Addition cure silicone rubber mould sticking


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Ray Rogers
Ray Rogers
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Hi!
Over the winter months I used an addition cure silicone mould 20 times or so to pour tinted water clear polyurethane casting resin into with good success. Last night I used the same material again but tonight the casting was really, really stuck in the mould to the extent I damaged the mould whilst trying to de-mould.
Any suggestions as to what went wrong and what I can do to prevent this again please?
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Warren (Staff)
Warren (Staff)
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With 20 pulls or so, the Mould itself may be wearing out and the surface may have become slightly damaged and hence the sticking.  You can extend the life a little by using some pure silicone oil after each pull to restore any oils that dry out of the silicone.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant
Ray Rogers
Ray Rogers
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Warren
Thank you for the information, seems strange that say pull number 20 was ok and number 21 was impossible to remove from the mould. I wondered if there was a possible change in the mould over the months it stood, perhaps 'drying' or contamination from dust etc.
Is silicone oil something you supply please?
Regards
GO

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