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Properties of Plastic Materials

Plastics Engineering and Design
Engineering Materials and Design

Typical Engineering Properties of Plastics Materials

Material
Densitya
(lb/in3)
Specific
Gravity
Dielectric
Strength
(V/mil)
Coeff. of
Expansionb
(10-6 in/in-°F)
Tensile
Modulus
(103 psi)
ABS, Extrusion Grade
0.038
1.05
53.0
275
ABS, High Impact
0.037
1.03
200
Acetal, 20% Glass
0.056
1.55
1000
Acetal, Copolymer
0.051
1.41
380
47.0
437
Acetyl, Homopolymer
0.051
1.41
58.0
310
Acrylic
0.043
1.19
500
35.0
400
Azdel
0.043
1.19
500
15.0
750
CPVC
0.056
1.55
34.0
400
Fiber Glass Sheet
0.067
1.87
11.1
Nylon 6, 30% Glass
0.050
1.39
1350
Nylon 6, Cast
0.042
1.16
295
45.0
380
Nylon 6 ⁄6, Cast
0.047
1.30
Nylon 6 ⁄6, Extruded
0.041
1.14
600
45.0
390
Nylon 60L, Cast
0.042
1.16
PET, unfilled
0.049
1.36
1300
39.0
500
PTFE (Teflon)
0.079
2.19
480
50.0
225
PVC
0.050
1.39
500
29.5
550
PVDF
0.064
1.77
260
60.0
320
Phenolics
0.050
1.38
11.1
Polycarbonate
0.043
1.19
380
37.5
345
Polyetherimide
0.046
1.27
480
430
Polyethylene, HD
0.035
0.97
475
20.0
156
Polyethylene, UHMW
0.034
0.94
710
19.0
110
Polymethylpentene
0.030
0.83
220
Polymid, unfilled
0.051
1.41
560
300
Polyphenylene Sulfide
0.047
1.30
380
Polypropylene
0.033
0.91
600
96.0
155
Polysulfone
0.045
1.25
425
31.0
360
Polyurethane
0.038
1.05

 

Material
Izod Impact
(ft-lb/in
of notch)
Flexural
Modulus
(ksi at 73°F)
%
Elongation
Hardnessc
Max.
Operating
Temp.
(°F)
ABS, Extrusion Grade
7
300
105 Rr
200
ABS, High Impact
330
105 Rr
Acetal, 20% Glass
0.9
715
94 Rm
Acetal, Copolymer
2
400
13
94 Rm
Acetyl, Homopolymer
320
94 Rm
200
Acrylic
0.5
400
2.7
94 Rm
180
Azdel
14
800
2.1
94 Rm
311
CPVC
3
400
4
212
Fiber Glass Sheet
8
1
101 Rm
260
Nylon 6, 30% Glass
2.8
1400
119 Rr
Nylon 6, Cast
1.4
450
20
100 Rr
210
Nylon 6 ⁄6, Cast
Nylon 6 ⁄6, Extruded
1
240
118 Rr
230
Nylon 60L, Cast
2.2
PET, unfilled
0.5
400
70
230
PTFE (Teflon)
3
80
350
PVC
0.8
400
31–40
110 Rr
170
PVDF
3
200
80
100 Rr
180
Phenolics
2.4
1000
100 Rm
248
Polycarbonate
14
340
110
74 Rm
290
Polyetherimide
1.1
480
Polyethylene, HD
6
160
900
180
Polyethylene, UHMW
No Break
130
450
64 Rr
176
Polymethylpentene
2.5
Polymid, unfilled
1.5
Polyphenylene Sulfide
0.5
550
Polypropylene
0.75
200
120
92 Rr
150
Polysulfone
1.2
390
50
120 Rr
325
Polyurethane
465–520

 

a To obtain specific gravity, divide density in lb/in3 by 0.0361; for density in lb/ft3, multiply lb/in3 by 1728; for g/cm3, multiply density in lb/in3 by 27.68; for kg/m3, multiply density in lb/in3 by 27,679.9.

b To convert coefficient of expansion to 10-6 in/in-°C, multiply table value by 1.8.

c Hardness value scales are as follows: Rm for Rockwell M scale; Rr for Rockwell R scale.

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