Les industries Protac Inc. – Rubber Caracteristics

Comparative chart of product features

	Natural rubber	SBR (BUNA-S, GRS)	Neoprene	Nitrile (BUNA-N)	EPDM (EPT, EPR)	Silicone	Viton®
CHEMICAL NAME	Polyisoprene	Styrene butadiene	Polychloroprene	Acrylonitrile butadiene	Ethylene- propylene- diene terpolymer	Polysiloxane	Fluorinated hydrocarbon
SAE 1200 & ASTM D-2000 Designation	AA	AA, BA	BC, BE	BF, BG, BK	BA, CA	FC, FE, GE	HK
ASTM D-1418 Designation	NR	SBR	CR	NBR	EPDM	VMQ	FKM
Minimum Temperature	-55ºC (-67ºF)	-55ºC (-67ºF)	-40ºC (-40ºF)	-40ºC (-40ºF)	-55ºC (-67ºF)	-65ºC (-85ºF)	-40ºC (-40ºF)
Maximum Temperature	50ºC (122ºF)	70ºC (158ºF)	100ºC (212ºF)	100ºC (212ºF)	120ºC (275ºF)	225ºC (437ºF)	225ºC (437ºF)
Usual Shelf Life	3-5 years	3-5 years	5-10 years	5-10 years	5-10 years	Up to 20 years	Up to 20 years
Advantages	Outstanding elasticityGood flexibility at low temperatures	Very good flexibility at low temperatures	Good resistance to flame Very good resistance to weather, ozone and natural aging Very good resistance to alkalis and acids	Very good resistance to oils and fuel Superior resistance to petroleum–based hydraulic fluids Wide range of service temperatures Very good resistance to alkalis and acids	Excellent heat, ozone and sunlight resistance Very good flexibility at low temperatures Good resistance to alkalis and acids, and solvents Superior resistance to water and steam	Flexible at extreme temperatures Low compression setExcellent ultraviolet, weather and ozone resistance Inert, odourless, tasteless and non‑toxic	Excellent resistance to a wide variety of oils, fuel, solvents and acids at high temperatures Very good impermeability to gases and steam Very good weather, ozone and sunlight resistance
Limitations	Poor heat, ozone and sunlight resistance Very little resistance to oils, fuel and to hydrocarbon solvents	Poor heat, ozone and sunlight resistance Very little resistance to oils, fuel and to hydrocarbon solvents	Poor to low resistance to aromatic solvents Limited capacities at low temperatures	Low resistance to ozone, sunlight and natural aging Poor resistance to polar solvents	Poor resistance to oils, fuel and to hydrocarbon solvents	Poor abrasion and tear resistance Poor resistance to solvents, alkalis and acids	Will be severely attacked by certain solvents such as esters, ethers and acetates
PHYSICAL PROPERTIES
Tensile Strength	E	F-G	VG	VG	F-G	VG	VG
Ultimate Elongation	VG-E	G	G	G	G	VG-E	F-G
Compression Set	G	G	F-G	G	G	VG-E	VG-E
Heat Resistance	F	F-G	F-G	G	VG-E	E	E
Resistance to Flame	P	P	G	P	P	F-G	VG-E
Resilience	E	F-G	VG	F-G	G	G	F
Abrasion Resistance	E	VG-E	VG-E	VG-E	VG-E	P-F	F-G
Water Resistance	E	VG-E	G	VG-E	E	VG-E	G
CHEMICAL RESISTANCE PROPERTIES
Acids	F-G	F-G	G	G	G	F	B
Alcohol	G	G	VG	F-G	F-G	G	F-G
Animal and vegetable oils	F	F	G	VG	G	G	E
Oils and fuel	P	P	F-G	G-E	P	P-F	E
Hydrocarbon solvents	P	P	G	E	P	P-F	E
Oxygenated solvents	G	G	P-F	P	VG	F	P

Legend

E = EXCELLENT
VG = VERY GOOD
G = GOOD
F = FAIR
P = POOR

This data and information are intended as guides only. Complete data on physical properties of products are available on request. Performance may vary within a rubber category depending on the compounds available.

Viton® is a registered trademark of Dupont.