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Why does heat cause glass to crack?

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Posted by: chandra2 at Thu Jan 31 08:01:48 2013  [ Report Abuse ] [ Email Message ] [ Show All Posts by chandra2 ]  
   

I need to heat some glass vivs.I use flexwatt along the back but its not enough(set around 90 degrees).Because they are for arboreals with high humidity needs I dont have screen tops.I wanted to just add some heat by having a bulb on during the day.

Can I hang a light above the glass a few inches and not have the glass crack.Could I use a low wattage bulb in a fixture sitting directly on the glass?

I only need to get the ambient air temps up about 10 degrees without drying out the tanks.



What exactly causes cracking? Is it the high heat or the fluctuations or what?



I could always just buy more flexwatt and run a longer strip, would that help get the temps up?

BTW I already have three sides of each tank insulated.These are 40 gals set upright.

   

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>> Next Message:  RE: Why does heat cause glass to crack? - markg, Fri Feb 1 20:45:52 2013
>> Next Message:  RE: Why does heat cause glass to crack? - Craigo, Thu Feb 7 17:54:11 2013

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