Lemo's Environmentally Sealed Connectors - LEMO - (Version JPG) - Page n° 9 - PDF Catalogue | Technical Documentation

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LEMO USA • 800-444-5366 • www.LEMOusa.com

Insulator

Plastic material used by LEMO for manufacturing insulators is selected according to the electric and thermal properties required for the various connector types. Characteristics 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

LEMO uses PEEK (Polyether Etherketone) for the insulator material. The performance of this thermo-plastic material is enhanced by the addition of glass fibers in the resin to achieve very high mechanical strength, to increase dielectric strength and to reduce water absorption rate. The above features of PEEK, plus its excellent chemical and radiation resistance, make it ideal for most applications. Sealing grommets are molded from Viton®. Such polymer has inherently excellent electrical insulating properties which does not change when exposed to adverse environments.

Insulating resistance >10¹²Q (per MIL-STD-1344A method 3003.1).

Radiation resistance

PEEK

PTFE ■

VITON®

rads 10³Gray (Gy) 10¹

10⁴ 10⁵ 10⁶ 10⁷ 10⁸ 10⁹ 10¹⁰10² 10³ 10⁴ 10⁵ 10⁶ 10⁷ 10⁸

Radiation dose y

Minimum to slight (almost always usable) 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, without notice, any material mentioned in the

present catalog or any other publications edited by LEMO SA. and/or

its subsidiaries. LEMO SA and its subsidiaries use only plastic

granules, powder or bars supplied by specialized companies, and thus cannot in any case take responsibility with regard to this material.

Technical characteristics


Type	Standard	Units	POM	PEEK	PSU	PPSU	PPS	PA.6	Silicone	FPM	Epoxy
Density	ASTM D 792	-	1.4	1.3-1.4	1.24	1.3	1.67	1.14	~1.2	~1.9	1.58
Tensile strength (at 73.4° F)	ASTM D 638/ ISO R527	MPa	70-80	92-142	70	70	121	55	> 9	> 12	16
Flexurale strength (at 73.4° F)	ASTM D 790/ ISO R178	MPA	-	170	106	91	179	75	-	-	24
Dielectric strength	ASTM D 149/IEC 60243	kV/mm	60	19-25	17-20	15	17	35	18-30	-	15
Volume resis. at 50% HR and 73.4° F	ASTM D 257/IEC 60093	C • cm	10¹⁵	10¹⁶	5x10¹⁶	-	10¹⁶	10¹⁵	10¹⁴	^-	10¹⁴
Surface resistivity	ASTM D 257	C	10¹³	10¹⁵	-	-	-	-	-	-	-
Thermal conductivity	ASTM C 177	W/K • m	0.31	0.25	0.26	-	0.3	-	-	-	0.8
Comparative tracking index	IEC 60112	V	CTI 600	CTI 150	CTI 150	-	CTI 200	CTI 600	-	-	CTI>600
Maxi. continuous service temperature	UL746	°F	194	482	284	356	428	176	392	392	176
Min. continuous service temperature	UL746	°F	-58	-67	-76	-58	-106	-40	-58	-4	-4
Max. short-time service temperature	-	°F	284	572	320	392	482	302	> 482	572	248
Water absorption in 24h at 73.4° F	ASTM D 570/ISO R62A	%	0.85	0.12	0.3	0.37	< 0.05	> 3	-	-	0.25
Radiation resistance	-	Gy¹)	8x10³	10⁷	10⁵	^-	> 10⁷	5x10³		8x10⁴	2x10⁶
Flammability rating	ASTM D 635/UL94	-	HB	V-0/3.2	V-0/4.4	V-0/1.6	V-0/5V	V-2	-	-	V-0/4
Resistance to steam sterilization	-	-	bad	excel.	good	excel.	excel.	bad	good	good	bad

Notes: ¹⁾ 1 Gy (Gray) = 100 rad

ASTM = American Society for Testing Material UL = Underwriters Laboratories

ISO = International Standards Organization IEC= International Electrotechnical Commission

Note: Values of insulation resistance between contacts are given on page 9.

Data Subject to Change

Lemo's Environmentally Sealed Connectors - LEMO - #9

High-voltage connector, Electrical cable assembly, Plastic connector, Data transmission cable, Audio cable