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Insulator
?
?
Plastic material used by LEMO for manufacturing insula-
tors is selected according to the electric and thermal
properties required for the various connector types. Char-
acteristics examined for the two connector types are:
– Dielectric strength;
– Comparative tracking index;
– Surface and volume resistivity;
– Continuous service temperature;
– Water absorption;
– Radiation resistance;
– Flammability rating
Radiation resistance
PA 6.6
PEEK
PTFE
FEP
PI
– Resistance to hydrocarbon.
rads
10 3
10 4
10 5
10 6
10 7
10 8
10 9
10 10
10
Gray (Gy) 10 1
10 2
10 3
10 4
10 5
10 6
7
10 8
Mechanical and Electrical Properties
Radiation dose γ
Mechanical characteristics of thermoplastics, such as PA
6.6, and PEEK, are improved by the addition of glass
Damage
Minimum to slight (almost available usable)
fibres. By adding glass fibres in the resin the performance
of this material (mechanical strength and radiation resis-
tance) is enhanced and water absorption rate is reduced.
From an electric point of view, the addition of glass fibres
improves dielectric strength.
Selection of the insulator
A number of thermoplastics have common characteristics,
some of them are identical with other insulating materials.
In this case, the insulator material is selected according to
the specific difference in features to provide all the required
parameters for the given type.
Technical characteristics
Slight to medium (often satisfactory)
Medium to serious (not usable)
Note: technical data in this chapter provide general information on plastics
used by LEMO as electrical insulators. LEMO reserves the right to propose
new materials with better technical characteristics, and to withdraw, with-
out notice, any material mentioned in the present catalogue or any other
publications edited by LEMO S.A. and/or its subsidiaries. LEMO SA and
its subsidiaries use only plastic granules, powder or bars supplied by spe-
cialized companies, and thus cannot in any case take responsibility with regard
to this material.
Type
Dielectric strength
Volume resistivity at 50% RH and 23°C
Surface resistivity
Thermal conductivity
Comparative tracking index
Dielectric constant (10 6 Hz)
Dissipation factor (10 6 Hz)
Maximum continuous service temperature
Maximum short-time service temperature
Minimum continuous service temperature
Water absorption in 24h at 23°C
Radiation resistance
Flammability rating
Standard
ASTM D 149 / IEC 60243
ASTM D 257 / IEC 60093
ASTM D 257 / IEC 60093
ASTM C 177
IEC 60112
ASTM D 150 / IEC 60250
ASTM D 150 / IEC 60250
UL 746
–
–
ASTM D 570 / ISO R624
–
ASTM D 635 / UL 94
Units
kV/mm
Ω ● cm
Ω
W/K ● m
V
–
–
°C
°C
°C
%
Gy
–
PA6.6
15-17
5.8x10 15
10 12
0.21
CTI 600
4
–
120
150
–
< 0.7
5x10 3
–
PEEK
19-25
10 16
10 15
0.25
CTI 150
3.2-3.5
< 0.005
250
300
-55
< 0.3
10 7
V-0/3.2
PTFE
17.2-24
10 18
10 17
0.23
CTI 500
2-2.1
< 0.0003
260
300
-200
< 0.01
2x10 2
V-0
FEP
20
> 10 16
> 10 16
0.24
–
2.1
< 0.001
200
260
-200
< 0.01
2x10 4
V-0
PI
22
> 10 16
> 10 15
0.35
–
3.6
< 0.0034
350
480
–
0.24
10 6
–
Designation
chemical
commercial
Symbol
Standard
00
Unipole
S E
00
S
E
Multipole
B K 2C 2G 1D
Polyamide (glass fitted)
Nylatron ?
PA 6.6
–
●
●
●
Polyether Ethercetone
Peek ?
PEEK
–
●
●
●
●
●
●
●
●
●
●
Polytetrafluorethylene
Tetrafluorethylene
Polyimide
–
–
Vespel ?
PTFE
FEP
PI
ASTM D 1457-83
ASTM D 2116-81
–
●
●
●
●
●
●
●
● First choice alternative
● Special order alternative
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