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Even after vacuuming, once the resin is poured into the mould it can extract air from the mould itself, particularly as the temperature rises as it starts to cure (the exotherm increases).
We would always suggest that the way to avoid this is to preheat the mould for 1-2hours at 40-50 degrees C. -
In thinner sections, they can be brittle: this would generally be the result of poor mixing or wrong ratio. This can be counteracted to some degree by post curing, which will improve the properties -
Most need to be used at room temp)25 degrees C),
but there are some that require an elevated temperature for curing. -
There are several criteria you can sort by:
Thin/thick section casting Quick setting Filled resins Water white/clear castings Heat resistance High impact resistance Thermoplastic appearance Room temperature curing -
