914 Windshield inside OEM Glass Sticker logo?, Anyone making these OEM Windshield Mfg. Stickers Options

[TJB/914]

Looking for help if anyone makes these OEM Windshield Sticker's?
Are they different for every model year?
Many years ago while restoring my 914 I used a solvent to clean up the windshield glass & destroyed the letters. I would like one for my OEM original windshield (IMG:style_emoticons/default/pray.gif)
This is off as recent 1976 in a local shop for repairs in this photo.
Tom Michigan

[vitamin914]

Heat absorbing glass has been around for an awfully long time. PPG came out with Solex (now called Solexia by the new owners) back in the 1930s. Nothing really exotic about it, the glass has a greenish tinge or tint. It basically adds an impurity of iron and or chromium ions that does not transmit IR but absorbs it. I think it also has higher UV absorption too. The car still gets hot inside.

PPG had IR reflective glass (Sungate?) but I think this was a metallic coating on the inside next to the vinyl to reflect IR. They used to apply it with sputter coating ion deposition technology. From the late 80s onwards there was a big push to add technology to laminated parts. Thin film deposition gave better IR /UV performance (but would stop your radar detector from working too). Rain sensors, heated w/s, heads up display reflectors and all kinds of stuff. Most of it was gimmicky and short lived. About the only thing I sometimes see these days is a heating grid under the parked wipers for freezing rain. But I doubt these are useful in places like Los Angeles or Sydney.

One of my 914's replaced w/s is made with Solex glasss so it has been around for ages and continues to be made (the other w/s is made by Sigla so not OEM either). I'm sure other companies have identical equivalents - patents have long run out.




I noticed something interesting when I was in a junk yard looking at dead 914s. All the cars that had heated rear windows had clear (not the greenish heat absorbing tint) glass all around. I guess it sort of makes sense - you don't need heat protection glass if the car is in a cold climate with a heated back window... I harvested a heated back window from one of the five dead 914s.




Speaking of heated back windows... Tin float glass picks up tin ions in the surface that contacts the molten tin bath. With a UV light source, you can identify the tin side. It fluoresces a whitish glow compared to the non tin side. This is important for making windows with heated circuits. If the heated circuit is printed on the tin side it will appear a dark reddish brown color from the outside of the vehicle. If printed on the non tin side it would be a lighter orange color. Most auto companies wanted it darker although there were a few Japanese makers that wanted the lighter color ...more trivia.

[wonkipop]

Heat absorbing glass has been around for an awfully long time. PPG came out with Solex (now called Solexia by the new owners) back in the 1930s. Nothing really exotic about it, the glass has a greenish tinge or tint. It basically adds an impurity of iron and or chromium ions that does not transmit IR but absorbs it. I think it also has higher UV absorption too. The car still gets hot inside.

excellent bit of info @vitamin914 .

i'd say thats pretty much all a 914 "tinted" screen is.

the DELODUR 1 on the side windows looks like its what we call low iron or ultra clear glass in construction circles. DELODUR 1 is probably toughened plate or sheet versus DELODUR F being toughened float. the glass would have come out of two different processes or production lines. the float glass they were using appears to have been naturally greener (darker) due to its composition.
they just amped it up with the outer layer of the windscreen lamination for the so called tinted screen with extra ingredients in the glass mix as you say. (IMG:style_emoticons/default/beerchug.gif)

i'll be interested to see if porsche museum gets back to me.
the curator did last time i wrote.
so long as you are very specific about what you want and it won't take too much time he wanders over with his iphone, takes a snap and emails it directly.

[vitamin914]

Heat absorbing glass has been around for an awfully long time. PPG came out with Solex (now called Solexia by the new owners) back in the 1930s. Nothing really exotic about it, the glass has a greenish tinge or tint. It basically adds an impurity of iron and or chromium ions that does not transmit IR but absorbs it. I think it also has higher UV absorption too. The car still gets hot inside.

excellent bit of info @vitamin914 .

i'd say thats pretty much all a 914 "tinted" screen is.

the DELODUR 1 on the side windows looks like its what we call low iron or ultra clear glass in construction circles. DELODUR 1 is probably toughened plate or sheet versus DELODUR F being toughened float. the glass would have come out of two different processes or production lines. the float glass they were using appears to have been naturally greener (darker) due to its composition.
they just amped it up with the outer layer of the windscreen lamination for the so called tinted screen with extra ingredients in the glass mix as you say. (IMG:style_emoticons/default/beerchug.gif)

i'll be interested to see if porsche museum gets back to me.
the curator did last time i wrote.
so long as you are very specific about what you want and it won't take too much time he wanders over with his iphone, takes a snap and emails it directly.

@wonkipop

I hope the curator sends something useful too. You would expect, if it is a good example, the car would be a rather unmolested original "production" vehicle. Of course there is always the danger that the glass was experimental i.e. not intended for public use. We had a research group that made all sorts of one-offs and specials. They even made huge bubble canopies with chemically tempered glass (like smartphone screens) for concept cars to show off capabilities.