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Barrels are normally made in four materials. Nitralloy nitride, D2, CPM 10V and Carbide. These materials handle just about any resins that can be used in the plastics industry. Nitralloy Nitride is the most common because it is used on all General Purpose application and normally comes standard on all OEM machines. The Nitalloy is very good on any mild material application with out fillers or corrosives.

Barrels made from D2 are also very good for any application but also allows a better protection from pitting caused by PVC or Poly Carbonate. The D2 material will stop the black specking caused by resin sticking that can come from a Nitrided barrel.

CPM 10V like the screw material works very well in higher wear applications such as glassed filled, talc filled or fire retardant materials. The CPM material will give about twice the life of the barrel against the Nitralloy barrel.

Carbide Barrels will again last twice as long as the CPM barrel but at a much higher cost and delivery time. But if you are running 50% Glass filled material and really need the wear protection the carbide is a very good option.

There are spun cast barrels on the market brought in from China and India that you should be very careful of. We have several sitting in our shop that have cracked and or broken in half. They are less money but if they last 6 months and crack or break the 20% you saved will not come close to the cost of buying a new barrel. Always ask if you are getting a spun cast barrel before you buy. You will be happy you did.