Erosion-resistant and hydrophobic protection for high-voltage isolators
SÄKA-Silicone Grease 81 is recommend for highly contaminated areas to protect insulator surfaces
from arking and its consequent failures. A layer thickness of approx. 0.3 mm is guaranteeing
protection for a long time.
SÄKA-Silicone Grease 81, developed in long-termed tests, is a tranparent, poisonless substance of
unctuous consistence on basis of pure methylpolysiloxane of definite viscosity with little quantities of
inorganic thickeners. SÄKA-Silicone Grease 81 has good behaviour properties, that means
permanent layer thickness.
SÄKA-Silicone Grease 81 is resistant to temperatures from -40°C up to +200°C, and there is no
relevant change in consistency.
SÄKA-Silicone Grease 81 is strong hydrophobic, insoluble in water and will not be changed by hot
vapour. Metals, plastic, glass and ceramics are not attacked.
SÄKA-Silicone Grease 81 is physiologically unobjectionable.
SAEKAPHEN Silicone Grease 81750 is supplied in 750g tubes suitable for industrial application.
Characteristics:
Density at 20° C: approx. 1g/cm³
Flashpoint: > 300° C
Melting point: up to 220° C no melting point (but in case of more than 220° C: beginning of decomposition)
Acid number: approx. 0.5
Dielectric constant ε?: approx. 3.0 at approx. 50 Hz and 20° C
Specific resistance: δ 20° C = 1015 =/cm
Dielectric loss factor tan δ at 20° C: below 0.002
Breakdown voltage at 50 Hz and 20° C: approx. 100KV / cm
Ash percentage: 33 %
Solidification point: approx. -40° C
Loss in weight after 30 hours at 200° C: below 3 %
Technical data