New Mold Release agent

[rxcomposite]

I should have said "it was discovered in the early days of composite". And it was during that time that salesperson were still harping on the superiority of silicon based mold release and multi release agent, not knowing that it is common knowledge amongst composite manufacturers to steer clear of silicon based release agent. One was even claiming that the "cured" silicon rubber mold does not exhibit silicon migration on the ground that it is cured. Rubber mold was used as a caul plate for parts that require well defined corners or relatively flat surfaces.

Not until this "new" product shows a report that it does not exhibit silicon migration, I will be wary.

We were just careful then (even now). After all we were making aircraft composite parts and the quality control in place was very strict.

[tunnels]

Had a look up on there website and did some reading so check it out first
http://www.chemtrend.com/application...elease_systems

[rxcomposite]

Here's more on mold release covering several brands. Note that "There is no universal best mold release," and they make distinction on silicon based product.

PVA or Partall is still the best insurance for contaminated/uncured/unbroken in mold.

http://www.compositesworld.com/artic...release-update

[Fgayford]

Thanks for the history.
I have contacted the manufacturer stating the silicone concerns. I will post the reply.
Fred

Originally Posted by rxcomposite

I should have said "it was discovered in the early days of composite". And it was during that time that salesperson were still harping on the superiority of silicon based mold release and multi release agent, not knowing that it is common knowledge amongst composite manufacturers to steer clear of silicon based release agent. One was even claiming that the "cured" silicon rubber mold does not exhibit silicon migration on the ground that it is cured. Rubber mold was used as a caul plate for parts that require well defined corners or relatively flat surfaces.

Not until this "new" product shows a report that it does not exhibit silicon migration, I will be wary.

We were just careful then (even now). After all we were making aircraft composite parts and the quality control in place was very strict.

[Fgayford]

I did talk to their company rep about silicone in the product. He said that in the early days silicone migration to the part was a problem. Chemlease has the silicone suspended in a resin that once cured to the mold surface has absolutely no transfer to the parts being made. He is aware of the rumours floating around about silicone contamination. With this product it is not so.
I am relieved to get this information. It works so well.
Fred