Brand "X" Glass


CGF II, Certified Grumble Framer Level 2
Aug 9, 2003
setauket, ny
A vendor is having a glass sale on "Conservation Clear" glass. They say it has 99%UV blockage with protective film.

Question 1: What does that mean... "with protective film"?

Question 2: This is not a name-brand product. It is the vendor's own product. Would you have any problem using this "brand-x" glass on a customer's project?

I use Acrylite AR-OP3 acrylic as my default, but I was thinking of stocking some glass to give the customer more of a choice.
hey why not try the black light test? if it seems to be the same then...? if they want you to use it try to get them to float you a piece of float glass to try out.

There is a big difference between "optically coated" UV glass and UV screening with a "protective film". That could be almost anything from leftover low E film that was used on house windows years ago to some kind of transfer film that may or may not filter out anything.

I guess I still adhere to the old adage that you get exactly what you pay for. If it seems too good to be true, it probably is.

It sounds like Guardian Glass that comes with a plastic film rather than interleaved paper protecting the UV coating until time to be used. Score through the film to cut the glass, then remove the film. Most of it is 2mm vs 2.5mm, but I don't have a problem with the thinner glass. Smooth coating rather than ripples in the coating with the TruVue name.

Since it's 20% thinner, should be 20% less expensive? 20% thinner = less green tint.

The Guardian product does pass the UV lamp test, though it's probably tough for an eye to see the difference between 98% and 99%.
Relative to not much said here, I was talking to a bunch of distributors here the other day, and one of them said something I hadn't thought much about. He said the 2mm glass is easier to work with because it's less brittle. Thinner means it flexes more, thus breaking less. Thicker means it is less tolerant of flexing. The others all nodded their heads wisely.

If I remember, TV's date goal is January 1 to have converted all their glass substrate to waterwhite. No green at all then.
That will be so nice MerpsMom.
That green reflection, albeit mute, on the Museum is the only detraction I have heard from customers.

I show them the little tassle sample box, and they just love it. The price is a little gulp, but then they tap the sample glass again and go for it.... then they get the picture and the green is there. I point to my sample picture, but they aren't REALLY happy.
Mmm, not a brand name glass, so not Guardian.

Protective film to block uv, so as FG said, this could be a bit dodgy long term.
I have a background in the general glazing industry, and we used to film windows, to stop uv fading etc, and I would think the film is more noticeable than uv applied coating (even TV with it's varying ripple effect).

BTW, Guardian use low iron base glass, so is clearer body than TV, though jfeig mentioned a while ago on the Aussie Grumble that TV will soon be using Guardian base glass, so no more greenish tint, especially on whites etc.

The Guardian is much smoother, due to spraying coating rather than (TV) rolling.

And a final BTW, I find that trying to score the Guardian on the film side to be quite difficult, preferring to score non-coated side, run it with film on, then folding upright on bench and running down the film with sharp blade.
I cut on a bench though (not a wall cutter), and I am not a framer, though one of my framing clients here has tried to cut with varying pressures on his wall cutter, and he too resolved to cut the way I do.