Following is data on typical plastics used for burn-in and test sockets.
Thermoplastics Data
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THERMOPLASTICS
|
Nylon
6 / 12 |
Nylon
4 / 6 (30% glass) |
Polyester
PET |
Polycarbonate
Lexan® |
Polyester
PBT (Valox®) |
Polysulfone
|
Modified Polyester
TFE (Tefzel®) |
Polyetheretherketone
PEEK |
Polyetherimide
PEI (Ultem®) |
LCP 175°C Max Use
|
LCP 300°C Max Use
|
Polyphenylene Sulfide
PPS (Ryton®) |
Polyethere Sulfide
PES |
Polyamide-imide
PAI (Torlon®) |
General Properties
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Specific Gravity
|
1.07
|
1.68
|
1.27
|
1.21
|
1.62
|
1.24
|
1.86
|
1.32
|
1.51
|
1.61
|
1.57
|
1.60
|
1.51
|
1.40
|
Water Absorption
(% at 24 hrs) |
0.40
|
1.60
|
0.05
|
0.15
|
0.07
|
0.22
|
0.20
|
0.50
|
0.16
|
0.02
|
0.01 – 0.02
|
0.05
|
0.20
|
0.28
|
Max Suggested Continuous
Temp (°C) |
65
|
149
|
120
|
125
|
140
|
150
|
150
|
160
|
165
|
175
|
250
|
210
|
225
|
250
|
Mechanical Properties
|
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Flexural Strength
(x 104 psi – average) |
1.40
|
3.40
|
3.35
|
1.32
|
2.70
|
1.54
|
3.00
|
2.40
|
3.30
|
3.70
|
2.30
|
2.68
|
1.72
|
3.07
|
Flexural Modulus
(x 106 psi – average) |
0.29
|
1.30
|
1.30
|
0.325
|
1.10
|
0.39
|
0.95
|
0.59
|
1.30
|
2.10
|
1.50
|
1.70
|
0.59
|
0.644
|
Compressive Strength
(x104 psi – average) |
2.40
|
N/A
|
2.50
|
1.25
|
1.80
|
1.39
|
1.00
|
2.50
|
3.70
|
2.00
|
N/A
|
2.10
|
N/A
|
4.00
|
Tensile Strength
(x 104 psi – average) |
8.80
|
2.30
|
2.30
|
9.00
|
1.70
|
1.02
|
1.20
|
1.45
|
2.00
|
3.00
|
2.40
|
1.90
|
1.20
|
2.69
|
Izod Impact Strength
(notch side 23°C ft-lbs/in) |
1.00
|
1.30
|
1.90
|
12.00
|
1.30
|
1.20
|
7.00
|
1.80
|
2.00
|
2.80
|
2.20
|
1.40
|
1.50
|
2.50
|
Hardness
Rockwell Scale |
R-114
|
R-120
|
M-100
|
M-70
|
M-90
|
M-69
|
R-50
|
M-99
|
M-114
|
M-87
|
N/A
|
R-123
|
M-98
|
E-78
|
Electrical Properties
|
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Dielectric Constant
(60 Hz, dry) |
4.00
|
4.20
|
3.60
|
3.01
|
3.80
|
3.07
|
2.60
|
3.20
|
3.70
|
4.10
|
2.90
|
3.90
|
N/A
|
4.00
|
Dielectric Strength
(volts/mil, short time, dry) |
400
|
N/A
|
550
|
425
|
750
|
425
|
400
|
480
|
770
|
1100
|
1100
|
450
|
780
|
600
|
Dissipation Power Factor
(1 MHz dry) |
0.02
|
0.023
|
0.012
|
0.01
|
0.02
|
0.003
|
0.005
|
0.003
|
0.005
|
0.006
|
0.003
|
0.006
|
N/A
|
0.009
|
Volume Resistivity
(1015½-cm at 23°C) |
1
|
3
|
30
|
10
|
3.4
|
50
|
10
|
49
|
30
|
1
|
1
|
4.5
|
10
|
3
|
Arc Resistance
(seconds) |
121
|
N/A
|
90
|
120
|
28
|
122
|
72
|
N/A
|
85
|
137
|
137
|
34
|
N/A
|
125
|
Thermal Properties
|
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Deflection Temperature
(at 264 psi °C) |
82
|
284
|
224
|
132
|
204
|
174
|
210
|
160
|
210
|
230
|
241
|
243
|
210
|
275
|
Coefficient of Linear Expansion
(10-5 inch/inch at 23°C) |
5.00
|
N/A
|
29
|
3.75
|
3.30
|
3.10
|
0.72
|
2.60
|
3.10
|
5.00
|
N/A
|
1.20
|
2.60
|
2.00
|