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Old 09-21-2018, 12:10 PM
Chris Lowry Chris Lowry is offline
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Hxtal

So is hxtal good with glass to steel?
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Old 09-21-2018, 12:30 PM
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I have never bonded glass to steel but I have done hxtal to aluminum on a number of occasions. Once, I dropped a piece bonded like that and it indeed broke but the piece did not break at the joint, it broke up about an inch from it.
Just have the surface clean and try to make the joint right around 100F. It will need clean up with acetone at about 24 hours. Wait longer at your own peril.
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Old 09-21-2018, 12:49 PM
Chris Lowry Chris Lowry is offline
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I was thinking stainless but aluminum might work. I guess Iíll do a test.
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Old 09-21-2018, 01:13 PM
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the point there was that the glass was not as strong as the hxtal joint.
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Old 09-21-2018, 01:50 PM
Eben Horton Eben Horton is offline
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I think that the only time you would have to worry is with quick temp changes related to being outside. If the work is going inside it should be totally fine. The COE of steel is much much less than soda lime glass.
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Old 09-21-2018, 02:02 PM
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I failed to mention that the piece had been out in the weather in winter colorado.
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Old 09-21-2018, 02:06 PM
Art Freas Art Freas is offline
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Is there a reference anywhere that would give the rough linear expansion of glass to steel, aluminum, .....
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Old 09-21-2018, 02:39 PM
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Here's one.

Don't know how precise it is, or helpful.
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Old 09-21-2018, 02:51 PM
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It shows plate glass around 3.3, steel at 7.5 and aluminum at about 13. I think the issue is over what distance and standard is applied. Aluminum is clearly the highest value. Much would depend on the area being covered .

In glass, the ASTM standard is expanding from 19.1C to 300C over a 4.000 inch test rod. So, you can do that math. If the joint was 2 inches in our soft glass, it would be 96/2 ten thousandths. You would want to take into account the fact that the steel is expanding as well to determine what kind of strain to expect. My non scientific observation with aluminum ( expanding at twice the steel specs) did not cause fracture at the joint. What usually actually is important in stuff like this is surface preparation and that is inevitably where joint failure occurs and I have seen it more times than I can count in glass on glass even with the same formulation. I have never seen a hxtal joint fail in the same way as I've seen UV adhesives fail. In UV, sometimes the joint simply peels away.

Don't use windex. Don't use 70% isopropyl. Pure Xylene in a 90% isopropyl solution gives some tooth to the venture. Don't breathe the xylene.
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Old 09-21-2018, 06:04 PM
Peter Bowles Peter Bowles is offline
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I've always thought the units of expansion bizarrely funny.
Perhaps they were made by a delegation of Liberians, Americans, Germans and Indians at a scientific conference in Myanmar.
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