The list below depicts the rubbers that can be bonded ordered by their ease of bonding, 1 being the easiest and 7 being the hardest to bond.
Nitrile Rubber (NBR)
Chloroprene Rubber (CR)
Styrene Butadiene Rubber (SBR)
Natural Rubber (NR) / Isoprene Rubber (IR)
Polybutadiene Rubber (BR)
Ethylene Propylene Diene Rubber (EPDM)
Butyl Rubber (IIR)
Due to their low surface energy and chemical inertness EPDM and Silicone rubber can be incredibly challenging to bond. The adhesive selection is critical in these applications to ensure good bonding of these materials.