Casting help!

[TSum]

Hello all. I've been casting for about 9 months with a few hiccups. I'm having an issue now and I can't figure it out. I'm casting label blanks in alumilite under pressure. I've done this plenty of times with no issue but now my blanks have several tiny white particles floating in them. Does anyone know what this is??

 

[MrResinBlanks]

I had similar with some resin when I didn't warm the parts before mixing. The resin crystallized and that caused my issue. Since warming not had a problem

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[JohnU]

A few things to look at... how old is the alumilite, is it crusted around the cap and falling in the cup when pouring, are there any particles in the pressure tank or fittings that might be blowing around when inflated, and like said above, warm the resin for an easier and better mixing process. Hope you find your solution.