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Hi Ray,
Thanks for the post, this is a very interesting problem to be because I was not aware that our yellow wax could inhibit the cure of the Addition Cure Silicone Rubber although it sounds like it could be the case from what you're describing. I have used the wax in conjunction with the Addition Cure Silicone Rubber myself but it's only ever been very small quantities of the wax which I've used to help secure polypropylene sheet sidewalls down onto the baseboard so I guess the interaction between the wax and the silicone would be minimal and perhaps wasn't enough for cure inhibition to occur. I will get into the lab this morning and conduct a test in two sample trays, one with a yellow wax filling the base and the other without. This will re-create your conditions. It will take around 12hrs to get a definitive answer which if necessary we'll use to update our technical information.
If the wax is the problem then I would think clay would make a good alternative. There's nothing on the TDS for the silicone to suggest that clay would inhibit cure but we do know that just about any material with a high sulphur content will inhibit addition cure silicone so I would strongly recommend conducting a small test, much like the one I described above that I'll be doing on the wax.
I'll keep updating this thread as answers develop.
Best regards, Matt
Matt Statham Easy Composites / Carbon Mods - Technical Sales
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