Member Discussion Forum

Description

Topics regarding quality of glass, its processing and its application in building. 

Setting Blocks for Glass

I am installing an internal window in our house 130cm x 86cm. As it is above the stairs it is complying to Building Fire Regs. I have made the frame and beading from hardwood, as per spec, and sourced the correct glass. However the specs state that 5mm hardwood setting blocks are used. What is a setting block and what is the purpose of them? I am guessing that the glass will sit on it but why? Also would I create setting blocks for the full perimeter of the glass or is it just for the bottom of the glass? Any help would be appreciated

Ceramic Roller Problems - Horizontal Tempering

We are running across a large scale problem with brown clumps accumulating on our fused silica rollers in our horizontal tempering furnace. We have cleaned out our SO2 manifold and even swapped tanks - any ideas on what else to try?
The brown clumps are accululating sparatically across the entire roller hearth in odd corkscrew patterns, with the largest accululation in the last zone. I have pictures for those interested in helping me solve this problem.