SILICONE GREASE

High Vacuum Grease(H.V.G.) possesses a number of charateristics. Its vaseline-like consistency remains almost unchanged over a wide range of termperature and remains paste like even at temperatures below 50 C. It withstands long term exposure to temperatures of upto 230 C. It has little tendency to bleed, even at high temperatures, with practically no oil separation even after prolonged periods. It is thixotropic, i.e. it becomes slightly thinner when subjected to mechanical stress, such as stirring, reverting to their original consistency after prolonged standing.

H.V.G. is strongly water repellant. It is not attacked by vegetable oils, mineral oils, dilute acids and alkalis, nor by most aqueous solutions. It does not cause swelling when in contact with plastics.

H.V.G. resists radiation and is flame resistant. It is non-toxic and physiologically inert. It does not encourage mould growth and can therefore be used safely under humid conditions.

H.V.G. has excellent dielectric properties e.g. high dielectric strength, low loss factor even at atmospheric humidity & arc resistance.

H.V.G. has been used successfully as release agent in plastics and rubber moulding, as lubricant, water repellants, encapsulating compounds and damping media as well as sealant and electrical insulating materials.

Although High Vacuum Grease is not, in fact, true bearing lubricant, it is nevertheless used as high and low temperature lubricant, for certain bearing combinations such as metal/plastic, metal/rubber and plastic/plastic, on account of their good antifrictional properties.

H.V.G. is specially formulated grease for use as vacuum grease and for sealing glass apparatus joints.

Applications:

H.V.G. has given good service as a viscous lubricant for stop corks, ground glass joints and valves and is ideally suited for sealing glass apparatus. The grease will not run even at high temperatures and, because it is slightly sticky, shows good adhesion to a variety of surfaces. Its heat and oxidation resistance is coupled with insolubility in numerous solvents such as acetone, glycol, glycerin, methyl and ethyl alcohol and water.