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[Cob] vermiculite, pumice, perlite suppliers?Shannon C. Dealy dealy at deatech.com
Thu Sep 22 07:34:33 PDT 2005
On Thu, 22 Sep 2005, Amanda Peck wrote: > What's the difference between masonry grade and gardening grade, (which might > not be available in the gardening sections of the stores, but rather through > greenhouse or professional garden suppliers)? > ...................... > > Shannon wrote (snipped into nothingness) > masonery grade perlite Horticultural grade perlite is open celled in order to absorb and retain water for propagating plants, masonery grade is closed cell for use as insulation. If you use horticultural grade for a stove (as I once did years ago), it will suck up tremendous amounts of water when you are trying to mix it with your clay slip (if you don't use lots of water you won't be able to get the clay slip to coat it), and it will take forever to dry out, during which time your stove won't be working as well as it should (after 50 hours of almost continuous running on my stove at the time, a large percentage of the perlite was still wet, though I was running a thicker insulation layer than normal). Don't use horticultural grade perlite! Shannon C. Dealy | DeaTech Research Inc. dealy at deatech.com | - Custom Software Development - | Embedded Systems, Real-time, Device Drivers Phone: (800) 467-5820 | Networking, Scientific & Engineering Applications or: (541) 929-4089 | www.deatech.com
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