Silicone Rubber (VMQ / SILCONE)

Silicone Rubber (MQ,VMQ,PVMQ)

Physically,silicones are based on silicon,an element derived from quartz.To create this class of synthetic elastomers,pendant organic groups such as methyl,phenyl and xinyl are attached to silicon atoms.The different addition pf side chains can achieve significant cariations in properties.Siliconer have excenllent heat,ozone and corona resistance,very well dielectric stability,and resistance to many oils,chemicals,and solvents.And for all elastomers,silicones possess the best flexible property at low temperature.But it also has some wekness like low tensile strength,poor tear and wear resistance

Cure system-Peroxide-Cured vs.Platinum-Cured

Standard silicone compounds are usually peroxide-cured.Platinumcured compounds offer better flexible properties and very low volatile matter.Platinum-cured silicones usually are applied in medical system or other required low volatile matter,but they need to be produced in clean room and higher cost of platinum catalyzer so they are more expensive than peroxide0-cured ones.

Other Common Variations

●Silicones can be formulated with only”white list”ingredients as specified in 21.CFR 177.2600 for use in applications where the elastomer will be in contacr with food or beverages

●Silicones can be submitted for approval by the National Sanitantion Foundation(NSF)for use in drinking water applications.

●Silicones are usually used in automotive system like boots,oil filter valve,gasket in light…etc

●Silicone parts can be used in medical system which especially require compliance to USP CLASS VI.

Performs Well In…

●Engine and transmission oil(mineral oils)

●Diluted salt solution

●Moderate water

●Dry heat

●Ozone,weather resistance

Doesnt Perform Well In…

●Concentrated acids and alkalis

●Steam over 120℃

●Petroleum oils and fuel

●Ketones

General Information

ASTM D1418 Designation

Q,MQ,VMQ,PVMQ

ISO/DIN1629 Designation

Q,MQ,VMQ,PVMQ

ASTM D200/SAE J 200 Codes

FC,FE,GE

Standard Color(S)

Rust

Hardness Range

25 to 90 Shore A/li>

Relative Cost

Medium High

Service Temperatures

Standard Low Temperature

—60℃
—76℉

Standard high Temperature

225℃
437℉

Special Compound Low Temperature

—100℃
—150℉

Special Compound High Temperature

300℃
572℉