Datasheet

175www.lemo.com
®
®
Radiation resistance
PA 6.6
PEEK
PTFE
FEP
PI
Damage
Minimum to slight (almost available usable)
Slight to medium (often satisfactory)
Medium to serious (not usable)
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
– Resistance to hydrocarbon.
Mechanical and Electrical Properties
Mechanical characteristics of thermoplastics, such as PA
6.6, and PEEK, are improved by the addition of glass
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.
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.
10
3
10
4
10
5
10
6
10
7
10
8
10
9
10
10
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
Radiation dose γ
rads
Gray (Gy)
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
ASTM D 149 / IEC 60243 kV/mm 15-17 19-25 17.2-24 20 22
ASTM D 257 / IEC 60093 Ω
● cm 5.8x10
15
10
16
10
18
> 10
16
> 10
16
ASTM D 257 / IEC 60093 Ω 10
12
10
15
10
17
> 10
16
> 10
15
ASTM C 177 W/K ● m 0.21 0.25 0.23 0.24 0.35
IEC 60112 V CTI 600 CTI 150 CTI 500 – –
ASTM D 150 / IEC 60250 – 4 3.2-3.5 2-2.1 2.1 3.6
ASTM D 150 / IEC 60250 – – < 0.005 < 0.0003 < 0.001 < 0.0034
UL 746 °C 120 250 260 200 350
– °C 150 300 300 260 480
– °C – -55 -200 -200 –
ASTM D 570 / ISO R624 % < 0.7 < 0.3 < 0.01 < 0.01 0.24
– Gy 5x10
3
10
7
2x10
2
2x10
4
10
6
ASTM D 635 / UL 94 – – V-0/3.2 V-0 V-0 –
Standard Units PA6.6 PEEK PTFE FEP PI
Technical characteristics
Designation
chemical commercial
Polyamide (glass fitted) Nylatron
®
Polyether Ethercetone Peek
®
Polytetrafluorethylene –
Tetrafluorethylene –
Polyimide Vespel
®
PA 6.6 – ●● ●
PEEK –
● ● ●
●● ●●●●●
PTFE ASTM D 1457-83 ●●●
FEP ASTM D 2116-81
● ●
PI –
● ●
Unipole Multipole
00 S E 00 S E B K 2C 2G 1D
Symbol Standard
● First choice alternative
●
Special order alternative
Note: values of insulation resistance between contacts are given on page 177.