SBR stands for styrene butadiene rubber. Its technical chemical type is Styrene-butadiene copolymer and is a very abrasion resistant material and has good physical strength.
Recycled rubber is a select mix of 20-30 mesh recycled tire crumb rubber and polyurethane binders. The mix combination is poured into molds and compacted under controlled temperature and pressure. Finished products are extracted and trimmed and are then ready to go!
EPDM is Ethylene Propylene Diene Monomer, a synthetic rubber. It's a highly flexible stable material, a terpolymer of ethylene and propylene. It has a saturated polymer chemical "backbone," which gives it excellent resistance to ozone and many other advanced chemicals found in today's environment.