MATERIALS

Use Sigma’s Material Selection Guide to ensure your components are made of the high-performance material right for your custom application

MATERIAL SELECTION CHART

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KEY

EXCELLENT
E


GOOD
G


FAIR
F
consult with Sigma for application specifics

POOR
P
not recommended for long term service

Common Name / Base Elastomer	Chemical Name	Material Designation (ASTM D-2000, SAE J 200 Classification)	Material Designation ASTM D7-35, SAE J-14 & MIL-R-3065 (MIL-STD-417)	ASTM D-1418 Designation	Pure Gum Tensile Strength (PSI)	Black Loaded Stocks	Hardness Range (Durometer A)	Specific Gravity(Base Material)	Adhesion To Metals	Adhesion To Fabrics	Tear Resistance	Abrasion+A1:M4 Resistance	Compression Set	Cold Resilience	Hot Resilience	Dielectic Strength	Electrical Insulation	Impermeability to Gases	Resistance to:Swelling in Lubricating Oil	Resistance to:Water Absorption	Resistance to:Oxidation	Resistance to:Ozone	Resistance to:Sunlight Aging	Resistance to: Heat Aging	Resistance to: Flame	Resistance to: Chlorinated Hydrocarbons
Natural Rubber	Polyisoprene	AA	R(N)	NR	Greater Than 3000	Greater Than 3000	30-90	0.93	E	E	G	E	E	E	E	E	G	G	P	G	G	P	P	F	P	P
SBR or GR-S or Buna S	Styrene Butadiene	AA	R(S)	SBR	Less Than 1000	Greater Than 2000	40-90	0.94	E	G	F	G	G	G	G	G	G	F	P	G	F	P	P	G	P	P
Butyl	Isobutylene Isoprene	AA	R(S)	IIR	Greater Than 1500	Greater Than 2000	40-75	0.92	G	G	G	G	F	P	G	G	G	E	P	G	E	E	G	G	P	P
Butadiene	Polybutadiene	AA	R(S)	BR	Less Than 1000	Greater Than 2500	40-80	0.94	E	G	G	E	G	E	E	G	G	G	P	G	G	P	P	F	P	P
EPDM or EP Rubber	Ethylene Propylene	BA, CA, DA	R(S)	EPDM	Less Than 1000	Greater Than 2000	30-90	0.86	G	G	F	G	G	G	G	E	E	G	P	E	E	E	E	E	P	P
Neoprene	Chloroprene	BC, BE	SC	CR	Greater Than 2000	Greater Than 2000	15-95	1.23	E	E	G	G	G	G	G	G	F	G	G	G	G	G	G	G	G	P
CPE	Chlorinated Polyethylene	BC, BE, CE	SC, SB	CM	Greater Than 1500	Greater Than 2500	60-90	1.16-1.32	F	F	F	G	G	F	G	E	G	E	G	G	E	E	E	G	G	P
Nitrile or NBR or Buna N	Acrylonitrile Butadiene	BF, BG, BK, CH	SB, SA	NBR	Less Than 1000	Greater Than 2000	40-95	1	E	G	F	G	G	G	G	P	P	G	G	G	G	F	P	G	P	F
Urethane	Polyester/ Ether Urethane	BG	SB	AU, EU	3000 – 5000	3000 – 5000	30-75D	1.02-1.20	E	G	E	E	G	G	G	E	G	G	G	G	G	E	G	G	F	F
Hypalon	Chlorosulfonated Polyethylene	CE	SC	CSM	Greater Than 1500	Greater Than 2500	40-90	1.12	E	G	F	G	F	F	G	G	G	E	G	G	G	E	E	G	G	F
Epichlorohydrin Rubber	Polyalkylene Oxide	CH	SB, SA	CO/ECO	Less Than 1000	2500	40-90	1.27-1.36	F	F	F	F	P	G	G	G	G	E	E	G	G	E	G	G	F	G
Acrylic	Polyacrylate	DF, DH	TB	ACM/ANM	Less Than 1000	2200	40-90	1.1	G	G	F	F	G	P	P	F	F	G	E	G	E	E	G	E	P	P
Silicone	Polysiloxane	FC, FE, GE	TA	PSi; PVSi, Si, Vsi	Less Than 1200	Greater Than 1200	20-85	1.14-2.05	E	E	P	P	G	E	E	G	E	F	F	E	E	E	E	E	F	F
Fluorosilicone	Fluoroalkyl Polysiloxane	FK	TA, TB	FVS	Less Than 1500	Greater Than 1500	60-90	1.30-2.20	E	E	F	P	G	E	E	G	E	G	E	E	E	E	E	E	E	G
Fluorocarbon	Fluorinated Hydrocarbon	HK	TB	FPM	1200	1500-3000	60-90	1.8	F	G	F	G	G	F	G	G	G	E	E	G	E	E	E	E	E	G

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Knowledge

At Sigma, we utilize cutting edge analytical and design tools everyday. With manufacturing exceeding 30 years, our approach is expertise. We have access to some of the best minds and processes in the industry. Our design engineers routinely make recommendations based on their knowledge and experiences to minimize tooling costs, decrease molding time and expense, and improve product performance.

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– J.R.D. Tata

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