Extended post cure and a higher crosslink density will probably first come to mind. Silicone type/grade and filler type/loading may also be influential. But set cannot be regarded in isolation. Other properties and the test environment have to be considered. More info would help.
TOTAL----------------------------264.100K
Catalyst is 2,4 Dichlorobenzoyl peroxide--1.5 %
If I need to change or replace any item please let me know.
Thanks
It is a heavily loaded material so its elastic properties are compromised anyway , but I think the addition of an acid acceptor like MgO (1.5phr) should help improve the efficiency of the Peroxide
Dear Johnnymat, thank you very much, heavy loaded is for high voltage resistance. so,please let me know either ATH or MgO is more suitable to achieve both high voltage and compression set?
I agree with Jonnymat. An acid acceptor would be useful, although a decent post cure should also get rid of acidic by-products. If for some reason post cure is not carried out, do ensure the cure time is equivalent to at least five half lives.
Curative absorption by silica may not be as pronounced as it can be in sulphur cured rubbers but adding triethanolamine or a more advanced silane agent may be worth trying. Cannot really appreciate why there is a very small level of fumed silica in addition to the main pptd type.
Thank you very much Stancom,Fumed silica is effective tensile strength,high voltage resistance, hardness and more transparency in silicone rubber.but because of the total cost there is limitation in use.
