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Toughened glass

Hand Lettering topics: Sign Making, Design, Fabrication, Letterheads, Sign Books.

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DAVE SMITH
Posts: 1213
Joined: Sat Jul 10, 2004 11:12 am
Location: ENGLAND

Toughened glass

Post by DAVE SMITH »

Hi Everyone. I have a question concerning the black two part epoxy nazdar paint ADE 52. I’m painting this two part ink directly onto toughened glass ( I think it's known as tempered in the States) I am wondering if this is a problem for adhesion and strength? Would it be the same as painting directly to float glass? I normally jitter bug the surface of the glass with cerium to give some key for the paint, would it still be possible with toughened glass? I personally can't see any difference but still good to put the question out with you people.


thanks
Dave
Larry White
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Joined: Thu Apr 08, 2004 4:18 am

Re: Toughened glass

Post by Larry White »

Nah.... you won't see any difference in the way "toughened" glass acts as opposed to regular annealed float glass. Although you can't depth carve it, and a resulting glue chip pattern is less desireable than what you'd get on float glass.

-WB
Larry White
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pat mackle
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Re: Toughened glass

Post by pat mackle »

I agree with Larry. However "toughened glass" can mean glass that has been heat strengthened/toughened or chemically strengthened, NOT fully "tempered" as in the tempered glass that breaks into small grains. Toughened glass may take a bit more of an impact to break it, but it will still break into bigger shards that can wound you.
You should have no problem jitterbugging it with a fine grit sand paper.
Pat
DAVE SMITH
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Joined: Sat Jul 10, 2004 11:12 am
Location: ENGLAND

Re: Toughened glass

Post by DAVE SMITH »

Peace of mind! Thanks Larry and Pat.
Dave
BruceJackson
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Location: Melbourne, Australia
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Re: Toughened glass

Post by BruceJackson »

My most recent project was on toughened glass and I had an interesting conversation with a glass specialist recently about it. He does a lot with kiln-work as well as sand-blasting. He told me that toughened actually scratches more easily than float.

I always assumed the toughening process caused lots of tension in the surface, as though it was pulling in on itself. His comment was that all the internal tension that increases it's strength is actually happening inside the glass, not just at the surface...I don't suppose it actually makes much difference in the way we use it, but his observation of the softness of the surface is worth noting.

Incidentally, this is the fully toughened, explodes into a million fragments type of glass...not just heat-tempered for some additional strength.
DAVE SMITH
Posts: 1213
Joined: Sat Jul 10, 2004 11:12 am
Location: ENGLAND

Re: Toughened glass

Post by DAVE SMITH »

Great advice Bruce. I keyed the glass up , Paint is on now and drying.


Thanks
Dave
BruceJackson
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Location: Melbourne, Australia
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Re: Toughened glass

Post by BruceJackson »

I'm curious about why you are using an epoxy?

I can only assume it's because you intend to do some chemical silvering for a mirror background afterwards.

Is there another reason for choosing this material?

(for any new readers who aren't familiar with mirroring/epoxies....if you want to make a decorated mirror and paint some design on glass with the intention of getting a mirror background, epoxy paints/inks are a good choice because they are capable of withstanding the alkaline process. Normal oil-based lettering enamel doesn't play well with the ammonia used during the silver deposition and the color will probably bloom into the silver.)
Lee Littlewood
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Re: Toughened glass

Post by Lee Littlewood »

Bruce,

BLESSINGS ON YOU. That has indeed been a problem for us and we never heard about the advantages of epoxy inks.
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DAVE SMITH
Posts: 1213
Joined: Sat Jul 10, 2004 11:12 am
Location: ENGLAND

Re: Toughened glass

Post by DAVE SMITH »

Hi Bruce. I would normally use this type of paint for the silvering process but this time I wanted something harder and stronger attached to the glass for the signs I am making. No other reason just a reliable paint that stays adheared to the glass.

Dave
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