This is a hot-button topic in the industry. The presence of fabricating debris on low-quality tempered glass creates all kinds of issues for window cleaners. But the simple fact is, FD is a reality and it’s not going to change any time soon.
So then, what can we do to minimize our risk… more
Caleb is correct in saying if there’s fabricating debris, it will be on the roller side.
But what Caleb says about running a scraper over a sandblasted stamp is incorrect.
A porcelain stamp sits upon the surface and could be felt with a scraper.
But a sandblasted stamp is recessed and cannot be felt.
If you ran a scraper over a tempering mark and could NOT hear anything, it may be a quality roller side - but it’s NOT a porcelain stamp.
If you’re unsure, take the corner of the scraper and try to feel whether the mark is pitted (which means it is sandblasted.)
The simplest explanation for how to determine the type of stamp is found on Dan Fields’ site.
[URL=“http://www.thefieldsco.com/index.php?page=glass-quality”]Here is the best way
"The best way to determine the type of stamp is by passing a razor blade over it. If the blade passes over the stamp without any drag it is a sand blasted stamp. Otherwise, the stamp is a porcelain stamp. "
whoops, got them backward. you are correct gary, thanks for the catch. i’ll adjust the article so it’s right.
You can also see if it says old castle and then you know not to use a scraper at all
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A company like that - with dozens of furnaces in the US alone - you really don’t know.
What you know is, the roller side is where the problem is - IF it exists.
