ISO-CAST® BRW-N
Marking-free and removable potting compound
Fill casting of ISO-CAST® BRW-N
ISO-CAST® BRW-N is a cold-curing, removable, transparent 2-component casting compound based on polybutadiene. The product is free of isocyanates, epoxies and silicones. The mixing ratio is 1:1 parts by weight of resin to hardener, which enables easy and robust processing. The material does not require labeling according to the EU CLP regulation and can therefore be considered as advantageous in terms of occupational hygiene. ISO-CAST® BRW-N is very hydrophobic and therefore excellently suited as moisture protection in the telecommunications sector, in 1kV cable sets and for sealing many other electronic and electrical components. Even at low temperatures ISO-CAST® BRW-N exerts virtually no mechanical stress on sensitive electronic components (Tg < -50°C) and reliably protects against environmental influences. ISO-CAST® BRW-N contains no phthalates and does not tend to become brittle. Cured products can be easily removed again for maintenance or repair. ISO-CAST® BRW-N has a medium potting viscosity. The cured product shows good adhesion to metal, ceramics and many plastics. The product is RoHS compliant according to EU Directives 2011/65/EU (“RoHS”) and 2015/863/EU (“RoHS III”).
Area of application
Moisture protection in the telecommunications sector, in 1kV cable joints and for sealing many other electronic and electrical components.
Technical data
Resin
Colour
Viscosity (25°C; rot.; 1 s-1)
Viscosity (25°C; rot.; 10 s-1)
Density (23°C)
Clear to yellowish transparent
Approx. 1900 mPas
Approx. 1800 mPas
Approx. 0,90 g/cm³
Hardener
Colour
Viscosity (25°C; rot.; 1 s-1)
Viscosity (25°C; rot.; 10 s-1)
Density (23°C)
Clear to yellowish transparent
Approx. 1900 mPas
Approx. 1800 mPas
Approx. 0,94 g/cm³
Mixture
Mixing ratio resin : hardener
Colour
1 : 1 parts by weight
Clear to yellowish transparent (other colours on request)
Density (23oC)
Approx. 0,91 g/cm³
Pot life (23oC)
Gel time (23oC)
Approx. 30 min
Approx. 70 min
Mixed viscosity (25°C; rot.; 1 s-1)
Mixed viscosity (25 °C; rot.; 10 s-1)
Approx. 3600 mPas
Approx. 3500 mPas
Dielectric strength
> 5 kV/mm
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
Hardness Shore 00
(23°C; 14d RT 50% rel. h.)
Hardness Shore 00
(23°C; oven curing: 4hRT + 24h80°C)
Approx. 45
Approx. 45
Long-term temperature resistance
Short-term temperature resistance
Approx. 100°C
Approx. 140°C
Glass transition temperature (midset)
< -50°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. 0,10 N/mm2
Approx. 150%
Tear resistance
(W-specimen; incision; speed: 10 mm/min; 23°C)
Approx. 0,15 N/mm
Dielectric strength
> 30 kV/mm
Water absorption
After 28 days in water (immersion; 23°C)
Can not be determined by immersion test.
Water vapour permeability
(75% relative humidity; 23°C; 1 mm thickness)
Approx. 1,25×10-5 g/(Tag×mm2)
Storage and transport
Store in a dry and airtight closed container at 5 – 50°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 stir for 3 minutes evenly (avoid air bubbles). 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 mass, free of streaks and clear, 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.