"spamtrap1888"

Used by Fender guitar amp company and used eyelets for soldering component
leads into. What was the material made of and how/why does it go bad?

What color is it and how thick is it?


** Grey, about 0.5mm thick.


Circuit boards in general "go bad" because they absorb moisture,


** This stuff is a moisture absorber - something well known to Fender and
others who used it.

Sooo, they hot impregnated it with wax !!!

The KOOK has failed to mention this crucial fact.

The hot wax treatment is not 100% effective and if the item is left in damp
storage for a long time, moisture gets into the material. Re-heating and
melting the wax has no good effect.

The material is like stiff cardboard and was used as SECONDARY electrical
insulation in transformers, ie to separate windings from the core.

Such transformers were vacuum impregnated in varnish after manufacture which
made the grey material insulate OK.


.... Phil