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Thermal Fracture


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On dual pane windows with film applied, is it possible for a thermal fracture to occur on the interior pane and not the exterior pain? Also does a thermal fracture have to "fork" to be considered a thermal fracture or can it just be a single crack? Just curious as I have a customer requesting me to verify the below crack to see if it falls under the film manufacturer's warranty. I know it is ultimately up to the film manufacturer to make the decision, but I dont think it looks like a thermal fracture. One it is a very light film, no shading, and there is a shelf below the interior bottom pane where I noticed the customer had place objects on it and something could of fell over hitting the interior glass causing the crack, but we all know a customer isnt going to fess up it that is the case.

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It is possible that the glass had a chip or flaw of some sort on the edge, where you couldn't see it, that may have stressed the glass more after the film install...

Even with a lighter film, the absorption could have caused it to expand and contract more than it used to...

Also, those blinds look a little close to the window as well..

I am by no means a total expert on the subject, but if I had to guess, that would be my consensus... :thumb...

Good luck..

Let me know what you end up having to do... :thumb

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I've never had an external dual pane crack, (yet) had my share of internal ones though :thumb Most of them have been single line fractures like that one. In almost all cases it has been because of a nick or chip in the edge as shady pointed out. Blinds are close, when there closed they surely add to the stress on the glass

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straight out would not be considered "normal" for a thermal stress crack. Out an inch or so and then off at a sharp angle is what I have been told.....

Also never heard of it causing any problems on the outer pane....

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Guest Bulldog

Thermal fractures always "meander" throught the glass. Straight line cracks indicated a faw in the edge of the glass. After seeing your picture and the light film you applied, I would say no way the film caused it.

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Damn, they require you to send pictures of the crack? I have no doubt that the glass had a previous small crack and the film helped it along, but if it were me, I would tell the customer that you will replace the window. Then I would send in a claim to the manuf for the glass breakage warr to get reimbursed. Whether or not it is a result of the film doesnt matter to the customer, they want it fixed. They will feel all warm and fuzzy inside if you fix the problem without hesitation in a prompt manner, and you will have a customer for life. It will be problem that the customer will tell others about, but in a good way. :poke

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