Rob;
Some distributors DO have quality gasket materials.
There are two main factors in quality sponge rubber gaskets.
1. Cell structure- open cell which collapses readily, and closed cell which maintains its resiliancy
2. Type of elastomer - must be a material not affected by common cleaning chemicals.
We use 1/4" material on our TM vac tank and portable gasket applications.
On some heat exchanger applications, we use a 1/8" Silicone rubber tape rated for 600° usage. It also lasts longer at lower temperatures.
Larry Cobb
Mikey Board Supporting Member