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.