

1.170-1.230

Stoichiometric coefficient

3.92

Acid number mgKOH/g of product 

650-690

Mass fraction  of the free carboxyl groups, %,  to acid number, no more than

5

 

 The properties of polymer materials based  on the epoxy resin and iso-MTHPA hardener

Gel time at 100°C, min, not  less than

300

Breaking tension, kg /cm2

at bending

at tensile

at squeezing

 

130

127

70

Impact strength, kJ·cm2

22.0

Relative elongation at break, %

7.0

Martens yield temperature, °С

110

Specific electrical resistance, Ω·m

1·1014

Dielectric permittivity at 106Hz

3.5

Water sorptionin for 24 hrs at 20 °С, %

0.022