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#16
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OT; glass top tables shattering
http://www.alumaxbath.com/tech/tgb.htm
On 29/01/2010 10:30 AM, Rod Speed wrote: Jonno wrote It can happen that the glass is only esposed to the suns heat leading to the metal restricting it and it cracking,, shattering etc. Thats not even possible with a frame. If both are exposed at the same rate that would be true..Like air temperature by itself. Its even more true of the sun where you cant stop the metal frame being exposed to the sun with a glass topped table. Its MUCH more likely to actually be a problem with the glass itself, and we do see the same problem with stuff like oven doors etc, the cheap shit from china having a real tendency to explode. Thats actually due to the glass they are made from, not the mounting. On 29/01/2010 8:55 AM, Rod Speed wrote: Jonno wrote If the glass is constricted by a metal frame, the expansion of the glass, and slower rate of expansion of metal In fact metal has a higher coefficient of expansion than glass. http://en.wikipedia.org/wiki/Coeffic...ious_materials could cause pressure to build up in the frame, with the resultant breakage, That wasnt in fact seen with the old style steel framed windows that you dont see much of anymore. Thats why a properly designed table will have rubber expansion sealing material on the outside of the frame... Dunno, are they in fact mostly framed at all ? Rod Speed wrote 0tterbot wrote wrote This one got full sun each day, to charge the glowing frog/etc garden lights {:-), so there would have been some expansion movement. glass doesn't like the sun!!! this is probably the origin of the problem. Unlikely, I have 13 8'x8' patio doors, 7 of them on the north side of the house. I dont have any conventional windows except in the bathrooms, the bedrooms have one or two patio doors. The ones on the north side get sun every sunny day and not one of them has ever broken. dh is a brewer so naturally we scab crown-top bottles from anywhere& anyone. however, you can't always tell if they've been left in the sun too long,& very occasionally, they just explode on a hot day or after some minor contact with something. which is unfortunate if they happen to be full of beer at the time. if we know a bottle has been in the sun, best just not to use it. (same with tables, i suppose). Nope, fraid not, most obviously with windows. -- |
#17
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OT; glass top tables shattering
Jonno wrote:
Not even possible with the frame partly exposed? Nope, because the top is glass so the sun will shine thru that, even if its translucent etc. Its also possible if the sun shines thru the glass first. Nope. Theres many variations I even heard of glass cracking due to a flag pole putting a shadow on the window, causing uneven heating. Dont believe it. You dont get that effect with windows and patio doors. The temperature was on the lower side in Canada. You dont get that effect with windows and patio doors even in Canada. As far as poor quality glass goes, that's possible, but unlikely with modern methods of making glass. Have fun explaining the rash of that with oven doors and alleged pyrex food things which arent. Damaged glass is usually the problem when the article is made. Not with china. Its trivial to prove that the problem was the glass itself, its trivial to work out what sort of glass it was. Then the other things like bad handling, temperature cause the glass to shatter.... How odd that you dont get it with windows and patio doors. On 29/01/2010 10:30 AM, Rod Speed wrote: Jonno wrote It can happen that the glass is only esposed to the suns heat leading to the metal restricting it and it cracking,, shattering etc. Thats not even possible with a frame. If both are exposed at the same rate that would be true..Like air temperature by itself. Its even more true of the sun where you cant stop the metal frame being exposed to the sun with a glass topped table. Its MUCH more likely to actually be a problem with the glass itself, and we do see the same problem with stuff like oven doors etc, the cheap shit from china having a real tendency to explode. Thats actually due to the glass they are made from, not the mounting. Bakers warn that you should place a towel over the oven window when pulling anything with moisture out of a hot oven. A little bit of moisture on very hot glass can cause the window to shatter. On 29/01/2010 8:55 AM, Rod Speed wrote: Jonno wrote If the glass is constricted by a metal frame, the expansion of the glass, and slower rate of expansion of metal In fact metal has a higher coefficient of expansion than glass. http://en.wikipedia.org/wiki/Coeffic...ious_materials could cause pressure to build up in the frame, with the resultant breakage, That wasnt in fact seen with the old style steel framed windows that you dont see much of anymore. Thats why a properly designed table will have rubber expansion sealing material on the outside of the frame... Dunno, are they in fact mostly framed at all ? Rod Speed wrote 0tterbot wrote wrote This one got full sun each day, to charge the glowing frog/etc garden lights {:-), so there would have been some expansion movement. glass doesn't like the sun!!! this is probably the origin of the problem. Unlikely, I have 13 8'x8' patio doors, 7 of them on the north side of the house. I dont have any conventional windows except in the bathrooms, the bedrooms have one or two patio doors. The ones on the north side get sun every sunny day and not one of them has ever broken. dh is a brewer so naturally we scab crown-top bottles from anywhere& anyone. however, you can't always tell if they've been left in the sun too long,& very occasionally, they just explode on a hot day or after some minor contact with something. which is unfortunate if they happen to be full of beer at the time. if we know a bottle has been in the sun, best just not to use it. (same with tables, i suppose). Nope, fraid not, most obviously with windows. |
#18
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OT; glass top tables shattering
Jonno wrote:
http://www.alumaxbath.com/tech/tgb.htm Nice theory, pity you dont get any sunlight effect with patio doors which by law have to be tempered glass. On 29/01/2010 10:30 AM, Rod Speed wrote: Jonno wrote It can happen that the glass is only esposed to the suns heat leading to the metal restricting it and it cracking,, shattering etc. Thats not even possible with a frame. If both are exposed at the same rate that would be true..Like air temperature by itself. Its even more true of the sun where you cant stop the metal frame being exposed to the sun with a glass topped table. Its MUCH more likely to actually be a problem with the glass itself, and we do see the same problem with stuff like oven doors etc, the cheap shit from china having a real tendency to explode. Thats actually due to the glass they are made from, not the mounting. On 29/01/2010 8:55 AM, Rod Speed wrote: Jonno wrote If the glass is constricted by a metal frame, the expansion of the glass, and slower rate of expansion of metal In fact metal has a higher coefficient of expansion than glass. http://en.wikipedia.org/wiki/Coeffic...ious_materials could cause pressure to build up in the frame, with the resultant breakage, That wasnt in fact seen with the old style steel framed windows that you dont see much of anymore. Thats why a properly designed table will have rubber expansion sealing material on the outside of the frame... Dunno, are they in fact mostly framed at all ? Rod Speed wrote 0tterbot wrote wrote This one got full sun each day, to charge the glowing frog/etc garden lights {:-), so there would have been some expansion movement. glass doesn't like the sun!!! this is probably the origin of the problem. Unlikely, I have 13 8'x8' patio doors, 7 of them on the north side of the house. I dont have any conventional windows except in the bathrooms, the bedrooms have one or two patio doors. The ones on the north side get sun every sunny day and not one of them has ever broken. dh is a brewer so naturally we scab crown-top bottles from anywhere& anyone. however, you can't always tell if they've been left in the sun too long,& very occasionally, they just explode on a hot day or after some minor contact with something. which is unfortunate if they happen to be full of beer at the time. if we know a bottle has been in the sun, best just not to use it. (same with tables, i suppose). Nope, fraid not, most obviously with windows. |
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