Submitted by Bryan Dillon on Thu, 04/02/2009 - 3:10pm
I was wondering if someone could help me understand why post curing silicone improves compression set. I understand that low MW oils are driven off, but I don’t understand why that helps with compression set.
Submitted by M Lefave on Mon, 11/16/2009 - 6:53pm.
Type will vary on results. The three usually used Addition by platinum, by Peroxide and by condensation.
In almost every case silicones by nature need to be highly reinforced. The higher the surface area of a filler generally will result in high resistance to compression.
Post cure drives oils interfering with filler polymer attachment.
The last item is obscure but most silicone elastomers slow down the crosslinking near the edge of claimed cure time. In reality the ability to cure as you approach the last 1-5 percent of total cure is poor. It never will happen unless it sees a driving force such as heat.
Comments
I've been wondering the same
I've been wondering the same thing. No one here who is a silicone molding genius can explain this to us? Thanks!
silicone post curing
Type will vary on results. The three usually used Addition by platinum, by Peroxide and by condensation.
In almost every case silicones by nature need to be highly reinforced. The higher the surface area of a filler generally will result in high resistance to compression.
Post cure drives oils interfering with filler polymer attachment.
The last item is obscure but most silicone elastomers slow down the crosslinking near the edge of claimed cure time. In reality the ability to cure as you approach the last 1-5 percent of total cure is poor. It never will happen unless it sees a driving force such as heat.