Instructables

Heat absorbing glass question

I'm taking apart a Kodak 4200 projector. The lamp assembly includes a piece of "heat absorbing glass".  The manual says not to touch it unless wearing gloves, to keep it covered when out of the projector, and that it may shatter.  Being clueless, this sounds spooky.   Is it dangerous, or will I just wreck it for projection if I get fingerprints on it?  Most glass shatters, but is this going to spontaneously burst into shards?  It's not going back into the projector.   Is it useful for anything, or should I wrap it in foil and toss it in the garbage?

kelseymh4 months ago

I can understand why the instructions might sound spooky, but they are written for the case where you're going to put the projector back together again. That glass is designed to absorb and dissipate the intense heat from the projector lamp itself. If you get fingerprints, or any skin oil, onto the glass, that oil will absorb more heat than the glass can handle, and the glass will break at that point.

If you do not plan to use the projector again, and you do not plan to ever use the heat-absorbing glass for high temperature applications, then don't worry about it. Just pack it away safely until you need it.

If you do want to use it in some other high-temperature project, then you should follow the handling instructions, wrap it in lint-free paper or cloth (like a lens-polishing cloth, or paper Kimwipes), and store it safely.

mole1 (author)  kelseymh4 months ago

Thanks, kelseymh! I'm greatly relieved.