René 41 Wire
(Bare Resistance Wire)
SUPER ALLOY -- ULTIMATE WIRE FOR HOT-WIRE CUTTING
Twice as strong as nichrome wire of the same gauge
retains strength at high temperatures
For hobby, home, work, school, lab, industry
We normally ship same day when order is received by 2:00 pm Pacific time.
The Pkg column below indicates how the wire is wound
27 gauge is the most commonly used for foam cutting
28.5 gauge for a narrower kerf
24 or 25 gauge for long lengths of foam cutting or where even more
strength is desired than for 27 gauge
Rene 41 (René 41) wire is the ultimate material for hot-wire foam cutting and other hot wire applications—there is nothing better. It retains its high strength at much higher temperatures than normal foam cutting temperatures. Its room temperature tensile strength is double that of nichrome wire and it stretches very little as it is heated. People who have used Rene 41 have said it is “unbreakable;” not exactly true but very strong and many have used it for years without breaking it. It is used in production lines cutting foam polystyrene (EPS), thermal laminate and other materials where it is in use continually and also on oscillating cutting frames. It has an excellent track record of durability and long life in these applications as well as others.
Because this wire retains its strength at very high temperatures, it can be run at higher temperatures for cutting and so cut faster. Also because of its strength, it can be used in longer lengths without needing to increase the diameter which would be required with nichrome. This means increased speed and smaller kerfs and so less waste. The 27 gauge will work for almost any length but if even more strength is needed or for rougher handling you can use either the 25 or 24 gauge. The 27 gauge is used commercially to cut 4 ft square by 12' long billets of foam and in NC foam cutting machines. Some people prefer the higher speed and smaller kerf obtainable with the 28.5 gauge (0.012" dia) wire.
Rene 41 is one of the alloys in the group called superalloys or high-performance alloys and was developed by General Electric for use in the aerospace industry. It is commonly used in gas turbine engines where its high temperature strength, creep resistance, fatigue life, phase stability, and oxidation and corrosion resistance makes it an ideal material for the application. Other examples of superalloys are Hastelloy, Inconel, Waspaloy, Haynes alloyes, Incoloy and others. These alloys are also used in power generation, space vehicles, nuclear reactors, bomb casings, chemical processing vessels and many other uses.
If you are using cutting wire longer than 3 or 4 feet, this wire is recommended, or if you just want a wire that is stronger and will last longer, then Rene' wire is recommended.
This wire is tempered unlike nichrome which usually is annealed. This means that it is stiffer and springs back more than nichrome of the same diameter.
The resistance if René wire is about 10% higher than nichrome wire. You can still use the nichrome wire calculator --using 28 gauge nichrome will give you close to the same electrical requirements as for 27 gauge René.
The Certificate of Conformity for this wire lists the following:
Density: 8.25 g/cm3 (0.298 lb/in3)