ADVANTAGES
APPLICATIONS
SPECIFICATIONS
SIZE TABLE
WHAT IS TWS?
ADVANTAGES OF TWS
ORDERING INFORMATION
WIRES PER U.S.A. MIL-W-16878
ADVANTAGES
APPLICATIONS
SPECIAL EQUIPMENT WIRES
QUALITY FEATURES
CAUTION
ADVANTAGES OF TWS
LIST OF MIL-W SPEC SHEETS
CONDUCTOR SIZE TABLE
INSULATED WIRE SIZES
COAXIAL CABLES PER MIL-C-17
TABLE OF COAXIAL CABLES
MULTI-CORE CABLES
HIGH VOLTAGE WIRES & CABLES
HVCR SELECTION GUIDELINES
HVCR QUALITY ASSURANCE
HVCR SIZE TABLE
HEATING WIRES
WIRES FOR FLOOR HEATING
TECHNICAL ADVISORY SERVICE
QUESTIONNAIRE FOR HVCR
PROPERTIES OF PTFE
COLOUR SCHEMES
APPROVALS
COMPANY PROFILE
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PTFE
Insulated
wires and cables are divided into six sub-groups according to the
construction
and applications. The common features are:
Conductors
- Silver
Plated
Copper (SPC) for use up to 200°C (minimum 1
micron
silver coating as per ASTM-B-298)
- Nickel
Plated
Copper (NPC) up to 260°C (minimum 1.25 micron
nickel
coating as per ASTM-B-355)
- Silver
Plated
High Strength Copper Alloy (SPHSCA) for mechanical strength in fine
cross-sections
and for superior flex-life (somewhat lower conductivity than copper)
generally
as per ASTM-B-624
- Pure
Nickel
for use up beyond 260°C; very high resistance
to
corrosion; DC resistance about 6 times that of copper at 20°C
- Resistance
alloys for Thermo-Couple applications
- Silver
Plated
Copper Clad Steel (SPCCS) commonly used for RF coaxial cables) as per
ASTM-B-501
- Spiral
multi-strands
on glass-fibre cord for high linear resistance -- generally for heating
applications
- Plain
copper
or Tinned copper can not be used due to high-temperature processing and
applications;
tin melts and flows into the interstices of stranding to make the
conductor
inflexible; copper tends to oxidize and become brittle
Sizes/Strandings
- Single
strands
from 0.05 to 1.02 mm (0.002" to 0.040"), or more
- 7,
19, 37,
61 true concentric strands, or 133 strands rope-lay (19 x 7)
- Even
AWG sizes
from AWG 34 to AWG 6 (AWG 4 under development)
- Odd
AWG sizes
and other type of strandings/bunchings also available
- Integrated conductor facility ensures
tighter
control on resistance, diameter, finish etc.
- For
further
details, please refer to size table
Insulation/Dielectric is always PTFE (Poly Tetra Fluoro
Ethylene
C2F4) which is the safest, cleanest, and most
stable
fluoro-carbon. Click here for Properties
of
PTFE. Multi-lap tape-wrapped sintered for
- 250
V AC RMS
(so called Type ET with nominal 0.17 mm radial wall thickness in 3
layers)
- 600
V AC RMS
(Type E, 0.25 mm - 0.010" - nominal radial wall)
- 1000
V AC RMS
(Type EE, 0.38 mm - 0.015" - nominal radial wall)
- For
further
details, please refer to size table
Compounded
PTFE for
High Voltage Cables; Sandwiched Polyimide (Kapton ®) Film for
protection
of PTFE from radiation.
Colours are 10 standard
electronic
as per MIL-STD-104, plus shades and stripes; details
here
Metal Shields/Sheaths
- Round
wire silver
plated copper (SPC) or nickel plated copper (NPC)
- SPC
or Plain
Copper Flat Foil
- SS
wires
Shielding
methods
- Braided
- Served
for
lower overall diameter, especially for triaxial constructions
- Aluminised
Polyester Film with drain wire (not compatible with PTFE jackets)
- Combination
of Flat foil with round wire braid or Aluminised Polyester with round
wire
braid
Jackets/Outer
Coverings over shields are mainly of PTFE
(upto
12 mm OD); larger sizes are difficult with PTFE. PVC or Silicone
Varnished
Fibre Glass or Polyurethane are available for such cases (or otherwise).
For Free Design Service, Contact:
mukul@druflon.com; druflon@gmail.com; nkrishna@druflon.com
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