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Post by permaculturebob on Dec 8, 2018 17:07:04 GMT -8
what about all the glass cooktops like Matt uses? I have one now, and the hottest flames are all over it.
does that mean it will one day break, or simply discolor?
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Post by wiscojames on Dec 8, 2018 17:39:04 GMT -8
When I tap on either side of mine, they both sound more like plastic than glass. One sure way to find out is to throw a pile of them in to your bonfire pit. Let us know! The funny thing is, that's what modern stove window glass sounds like when you tap it ... For what its worth, the pieces that I've been using (schott robax) look about the thickness of the piece vortex is holding above, and sound like a thick piece of glass, and very unlike my microwave's door. |
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Post by Vortex on Dec 9, 2018 2:27:39 GMT -8
what about all the glass cooktops like Matt uses? I have one now, and the hottest flames are all over it. does that mean it will one day break, or simply discolor?
They don't seem to break, the surface becomes opaque and feels rough to the touch. I think it's spalling on a tiny scale. Only becomes a problem if you want to see through it clearly. I was just surprised how fast it happens. |
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Post by permaculturebob on Dec 9, 2018 5:16:34 GMT -8
what about all the glass cooktops like Matt uses? I have one now, and the hottest flames are all over it. does that mean it will one day break, or simply discolor?
They don't seem to break, the surface becomes opaque and feels rough to the touch. I think it's spalling on a tiny scale. Only becomes a problem if you want to see through it clearly. I was just surprised how fast it happens. can it be polished back to clarity?
Would sodium silicate solution applied periodically help protect the glass itself as a preventive, or possibly applied over the spalling to improve visibility?
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serg247
Junior Member
The mountain can not be conquered, it can allow it to ascend...
Posts: 111 
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Post by serg247 on Dec 9, 2018 5:33:41 GMT -8
For observation, it is better to use two glasses. This will reduce the temperature difference between the sides of the glass.
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Post by Vortex on Dec 9, 2018 7:08:05 GMT -8
I was wondering about that. I was thinking of trying to make a double-glazed one using fire-rope as the spacer, and the high temp aluminium stovepipe sealing tape around the edges. can it be polished back to clarity? Would sodium silicate solution applied periodically help protect the glass itself as a preventive, or possibly applied over the spalling to improve visibility?
Never thought of trying to polish out the spalling... That's a good idea. |
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Post by matthewwalker on Dec 9, 2018 15:58:51 GMT -8
I suspect a double glazed window would drive the inner window past working temps. Just guessing though.
The ceramic glass cook tops I use hold up, they are not clear though and are already roughed up on the inside. The clear windows in my cook stoves do get etched over time, but don't seem to weaken. The do become opaque over time though.
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Post by gadget on Dec 9, 2018 20:40:21 GMT -8
anyone using an air wash on their door glass notice if it helps with the erosion?
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Post by peterberg on Dec 10, 2018 6:17:34 GMT -8
No erosion on my door glass, stays completely transparent. It does stain a bit over time though, like a grey veil. I clean it with a dry piece of paper once in three weeks or so. During testing phase in season 2015/2016 it blackened a couple of times a week quite bad but since the design of secondary air supply has been finalized problems are over.
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Post by Vortex on Dec 10, 2018 11:43:44 GMT -8
It only seems to occur where the glass is in regular direct contact with high temperature flame. The neoceram is better at resisting it than the old pyroceram, but still only takes a few weeks use on the top of a DSR type setup to get etched.
Not going to be a problem on a batchbox door. There's none on my new stove door glass after a season of use. My old door glass showed a little at the bottom above the primary air port after 5 years of use, but it would flare up behind the port there on lighting and flame would touch the glass quite often.
I use a wet-wipe to clean the fine white ash off the inside of the stove door glass about once a week.
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Post by peterberg on Dec 10, 2018 12:05:37 GMT -8
It only seems to occur where the glass is in regular direct contact with high temperature flame. The neoceram is better at resisting it than the old pyroceram, but still only takes a few weeks use on the top of a DSR type setup to get etched. Right, I am not surprised. In October 2017 in Montana at Paul Wheaton's place several people kept the second experimental model of the DSR (with the clear glass top) going at full throttle for at least 18 hours. By that time, the then new pieces of neoceram started to get opaque. Not much, but at the time of dismantling it was clearly visable. |
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Post by ronyon on Jan 6, 2019 4:06:47 GMT -8
I'll just ask this here, it's as good a place as any.
Could an all glass wood burner be viable?
A cube made of stovetops is the image that comes to mind, but anything goes of course.
Steel,cob or refractory cement edges/corners glass for every flat surface.
I think Matt did some work like this, early on, in cob.
Clearly(pun intended) any wood burner that runs best when part or all of it are insulative, would suffer in performance.
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Post by Vortex on Jan 11, 2019 2:03:21 GMT -8
Yesterday I went to the place where I've always bought my stove glass. I talked to the manager and showed him the surface damage I'm getting. In the conversation it came out that it's actually Schott Robax not Neoceram. It seems they used to sell the Neoceram, but changed over and it was just an old habit referring to it as that.
I couldn't find anywhere in Ireland actually selling Neoceram, so wrote to the UK distributor. I showed him the video of the stove and the picture of the damage to the surface of the glass. They're going to send me some samples to trial, but he said it's possible that the heat is just too intense in my design for the surface of the glass to cope with.
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Post by johnjorgensen on Jan 26, 2019 8:33:47 GMT -8
Has any of you tried using the glass plate off a microwave oven? When these cheap windows break, are there any risk of them "exploding" out in the room?
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Post by Vortex on Jan 26, 2019 10:18:37 GMT -8
Yes it can explode. Microwave door glass suppliers list them as toughened or tempered glass. Whereas the trays inside that spin around are listed as borosilicate. |
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