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H O O K - U P A N D LE A D WIRE 152

Technical Information
Conductor and Insulation Materials

Tough Cables for EPDM Silicone Rubber
Tough Environments
EPDM (ethylene-propylene diene monomer) Braidless silicone lead wire features easy
The technical information provided in is a chemically cross-linked elastomer and clean stripping without the problems
this section has been expanded to include with excellent flexibility at high and low associated with glass braid lead wire. It has
additional graphs and supplementary data temperatures (+150°C to -60°C). It has excellent physical and mechanical strength
as an aid in specifying the hook-up and lead good insulation and dielectric strength, properties. It is recommended for high-
wire best suited to the needs of a particular as well as excellent abrasion resistance and temperature applications in motors, lighting
application. If you require additional mechanical properties. EPDM also has better fixtures, clothes dryers, stoves, therapeutic,
technical information, contact Belden cut-through resistance than silicone rubber, and electronic devices. Varnish compatibility
Technical Support at 1-800-BELDEN-1. which it replaces in some applications. should be checked before production. Some
rigid varnishes may cause cracking when the
The tables on the following pages are EPDM is compatible with most varnishes.
offered as a guide to assist users in selecting After the dip and bake cycle, however, the wire is severely bent.
the correct lead wire for their application. varnish tends to adhere to the insulation Silicone Rubber — Glass Braid
because EPDM, unlike some rubber
Conductors The silicone insulation strips clean and
insulations, does not exude oils or waxes.
easy. The glass braid provides additional
Uni-Strand ® As the lead wires are pulled apart for abrasion resistance and is treated to
Uni-Strand tinned copper conductor. In this termination or flexed, the varnish cracks, prevent fraying. Recommended for high-
type of construction, the bare copper wires sometimes tearing the insulation. temperature applications in motors, lighting
are stranded, then tinned to coat the strands To help this problem, a stearic solution fixtures, clothes dryers, stoves, therapeutic
and also to fill in the interstices between is applied to the lead wire during the and electronic devices.
strands. This allows for easier wire stripping manufacturing process. However, many
with no re-twisting operation. varnishes may still bond to the insulation PPO
unless other special coatings are applied. Polyphenylene oxide (PPO) has superior
Insulation Materials
(Other slip coats are available at additional dielectric properties to enable a thinner
PVC cost.) Because most cleaning processes will wall thickness and an outside diameter
remove these coatings from the EPDM lead that is up to 45% smaller and significantly
Vinyl plastic insulation is fast stripping, and
wire, cleaning EPDM lead wire before using lighter than conventional PVC-insulated wire.
resists oil, solvents, and ozone. The colors
in the process is not recommended. PPO-based wires offer the same electrical
are bright and remain distinct after properties as PVC wires with a voltage rating
processing. Applications include motors, Due to the above, it is recommended that of 600V. Strong and flexible, PPO offers
transformers, fluorescent ballasts and the compatibility between the individual 10x the abrasion and pinch resistance of
fixtures, switchboards, panels, controls, lead wire size, the bake/varnish process PVC. In addition, PPO insulation contains
rectifiers and electronic circuits. Meets and varnish used always be checked and, no halogens, phthalates, or heavy metals,
VW-1 Vertical Wire Flame Test in many cases. if possible, do not allow any varnish to allowing it to be burned or easily recycled.
extend beyond a point where the lead
TFE wire will be flexed or bent.
TFE is a fluorinated thermoplastic with
XL-DUR ®
outstanding thermal, physical, and electrical
properties. TFE is generally restricted XL-DUR is a lead wire insulation using
to applications requiring its special thermoset, chemically XLP. Because of its
characteristics because its basic resin and excellent physical and electrical properties,
processing costs are relatively high. XL-DUR is highly desirable for a wide
variety of applications.
Belden Teflon wire products are highly
recommended for miniature cable CSPE
applications because of their superior
Chlorosulfonated polyethylene insulation
thermal and electrical properties. Teflon
has excellent heat resistance, color stability
is especially suitable for internal wiring-
and electrical properties.
soldering applications where insulation
meltback is a specific problem. Belden
Neoprene
wiring products insulated with Teflon
are outstanding in their resistance to oil, Neoprene insulation has good heat aging
oxidation, heat, sunlight and flame; and characteristics and is an excellent motor
also in their ability to remain flexible at low lead wire. It may be considered for use in
temperatures. They have excellent resistance hazardous locations and is being used in
to ozone, water, alcohol, gasoline, acids, explosion-proof motors recognized by UL.
alkalis, aromatic hydrocarbons and solvents.

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