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Hey Jesse- Safety glass is a 3-ply thing: 2 plies of tempered glass with a sticky piece of plastic sandwiched in between. Tempered glass is stronger than regular glass, but often when it breaks it shatters into a billion places. The sticky piece of plastic keeps all the shards of glass in place, away from the passengers. However, that piece of plastic ages, especially when heat is applied to it. So, often old VWs develop the milkyness around the defroster vent area. I wonder if newer safety glass uses a different plastic compound to avoid this problem... Take care, Shad ----- Original Message ----- From: "jesse and monica" <jjmojo@blazenet.net> To: <type3@vwtype3.org> Sent: Sunday, September 23, 2001 12:28 PM Subject: [T3] What causes? > Hello T3'rs, > What causes old glass to start to get milky looking? I know it's the age > but what actually causes it? Just wondering. > later, > jesse > 71 fi squareback > and looking for another.... > > ------------------------------------------------------------------- > Unsubscribe? mailto:type3-request@vwtype3.org, Subject: unsubscribe > >