Properties	Natural Isoprene	Nitrile N.B.R	Neoprene C.R.	Hypalon	Butyle	EPDM	Silicone	Viton Fluoro Carbon	Poly urethane
Hardness Rang (Durometer)	30-90	20-10	30-95	40-95	35-85	40-90	25-85	55-95	60-90+
Tensile Strength (PSI)	3000	3500	3000	2500	2000	3000	1100	1800	4000
Specific Gravity	0.93	1.00	1.23	1.12-1.2	0.92	0.86	0.98	1.85	1.06
Specific Gravity (Base Material)	0.93	1.00	1.23	1.12-1.2	0.92	0.86	0.98	1.85	1.06
Vulcanizing Properties	E	E	E	E	F	E	E	G	E
Adhesion to metals	E	E	E	E	F	E	F	G	E
Adhesion to Fabrics	E	E	E	G	F	G	F	E	E
Tear Resistance	G	F	G	F	G	G	P	F	E
Abrasion Resistance	E	E	E	E	G	E	P	G	O
Compression Set	G	G	G	G	E	G	G	G	F
Electrical Insulation	G	P	G	G	E	E	E	G	G
Permeability to Gases	F	F	P	P	P	F	G	P	F
Acid Resistance	G	G	E	F	F	E	G	E	F
Dilute Concentrated	G	G	G	G	G	E	P	E	P
Solvent Resistance	P	E	G	G	P	P	F	E	E
Alipatic Hydro Carbon	P	G	G	F	P	P	F	E	F
Aromatic Hydro Carbons	G	P	F	P	F	G	F	P	P
Oxygenated (Ketone, etc)	P	F	P	P	F	P	P	P
Laquer Solvents
Resistance To	P	G	G	E	P	P	F	E	E
Swelling in Lubracating	P	G	G	G	P	P	F	E	E
Oil	P	G	G	G	G	G	F	E	E
Oil & Gasoline	G	E	G	G	E	G	E	G	GP1000C
Animal & Vegebale Oil	G	F	E	F	F	E	E	O	E
Water Absorption	F	P	E	O	F	O	E	O	E
Oxidation	P	P	G	O	F	O	G	O	G
Ozone
Sunlight Ageing
Heat Ageing (Upp)	750C	900C	950C	1350C	1100C	1450C	1800C	2050C	850C
Cont. Service	P	P	G	G	P	P	F	E	F
Flame	G	G	G	E	G	E	E	O	G
Heat	E	F	G	G	G	E	E	G	E
Cold
G - GOOD
P - POOR
E - EXCELLENT
F - FAIR
O - OUTSTANDING