ISO-POX® HP 89/7

ISO-POX® HP 89/7 is a cold-curing, highly transparent epoxy casting resin for casting electrical components. Coatings and moldings made from ISO-POX® HP 89/7 form tack-free, scratch-resistant surfaces. ISO-POX® HP 89/7 contains no phthalates or silicones and does not tend to become brittle. The compound has good anti-corrosion properties and high adhesion to metal, ceramics and many plastics. The standard mixing ratio of resin : hardener is 2 : 1 parts by weight.


Technical data



Viscosity (25°C; rot.; 1 s-1)

Viscosity (25°C; rot.; 10 s-1)

Density (23°C)


Approx. 1200 mPas

Approx. 1100 mPas

Approx. 1,15 g/cm³



Viscosity (25°C; rot.; 1 s-1)

Viscosity (25°C; rot.; 10 s-1)

Density (23°C)

Yellowish clear

Approx. 55 mPas

Approx. 50 mPas

Approx. 1,02 g/cm³


Mixing ratio resin : hardener


2 : 1 parts by weight

Yellowish clear (other colours on request)

Density (23°C)

Approx. 1,11 g/cm³

Pot life (23°C)

Gel time (23°C)

Approx. 20 min

Approx. 40 min

Mixed viscosity (25°C; rot.; 1 s-1)

Mixed viscosity (25°C; rot.; 10 s-1)

Approx. 1100 mPas

Approx. 500 mPas

Dielectric strength

Approx. 7 kV/mm

Cured product

Mixing ratio resin: hardener

under standard curing condition

2:1 parts by weight

(14 days 23°C / 50% relative humidity) unless otherwise stated

Hardness Shore A

(23°C; 14d RT 50% rel. h.)

Hardness Shore A

(23°C; oven curing: 4hRT + 24h80°C)

> 90


> 90

Hardness Shore D

(23°C; 14d RT 50% rel. h.)

Hardness Shore D

(23°C; oven curing: 4hRT + 24h80°C)

Approx. 75


Approx. 76

Long-term temperature resistance

Short-term temperature resistance

Approx. 120°C

Approx. 180°C

Glass transition temperature (midset)

Approx. 38°C

Tensile strength (5A specimen)

(2 mm thickness; speed: 10 mm/min; 23°C)

Elongation at break (5A specimen)

(2 mm thickness; speed: 10 mm/min; 23°C)

Approx. 27 N/mm2


Approx. 40%

Tear resistance

(W-specimen; incision; speed: 10 mm/min; 23°C)

Approx. 85 N/mm

Dielectric strength

> 20 kV/mm

Dielectric loss factor tan δ (25°C; 50 Hz)

Approx. 0,008

Dielectric constant ε (25°C; 50 Hz)

Approx. 4,20

Thermal conductivity

Approx. 0,30 W/K×m

Coefficient of thermal expansion

Approx. 60×10-6 K-1

Tracking resistance

KA 3c

Water absorption after 28 days

in water (immersion; 23°C)

Approx. 5,30%

Water vapour permeability

(75% relative humidity; 23°C; 1 mm thickness)

Approx. 3,40×10-6 g/(day×mm2)

Storage and transport

Store in a dry and airtight, closed container at 15 – 35°C. Can be stored for at least 12 months in original sealed containers under the above conditions. Short-term deviations during transport and storage are acceptable. When stored at low temperatures, component A may experience crystallization effects. These are reversible. To do this, heat component A to 40 – 50°C for several hours.


To ensure good adhesion of the cast resin the customer should individually test the suitability of the involved surfaces. Possible pre-treatments like cleaning, activation processes (plasma process) etc. should also be taken into account. The contact surfaces should be free of dirt such as dust, grease or water. For cleaning we recommend ISO-RC® Degreaser for wipe degreasing or ISO-RC® Flux-Off + ISO-RC® Spraywash for spray degreasing (available in 400 ml spray cans).


Stir up the resin container thoroughly before use to remove any possible sedimentation. Weigh the resin and hardener in the desired mixing ratio and mix for 1 – 3 minutes (depending on mixed quantity and processing time). Apply suitable mixing speed in order to ensure complete homogeneous mixing without introducing too many air bubbles into the reaction mass. The ideal processing temperature is 20 – 25°C. In general, curing is delayed at lower temperatures and accelerated at higher temperatures. When using a double chamber bag, empty the corners thoroughly and knead for 3 minutes. Before casting, a homogeneous mass, free of streaks, must be obtained. Pour immediately afterwards and do not scrape the mixing vessel. Air bubbles that have been stirred in, can be removed before the end of the potlife by evacuating the material or carefully fanning the surface with a hot air gun. Machine casting is also possible.

The EC safety data sheet provides information on safety-relevant product properties.