Rubber-Cal Buna-N Sheet- 0.125-in Thick x 36-in Width x 12-in Length- 60A Durometer- Black- ASTM D2000 BG in the Rubber Sheets & Rolls department at Lowes.com
Understanding the Composition of a Nitrile (Buna-N) Rubber Compound | Hot Topics
Pros and cons of Buna-N | What is Buna-N? | NBR properties