Dual wall construction Spec 44 600, 1000 and 2500 voltage rating Wire and cable Small size, light weight Low smoke and low corrosive gas generation Resistant to most chemicals and electrical arc tracking Spec 44 wire has a dual wall to handle and install using conventional Spec 44 wire is offered in a wide range construction which combines the tools. of sizes in both stranded and solid outstanding physical and electrical Originally developed for aerospace and conductors, standard materials characteristics of radiation crosslinked military requirements in applications of available being tin or silver-plated polyalkene with the excellent high density and complex circuitry, Spec copper and high strength copper alloy. mechanical and chemical properties of 44 wire and cable now finds wide use Voltage ratings of 600, 1000 and 2500 radiation cross-linked polyvinylidene throughout industry, in commercial and volts are available as standard. fluoride (PVDF). military electronics, avionics, on Shielded and jacketed versions include The result is a wire insulation system satellites, aircraft, helicopters, ships, single and multi-conductor that offers a 150 C temperature rating, trains, and offshore platforms where constructions and flat braid shields small size, light weight,solder iron environmental conditions demand where further size and weight savings resistance, and resistance to most consistently reliable performance. In are achieved. solvents, fuels and lubricants. Spec 44 airframe applications Spec 44 wire and cable is highly flame retardant, constructions can offer a modern non-melting, does not cold flow, and dimensional replacement for PVC/ though mechanically very tough, is easy Nylon/Glass braid type wire and cables. 44 wire Conductor Primary Insulation - Jacket - Radiation Crosslinked, Radiation Crosslinked, Extruded Polyalkene Modified PVDF 44 cable (twisted pair) Specifications/Approvals Mil-W-81044, Mil-C-27500 (Cables) and Mil-C-7078 (Cables) Def Stan. 61-12 Part 18 Issue 3 - Type 1 pliable (Maintenance Range) Def Stan. 61-12 Part 26 VG 95218 Parts 20, 21, 22, 23 and 1000 MSV34401 NATO Stock numbers (NSNs) exist for most standard constructions Civil Aviation Authority Accessory Approval E11623 TDE 74/P/74 and TDE 75/R/6 (British Rail) Lloyds Register of Shipping NASA Preferred Product List Raychem Specification 44Spec 44 Physical characteristics Small size 44A0111-22AWG equipment wire For details of appropriate tools see Spec 44 equipment wire, 600 volt rated 4.62 grams/metre max separate wire handling guide. The tin- has a 0.19 mm nominal wall thickness 22AWG PTFE equipent wire, plated conductor usually specified is compared to 0.25 mm and 0.38 mm for MIL-W-22759 easily soldered or crimped. The equivalent PTFE and PVC wires in MIL- 5.54 grams/metre max insulation may be hot stamp marked W-16878, MIL-W-22759 or BS G210. or printed and does not need etching General handling before potting. Light weight The flexibility of Spec 44 and the ease Because of the thin wall and low density with which it takes a set makes it one Lengths of the insulation materials considerable of the easiest of the high performance Spec 44 is available in long continuous weight savings are made over similarly wires to install. Stripping is done with lengths and can be supplied for use on rated PTFE wires, eg:- conventional die blade strippers. automatic cut and strip wire preparation machines. Typical properties Temperature rating -65 C to +150 C Voltage rating (thin wall) 600 V Voltage rating (thick wall) 2500 V 2 Tensile strength and elongation of insulation 30 N/mm , 230% Notch propagation, 0.05mm notch Pass Solder iron resistance (370 C, 1 minute) Pass Shrinkage, 200 C <1% Low temperature bend -65 C Voltage withstand (thin wall) 2500 V Insulation resistance (20 C) 1500 M ohms for 1 km Resistance: fuels, oils, solvents Pass Environmental performance Temperature rating Solder iron/Overload resistance Voltage ratings Spec 44 wire and cable is rated for The radiation crosslinking of the Standard available voltage ratings for continuous operation from -65 C to materials used in Spec 44 makes them Spec 44 wire are 600 volts (0.19 mm +150 C and for short periods at non-melting at high temperature. As a wall thickness), 1000 volts (0.28 mm temperatures as high as 300 C. Heat result Spec 44 wire is resistant to wall) and 2500 volts (0.48 mm wall). ageing tests are routinely performed at prolonged contact with solder irons and Electrical arc track resistance temperatures of 200 C (168 h) and is resistant to current overloads which Spec 44 insulation demonstrates a total 300 C (6 h). In addition Spec 44s would melt most thermoplastic resistance to arc tracking under both insulation will not shrink back under insulations. wet and dry conditions at aircraft repeated cycling. Chemical resistance system voltages. Mechanical performance The irradiated dual wall construction of Low outgassing Spec 44 wire provides better cut through Spec 44 wire is highly resistant to many For use in space applications, special resistance than some wires with much acids, alkalis, hydrocarbon constructions of Spec 44 wire are thicker walls. 600 volt equipment wire solvents,fuels, lubricants, water and available with low outgassing 44A0111 (0.19 mm wall) has 40% many missile fuels and oxidisers. characteristics, for use in an greater cut through resistance than 600 Cold flow environment of high vacuum and high volt PTFE insulated wire (0.25 mm wall). Radiation cross-linking of Spec 44 temperature. prevents cold flow of the insulation - a recognised problem of some uncrosslinked materials. Fire hazard performance Flammability BS4066 vertical flammability Pass S424 14751 (Swedish chimney) Pass NFC 32070 (2) (French chimney) Pass IEC 332 part 3 (Cable ladder) Pass Smoke/Toxicity Index Smoke Index, Def Stan 61-12 (18) 6 per metre of wire Toxicity Index, Def Stan 61-12 (18) 0.8 per metre of wire Oxygen Index, NES 714 30% Oxygen Temperature Index, NES 715 >300 C