When Rubber just won't do the job!
Rubber, soft plastic, polyurethane, leather, and felt are rated on the
"Shore A" scale.  Hard materials such as hard rubber, rigid PVC, nylon,
acrylic, polyurethane, and ABS are rated on the "Shore D" scale.
Forsch Polyurethane Elastomers

Superior oil and chemical resistance
Outstanding abrasion and tear resistance
Convenient ready to use kits,
liquid or putty systems,
durometer hardness from