GardenBanter.co.uk - View Single Post

Jonno[_22_] · 28-01-2010, 11:54 PM posted to aus.gardens

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.

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