Maximum Glass size

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jayjay

Grumbler in Training
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Sep 26, 2007
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Hi All,

Opinions please on whether 2mm Artglass UV99 1040mm x 1020mm too big to safely use in a sturdy frame with a 50mm window mat, giving it some support?
I read somewhere, 1000mm x 1000mm is the maximum size to safely use with 2mm? 🤷‍♀️

The item is a silk scarf. I want to avoid any issue with static acrylic glazing if possible.
The piece will be hung in my customer's rental holiday cottage so being a little cautious.

Many thanks.
 
If hanging in rental cottage, i would use acrylic because of safety and liability issues

You can do a direct contact overlay, where static helps keep it in place or use Optium acrylic from Truvue which is not static
 
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That is probably a question for the customer to ask his insurance agent. While we can point out potential liability, we really can't assess it.

Other mitigation factors would be just where in the cottage the piece is to be hung (high traffic area or above a piece of furniture where contact is less likely), and exactly how the piece is secured to the wall (we use a three point locking security hanger in rental units to reduce both liability and theft).

If the AR99 is on the low iron substrate, it is not only physically weaker than float glass (~2.5mm) because of relative thinness, but the reduced iron content makes the glass itself weaker.
 
From all the reading I've done and discussions here on the Grumble, acrylic is the preferred glazing for frames of this size, as well as preferred for silk. Conservation grade coating of course.
I tend not to use glass for anything over 32x40 inches, especially not 2mm glass. Far to easily broken.
Imagine the harm done to a silk scarf from sharp shards of glass!
 
Also, have you discussed with your client that silk does not like to be exposed to light for long periods.
Many suggest draping a cloth over the frame during the most intense periods of sunlight, and covering it if no-one is around to actually view it.
 
wpfay said:
If the AR99 is on the low iron substrate, it is not only physically weaker than float glass (~2.5mm) because of relative thinness, but the reduced iron content makes the glass itself weaker.
Click to expand...
Interesting, I never knew that about the low-iron glass. In any case, I rarely if ever use glass on anything larger than 36 x 48.
:cool: Rick
 
Anecdotally, I tend to have more issues with accidental breakage of 2.0mm than 2.5mm.
It makes sense, but who would think that .5mm would make much difference?
 
Glass is actually quite hard to break. However you have to ensure that there are no 'bumps' under the sight edge
which form stress points and the glass sits in the rabett 'comfortably'. Not too tight. If the glass is wedged in tightly
any knock to the edge of the frame will transfer to the glass and likely crack it. I'm perfectly fine with large pieces.
The glass must be cut cleanly. Any chips on the edge are cracks waiting to happen. 😉
 
Thank you all for taking the time to reply.

I have ordered 3mm Acryguard UV, which is what I originally recommended to my customer.
Better safe than sorry....
The smaller scarves I will glaze using Artglass UV99.
 
jayjay said:
Thank you all for taking the time to reply.

I have ordered 3mm Acryguard UV, which is what I originally recommended to my customer.
Better safe than sorry....
The smaller scarves I will glaze using Artglass UV99.
Click to expand...
I hope it is safe and not still sorry. 3mm is a bit thin for something over 1 sqm, it may not be flat, reflections could be wavy and at worst, it could bow and pop out of the rebate lip
 
Hi, jayjay. Do you know if the holiday cottage is temperature controlled?
 
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