A16
Typical Properties of
Cross-Linked Rubber
Compounds
A16-1
q
2006 by Taylor & Francis Group, LLC
A.
Diene-Based Polymers and Copolymers
Styrene–Butadiene
Random Copolymer,
25% (wt) Styrene
(SBR)
Styrene–Butadiene
Block Copolymer,
about 25% Styrene
(YSBR)
Cis-1,4- Polyisoprene
(Natural Rubber NR,
Also Made
Synthetically IR)
Cis-1,4
Polybutadiene (BR)
Polychloroprene
(CR), Neoprene
Butadiene–
Acrylonitrile
Random Copolymer,
Variable %
Acrylonitrile (NBR)
Reclaimed Rubber
(Whole Tires)
(Mainly NR and
SBR)
Gum stock (cross-
linked, Unfilled)
Density (g/cm
3
)
0.94
0.94–1.03
0.93
0.93
1.23
1.00
1.2 (compd’d)
Tensile strength
(psi)
a
200–400
1700–3700
2500–3000
200–1000
3000–4000
500–1000
Resistivity (ohm cm,
log)
15
13
15–17
—
11
10
Dielect. const. at
1 kHz
3.0
3.4
2.3–3.0
2.3–3.0
9.0
13
Dielect. str. (kV/in.)
b
—
485
—
—
150–600
Diss. factor, at 1 kHz 0.003
0.01
0.002–0.003
0.002–0.003
0.03
0.055
Reinforced stock
Tensile strength
(psi)
a
2000–3500
1000–3000
3000–4000
2000–3500
3000–4000
3000–4000
500–1000
Elong. at break (%)
300–700
500–1000
300–700
300–700
300–700
300–700
300–400
Hardness, Shore A
40–100
40–85
20–100
30–100
20–100
30–100
50–100
Cont. high-temp.
limit (8C)
110
65
100
100
120
120
100
Stiffening temp. (8C) K20 to K45
K
50 to K60
K
30 to K45
K
35 to K50
K
10 to K30
0 to K30
K
20 to K45
Brittle temp. (8C)
K
60
K
70
K
60
K
70
K
40 to K55
K
15 to K55
K
60
Resilience
Good
Excellent
Excellent
Excellent
Good
Fair
Good
Resistance to
Acid
Good
Good
Good
Good
Good
Good
Good
Alkali
Good
Good
Good
Good
Good
Good
Good
Gasoline and oil
Poor
Poor
Poor
Poor
Good
Excellent
Poor
Aromatic
hydrocarbons
Poor
Poor
Poor
Poor
Fair
Good
Poor
Ketones
Good
Poor
Good
Good
Poor
Poor
Good
Chlorinated
solvents
Poor
Poor
Poor
Poor
Poor
Poor
Poor
Oxidation
Good
Good
Good
Good
Excellent
Fair
Good
Ozone
Good
Good
Good
Good
Poor
Fair
Good
Abbreviations are according to ASTM.
a
1000 psiZ6.895 MPa.
b
1 kV/in.Z0.0394 MV/m.
q
2006 by Taylor & Francis Group, LLC
A16
-2
Plastics
T
echnology
Handbook
B.
Saturated, Carbon–chain Polymers
Polyisobutylene
(Butyl Rubber,
Copolymer with
0.5–2% Isoprene)
(IIR)
Chloro-Sulfonated
Polyethylene (CSM)
Ethylene–Propylene
Random Copolymer,
50% Ethylene (EPM)
Ethylene–Propylene
Random Terpolymer
50% Ethylene
(EPDM)
Poly(Ethyl Acrylate),
Usually a Copolymer
(ACM)
Vinylidene–
Fluoride–
Chlorotrifluoro
Ethylene Random
Copolymer (FKM)
Vinylidene–
Fluoride–
Hexafluoropropylene
Random Copolymer
(FKM)
Gum stock (cross-
linked, unfilled)
Density (g/cm
3
)
0.92
1.12–1.28
0.86
0.86
1.10
1.85
1.85
Tensile strength (psi)
a
2500–3000
2500
500
200
200–400
200–2500
2000
Resistivity (ohm cm,
log)
17
14
16
16
—
14
13
Dielect. const. at
1 kHz
2.1–2.4
7–10
3.0–3.5
3.0–3.5
—
6
—
Dielect. str. (kV/in.)
b
600
500
900
900
—
600
250–750
Diss. factor, at 1 kHz 0.003
0.03–0.07
0.004–0.008
0.004–0.008
—
0.05
0.03–0.04
Reinforced stock
Tensile strength (psi)
a
2000–3000
3000
1000–3000
1000–3500
1500–2500
1500–2500
1500–2500
Elong. at break (%)
300–700
300–500
200–300
200–300
250–350
300–400
300–400
Hardness, Shore A
30–100
50–100
30–100
30–100
40–100
50–90
50–90
Cont. high-temp.
limit (8C)
120
160
150
150
175
200
250
Stiffening temp. (8C)
K
25 to K45
K
10 to K30
K
40
K
40
—
K
35
—
Brittle temp. (8C)
K
60
K
40 to K55
K
50 to K75
K
50 to K75
K
30
K
50
K
45
Resilience
Fair
Good
Good
Good
Fair
Fair
Fair
Resistance to
Acid
Excellent
Good
Excellent
Excellent
Fair
Excellent
Excellent
Alkali
Excellent
Good
Excellent
Excellent
Poor
Good
Good
Gasoline and oil
Poor
Good
Poor
Poor
Good
Excellent
Excellent
Aromatic
hydrocarbons
Poor
Fair
Fair
Fair
Good
Good
Excellent
Ketones
Excellent
Poor
Good
Good
Poor
Poor
Poor
Chlorinated
solvents
Poor
Poor
Poor
Poor
Poor
Good
Good
Oxidation
Excellent
Excellent
Excellent
Excellent
Excellent
Good
Excellent
Ozone
Excellent
Excellent
Excellent
Excellent
Excellent
Good
Excellent
Abbreviations are according to ASTM.
a
1000 psiZ6.895 MPa.
b
1 kV/in.Z0.0394 MV/m.
q
2006 by Taylor & Francis Group, LLC
T
ypical
Properties
of
Cross-Linked
Rubber
Compounds
A16
-3
C.
Heterochain Polymers
Poly(Dimethyl Siloxane)
Silicone Rubber, Usually
Copolymer with Vinyl
groups (VMQ)
Poly(Dimethyl Siloxane)
Copolymer with Phenyl-
Bearing Siloxane and Vinyl
Groups (PVMQ)
Room Temperature
Vulcanizing Silicone
Polysulfide (ET and EOT)
Polyurethane (AU and EU)
Gum stock (cross-linked,
unfilled)
Density (g/cm
3
)
0.98
0.98
1.0–1.3 (compd’d)
1.35
1.25
Tensile strength (psi)
a
50–100
50–100
—
100–200
2000–4000
Resistivity (ohm cm, log)
11–17
11–17
15
12
11–14
Dielect. const. at 1 kHz
3.0–3.5
3.0–3.5
2.8
7–9.5
5–8
Dielect. str. (kV/in.)
b
100–600
100–600
500
250–600
350–525
Diss. factor, at 1 kHz
0.001–0.010
0.001–0.010
0.003
0.001–0.005
0.02–0.09
Reinforced stock
Tensile strength (psi)
a
500–1200
500–1500
400–800
1300–1800
3000–10,000
Elong. at break (%)
200–700
200–700
100–200
200–500
200–600
Hardness, Shore A
30–80
30–80
30–50
25–85
20–100
Cont. high-temp. limit (8C)
250
300
200–250
120
120
Stiffening temp. (8C)
K
50
K
100
K
50 to K100
K
25
K
25 to K35
Brittle temp. (8C)
K
50
K
120
K
50 to K100
K
50
K
50 to K60
Resilience
Fair
Fair
Fair
Fair
Poor
Resistance to
Acid
Fair
Fair
Fair
Fair
Fair
Alkali
Fair
Fair
Fair
Good
Poor to fair
Gasoline and oil
Poor
Poor
Poor
Excellent
Excellent
Aromatic hydrocarbons
Poor
Poor
Poor
Good
Good
Ketones
Excellent
Excellent
Excellent
Good
Poor
Chlorinated solvents
Poor
Poor
Poor
Good
Poor
Oxidation
Excellent
Excellent
Excellent
Excellent
Excellent
Ozone
Excellent
Excellent
Excellent
Excellent
Excellent
Abbreviations are according to ASTM.
a
1000 psiZ6.895 MPa.
b
1 kV/in.Z0.0394 MV/m.
q
2006 by Taylor & Francis Group, LLC
A16
-4
Plastics
T
echnology
Handbook
Document Outline
- Table of Contents
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