Gasket Materials Physical Properties

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Physical Properties of Common Gasketing Materials

O = Outstanding, E = Excellent, G = Good, F = Fair, P = Poor

Physical Properties

Mechanical Resistances

Temp. Characteristics

Material

Resilience

Drift at Room Temp

Compression Set

Electrical Resistivity

Gas Impermeabitily

Impact Resistance

Abrasion Resistance

Tear Resistance

Cut Growth Resistance

Drift @ 212

Heat Aging @ 212

Flame Resistance

Natural

Synthetic Natural

SBR

Butyl

Polybutadiene

EPDM

Neoprene

F/G

G/E

F/G

NBR

P/F

Polysulfide

P/F

Polyurethane

G/E

F/E

F/G

P/F

Silicone

P/E

F/E

G/E

P/F

P/G

F/G

Hypalon

F/G

Acrylics

F/G

P/F

Fluoroelastomers

G/E

P/G

G/E

Rubber Type	Comparative Cost Index	Weight of Base Elastomer		Physical Properties
		Weight of Base Elastomer		Durometer Range	Tensile-Strenght (PSI)			Elongation (%)			Low Temperature Properties (ºF)
		LB/cu. In.	Specific Gravity	Durometer Range	Reinforced	@ 250 º	@ 400 º	Reinforced	@ 250 º	@ 400 º	Stiffening	Brittle Point
Natural	100	0.033	0.91	30/100	>4000	1800	125	500	500	80	-20 to -50	-70
Synthetic Natural	100	0.033	0.91	40/80	2000 to 3000	1800	125	300 to 700	500	80	-20 to -50	-70
SBR	90	0.034	0.94	40/100	>2000	1200	170	450	250	60	0 to -50	-80
Butyl	110	0.033	0.92	30/100	>2000	1000	350	300 to 800	250	80	-10 to -40	-50
Polybutadiene	95	0.034	0.94	45/80	2500	1200	170	450	250	60	-30 to -60	-100
EPDM	95	0.031	0.86	30/90	2000 to 3000	2000	400	500	300 to 500	0 to 120	-20 to -50	-90
Neoprene	140	0.044	1.23	40/95	>3000	1500	180	650 to 850	350	0 to 100	+10 to -20	-40
NBR	160	0.036	1.0	20/90	1000 to 3500	700	130	400 to 600	120	20	+30 to -20	-65
Polysulfide	220	0.048	1.34	20/80	500 to 1500	700	<25	200 to 550	140	<25	-10 to -45	-60
Polyurethane	410	0.039	1.05	55/100	4000 to 8000	1800	200	250 to 800	300	140	-10 to -30	-60
Silicone	1100	0.036	0.95	25/80	600 to 1500	850	400	90 to 800	350	200	-60 to -160	-90/-180
Hypalon	160	0.040	1.10	50/95	1500 to 2500	500	200	250 to 500	60	20	-30/-50	-50
Acrylics	340	0.040	1.10	40/90	1700	1300	225	450	400	150	+35 to +10	-10
Fluoroelastomers	4100	0.05/0.07	1.4/1.95	65/90	1500 to 3000	300 to 800	150 to 300	100 to 450	100 to 350	50 to 160	+20 to -30	+10/-60

*Comparative Cost Index with natural Rubber as Base (100%)