Eta Huinya
New Member
Hey all, a couple questions for the purge/vac shatter makers. As the header says, my first question is about purging temperatures. My desired end product is shatter with as few residual solvents as possible. I was originally taught that 90 deg F was the ideal purge temp for this, but during my research for a new heat source I have found many people who purge at temps of anywhere from 90-115 deg F. what is the optimal temp for creating shatter that I can get down to less than 100 ppm residual solvents?
The second question stems from the first, and that is what have you found to be a good, stable low temp heat source to maintain that temp? I would love to be able to afford a vac oven but cannot, my current budget is around $100-150. My purge chamber is a 12" aluminum pot, my vac is one of the more powerful ones. In the past I was taught using a waterbed heating pad; great for low heat but terrible heat variance and stability. I couldn't purge more than 8 hours without edges beginning to turn waxy/buttery, with residuals being around 500 ppm.
My first thought is a silicone heating mat such as sold by brisk heat, but prices are above my current budget. They are similar in many ways to what I'm used to, but are they any good? I like the 50-150 deg F temp range but uncertain about temp stability and control, anyone with input?
I'm considering making a poor man's heat source with a griddle and rice/sand bath to get me through, but if I do any advice for which griddle works best for achieving and maintaining purge temps? I would like to get chamber down to 80 or less if possible just for some working room on the low end.
The second question stems from the first, and that is what have you found to be a good, stable low temp heat source to maintain that temp? I would love to be able to afford a vac oven but cannot, my current budget is around $100-150. My purge chamber is a 12" aluminum pot, my vac is one of the more powerful ones. In the past I was taught using a waterbed heating pad; great for low heat but terrible heat variance and stability. I couldn't purge more than 8 hours without edges beginning to turn waxy/buttery, with residuals being around 500 ppm.
My first thought is a silicone heating mat such as sold by brisk heat, but prices are above my current budget. They are similar in many ways to what I'm used to, but are they any good? I like the 50-150 deg F temp range but uncertain about temp stability and control, anyone with input?
I'm considering making a poor man's heat source with a griddle and rice/sand bath to get me through, but if I do any advice for which griddle works best for achieving and maintaining purge temps? I would like to get chamber down to 80 or less if possible just for some working room on the low end.
