In a message dated 11/2/04 8:51:27 PM, danielcroberts@AOL.COM writes:

> Interesting temperature readings. Does anyone know whether these temps for
> the higher watt
> bulbs are sufficient to degrade the plastic housing on the turnsignal, or
> degrade other materials
> near the bulb.
> Dan
> 89 Westy 4speed
>
Many commercial plastics have glass transition temperatures (significant
phase or property changes) in the range of 140 to 225 C. This would lead to
softening, color changes, opacity changes. All such effects are strongly enhanced by
the presence of oxygen or water vapor at these temperatures.

Frank Grunthaner