ISO-CAST® A776
Transparent casting resin
ISO-CAST® A776 is a cold-curing 2-component casting resin based on light-stable polymers (hybrid system). The casting compound has a medium casting viscosity. The material is a self-healing gel, suitable for electrical insulation applications. ISO-CAST® A776 has good adhesion to metals and plastics. The resistance to hydrolysis is excellent. The system does not contain any volatile inert diluents. The product is RoHS compliant according to EU Directives 2011/65/EU (“RoHS”) and 2015/863/EU (“RoHS III”).
Technical data
Component A
Colour
Viscosity (25°C; rot.; 1 s-1)
Viscosity (25°C; rot.; 10 s-1)
Density (23°C)
Transparent
Approx. 6200 mPas
Approx. 6200 mPas
Approx. 0,97 g/cm³
Component B
Colour
Viscosity (25°C; rot.; 1 s-1)
Viscosity (25°C; rot.; 10 s-1)
Density (23°C)
Transparent
Approx. 6000 mPas
Approx. 6000 mPas
Approx. 0,97 g/cm³
Mixture
Mixing ratio resin : hardener
Colour
1 : 1 parts by weight
Transparent (other colours on request)
Density (23°C)
Approx. 0,97 g/cm³
Pot life (23°C)
Approx. 70 min
Mixed viscosity (25°C; rot.; 1 s-1)
Mixed viscosity (25°C; rot.; 10 s-1)
Approx. 6100 mPas
Approx. 6100 mPas
Cured product
Mixing ratio resin: hardener
under standard curing condition
1 : 1 parts by weight
(14 days 23°C / 50% relative humidity) unless otherwise stated
Penetration
Approx. 220 1/10 mm
Glass transition temperature (midset)
< -50°C
Long-term temperature resistance
Approx. 150 °C
Dielectric strength
> 22 kV/mm
Dielectric loss factor tan δ (25°C; 50 Hz)
Approx. 0,006
Dielectric constant ε (25°C; 50 Hz)
Approx. 2,80
Thermal conductivity
Approx. 0,20 W/K×m
Coefficient of thermal expansion
Approx. 3,00×10-4 K-1
Tracking resistance
KA 3c
UV resistance
Good; slight brownish discoloration possible after a longer period of time
Storage and transport
Store in a dry and airtight, closed container at 10 – 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.
Cleaning
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).
Processing
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 well and knead for 3 minutes. Before casting a homogeneous mass, free of streaks, must be obtained. Then pour immediately and do not scrape the mixing vessel. Air bubbles in the reaction mass 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.