Ref Description
Density  (S.G.) Hardness Deg Sh A   Tensile Mpa Elongation     % min. Temp Range  Low/High - C Abrasion mm3 Tear   kg/cm
IIR147 A black IIR/SBR blend 55/65° shore
1.2 60 ± 5° 5 300 -30 to +140°C 190 10
IIR147a A black Butyl pond liner grade   55/65°shore 
 1.3 60 ± 5° 5 300 -20 to +110°C n/a n/a
CSM205 A black 'A' grade commercial quality Hypalon   65/75°shore 
 1.4 70 ± 5°