Solving Problems with Chemicals


Dimethyl Silicone Compounds : Versatile Chemicals for Releasing, Lubricating and Sealing

 Dimetyl Silicone Compounds -- 3 Consistencies -- Numerous Applications

Polydimethyl silicone ( polydimethyl siloxane ) fluids are found to be chemically inert, non-corrosive, good thermal stability, lubricity, low odour and  low levels of toxicity. These outstanding properties make dimethyl silicone fluids the product of choice for many diverse applications --  the most versatile, cost-effective materials used for release agents, lubricants, polishes, paint and coating  additives.
The silicone fluids have a silicon-oxygen linkages resembling to that of  Si-O  found in high temperature resistant inorganic materials such as quartz, shown below:

Polydimethyl Siloxane

 This molecular backbone exhibits higher resistance to the attack of  oxidation, extreme temperature for extended period of time, chemical reaction compared to the carbon-carbon chain found in other organic compounds.

A  dimethyl silicone compound can be formulated by thickening polydimethyl silicone fluids  with inert amorphous silica filler to form a grease-like material.  The end product with specific consistency  can be utilised  for specific applications within industries.  Further to the inherent properties of  dimethyl silicone base fluids, dimethyl silicone compounds ( greases ) bear the features of:

* practically odourless
* showing extremely low level of volatility
* having resistance to broad range of chemicals
* moisture resistant
* good lubricating properties over long periods
* high dielectric strength
* resistant to oxidation
* good thermal stability
* excellent release and sealing properties

The term ‘Consistency ‘ describes the physical state of a particular grease ( or  compound ) which range from semi fluid – soft –hard – solid.  A  grease that is too hard / stiff may not feed into areas requiring satisfactory  lubrication, whereas  a grease that is too fluid may leak out from lubrication point . Grease consistency depends on the type and amount of thickener added and the viscosity of its base oil.

This may  be seen in Dow Corning Dimethyl Silicone Compounds which come in three different consistencies:

a. Light       - Dow Corning 7 Release Compound
b. Medium   - Dow Corning 4 Electrical Insulating Compound
c. Heavy      - Dow Corning 111 Valve Lubricant & Sealant

Dow Corning 7 Release Compound
* Mould release agent for foundry shell and core moulds
* Rubber lubricant
* Release agent for adhesive and glues
* Air frame lubricant
* Cable- pulling lubricant
* Release agent for plastic extruders and equipment
* Release agent for plastic film packaging machines ( eliminates built-up of plastic residue at sealing heaters ).

Dow Corning 4 Electrical Insulating Compound

Dow Corning 4 Electrical Insulating Compound
* Moisture- proof seal for aircraft, marine and automotive ignition systems and spark plug connections
* Water-proof electrical connections
* Seal and lubricant for battery terminals, rubber door seals, plastic and rubber o-ring
* Assembly lubricant

Dow Corning  111 Valve Lubricant and Sealant
* Sealant for vacuum and pressure systems
* Sealant for out-door equipment, meters, electrical service entrance and underground connections
* Chemical barrier coating
* Rubber and plastic O-ring lubricant
* Sealant for gaskets and seal
* Valve stem lubricant
* Aircraft vacuum systems

See also:

* Image of Silicone Lubricant
* Molykote Industrial Lubricants Catalog