The Stovebolt Site Forums The Shop Area General Truck Talk Is after market AD glass tempered safty glass.

Is after market AD glass (from Chevy Duty or American classic) tempered safty glass.

Thats a good question.. neither site seems to specify what sort of glass it is.. I always had just assumed it was original style laminated glass.. but with the prices, maybe i'm wrong!

all of it is "safety glass", tempered or laminated depends on the use - all auto glass after the mid 20's is laminated, windshields still are, while the side glass was tempered by the time of our trucks - whatever they sell will be appropriate, altho tempered glass cannot be "cut to size" but must be shaped before hardening, so if they have 'manufactured' glass for the application, the side glass prolly is tempered, if they have to cut-to-order, it'll just be laminated

you didn't ask, but laminated glass is used where safety is most needed from flying glass, but still being able to see might help - tempered glass shatters into un-sharp, squarish pieces, and if the broken panel stays in place becomes totally opaque, so not desireable for windshields - also the fact that the trucks have laminated glass is why the glass 'fogs' around the edges, and as the lamination breaks down from UV exposure, the fogging grows

Bill

Well i'll say this.. I've seen what windshield glass in an AD truck looks like when a pipe gets rammed thru it.. and i've seen what 'modern' windshield glass does when the same sort of thing gets run thru it.

Old AD glass breaks into shards, newer glass breaks and seems to concentrate the majority of the damage to the point of impact.. with a sort of 'white ring' around the hole.. so I suspect there is a little more going on with the newer glass then there is with the older glass.

Almost like the newer glass design is like a cross between the 'tempered' and 'lamanated'.. maybe it's BOTH?

Maybe Bill or some other person more familure with auto glass than I could shed some light on the subject?

older laminated glass used a different core material, newer stuff is more 'elastic' [polyvinyl buterate?], also the core material, being plastic, deteriorates w/ exposure to UV, so any 50 year old glass won't have near the laminating quality left that it originally had - the lamination should be obvious in a broken window, and it wasn't meant to prevent the shards, just to keep it from flyin around

laminated glass does go thru a heat process that might anneal it to some extent, but I don't think the full annealing process could be done on laminated as it seems it would affect the core plastic adversely

if the new windshields were tempered as well the break would be very small pieces of fairly uniform size, which I've not seen, so I think it's just that they have much better core plastic now

"bullet proof" glass is just laminated glass w/ multiple laminations and thicker layers, and it can be done well enuff to really stop bullets, and GM didn't waste money!

Bill

tempered glass is OUT.A thing from the 20's Everything is saftey glass now or tinted saftey glass.Why would you want to use tempered glass now in todays world ? except in your home or plexic glass which is the way to go at home.Tempered glass you can't cut BOOM.Be safe,update

dan, I think you mean plate glass, tempered glass is used in all new cars today for side & rear windows,,brian

64 your right,sorry

WOW! You guys are good! Windshields are 2 pices of glass with a plastic interlayer of pvb (polyvinyl butyral) in between. They are hot pressed together and formed in molds. Rear windows (back lites) are tempered, as are most side and quarter windows... When it comes to our bolts, or any other old vehicle for that matter, make SURE that if you are going to use a sealant other than the thick gasket, that you use urethane and NOT butyl tape. Butyl tape has a much lower tensil strength than urethane. It is more than just functionality...it is safety. Butyl can be used on quarter and back windows, but I always advise urethane be used due to it's strength...
Dano

I am confused but that is understandable. Watching a glass shop replace a flat windscreen the cut the glass and then put lighter fluid on the seam to burn the 'whatever' between the layers. Not is this hardened, laminate, safety glass or what. I have seen it used in windshields and now wonder if it is acceptable.

it would be laminated safety glasss, it is two sheets w/plastic in the center, tempered safety glass is the stuff that cannnot be cut, shatters into little pieces,,brian

They used laminated saftey glass, That is the correct glass for windshields and any other flat piece of glass ( doors , vents and back ). Personally I plan on having tempered glass made for my door glass' laminated seems to break if the door is slammed to hard. http://www.glasstemp.com/

If the edges are "dressed" ( like pencil edge) laminate is very strong. But i have seen tempered explode from the smallest chip.

Back to the original question. :rolleyes:
I just installed my new glass from LMC, windshields were laminated, sides and rear were tempered. Says so right on the glass.