GUIDE TO GENERAL PROPERTIES - RUBBER COMPOUNDS

NR

SBR

NBR

HNBR

NBR/PVC

CR

IIR

Hardness, IRHD

30-100

40-100

40-95

45-95

40-95

40-90

40-80

Tensile strength

E

G

G

E

G

VG

F

Compression Set

VG

VG

G

G

F

G

F

Resistance to Ozone

F

F

F

VG

G

VG

VG

Tear Resistance

E

VG

G

VG

G

G

F

Dynamic Properties

E

VG

F

G

F

G

G

Low Temperture resistance Deg C

-45

-45

-25

-30

-25

-35

-45

Maximum continuous operating temperture Deg C

80

85

100

160

100

95

130

Maximum intermittant operating temperture Deg C

110

115

130

180

130

125

150

Fuel Resistance

U

U

G

G

F

P

U

Oil Resistance

U

U

VG

VG

VG

F

U

Resistance to Dilute Acid

G

G

F

G

G

G

VG

Resistance to Dilute Alkali

G

G

G

G

G

VG

E

EPDM

CSM

ACM

EAM

ECO

FKM

PNR

Hardness, IRHD

25-90

40-85

50-85

45-90

40-90

45-95

15-40

Tensile strength

G

VG

F

F

G

G

F

Compression Set

VG

F

F

F

F

G

G

Resistance to Ozone

E

E

E

E

VG

E

F

Tear Resistance

F

G

F

F

G

P

F

Dynamic Properties

F

G

P

P

F

P

G

Low Temperture resistance Deg C

-50

-20

-20

-30

-30

-20

-50

Maximum continuous operating temperture Deg C

130

120

150

150

130

205

110

Maximum intermittant operating temperture Deg C

150

150

170

170

150

270

130

Fuel Resistance

U

P

P

P

VG

E

U

Oil Resistance

U

G

E

VG

VG

E

U

Resistance to Dilute Acid

VG

VG

U

U

G

E

F

Resistance to Dilute Alkali

E

VG

P

P

VG

VG

VG

E = Excellent

VG = Very Good

G = Good

F = Fair

P = Poor

U = Unsuitable

The above table of properties is intended as a guide only. Certain properties can be modified by the addition of differient compounding ingredients. Improvement in certain properties may detract from performance in other areas.