Material

Kinshing engineer staff could guide customers to choose the suitable silicone material for their application, since customers sometimes are unknow the performance of the material, and which one is best for their application requirements.

As we work with a wide range of materials to produce silicone molded parts, in this way, we will help them successfully meet their needs.

Additionally, customers also can purchase prototypes made of different materials to test various products to determine which one is the best type.

Our prototypes are molded using custom (dedicated) metal tooling that is guaranteed for hundreds of parts and most tooling can run nearly any type of silicone and other materials without modification.

High Consistency Rubber (HCR) is the silicone rubber material that we mostly used.

Visit our Material Selection Guide to learn more about the prototype materials we use.

For specific information regarding material and application alternatives, we recommend visiting our technical information page or contacting us directly.

Silicone materials exhibit outstanding heat resistance and cold resistance, allowing them to endure long-term use in environments up to 180°C when exposed to air. By incorporating high-temperature additives into the material, there is significant potential to enhance its temperature resistance. Standard silicone rubber materials can achieve a lifespan of 20 years at 120°C and 5 years at 150°C.

HTV Silicone Rubber Data Table:

RTV Silicone Rubber Data Table:

Silicone Electrical Insulation

Silicone rubber boasts outstanding advantages in dielectric strength, power factor, and insulation performance, exhibiting minimal changes with temperature and frequency variations. Across a broad temperature range, dielectric strength remains essentially constant. Within a wide frequency range, the dielectric constant and dielectric loss tangent also remain nearly unchanged. Silicone rubber demonstrates excellent resistance to corona and arc discharge, with a corona resistance life approximately a thousand times that of polytetrafluoroethylene and an arc resistance life roughly 20 times that of fluoroelastomers.

Electrical properties of silicone rubber

est item	Result
Electrical strength（1/4in electrode， Rapid pressure extraction at 500V/s，sample thickness 1/16in,/(V/mil)	450~600
Relative dielectric constant	2.9~3.6
Dielectric loss factor	0.0005~0.2
Volume resistivity/ᾪ.cm	8×1013~2×1015
Insulation resistance/ᾪ	1×1012~1×1013

Silicone Chemical Resistance

Silicone rubber demonstrates excellent resistance to chemicals, solvents, and oils. Solvents primarily cause expansion and softening in silicone rubber, but once the solvent evaporates, most of the original properties of silicone rubber are restored. Silicone rubber exhibits good resistance to polar solvents such as ethanol, acetone, and edible oils, causing minimal swelling and maintaining virtually unchanged mechanical properties.

Silicone rubber also withstands the effects of low concentrations of acids, bases, and salts. For instance, when immersed in 10% sulfuric acid at room temperature for 7 days, the volume and weight changes are both less than 1%, with minimal impact on mechanical properties. However, it is not resistant to concentrated sulfuric acid, strong alkalis, and non-polar solvents such as carbon tetrachloride and toluene.

Silicone rubber excels in properties like oxygen resistance, ozone resistance, and resistance to UV radiation. Therefore, it does not experience cracking when used outdoors for extended periods. It is generally believed that silicone rubber can be used outdoors for over 20 years.