This is one of our most common questions asked by our brand-new and long term clients, and is a bit difficult to quickly. All Delrin is Acetal( POM ), but not all Acetal is Delrin. Just like all Fords are vehicles, not all cars are Fords. The name Acetal is a generic call out for the resin, and not all Acetal is Dupont Delrin. Several manufacturers make Acetal resin, including: BASF, Celanese, Ticona, Sabic and a lot more Globally. The homo-polymer Acetal resin produced by Dupont and is called Delrin.
The generic Acetal handles both the homo-polymer and the co-polymer grades of resin. Both materials meet the basic provisions of the ASTM-D-4181 classification. Homo-polymer is listed under POM 111, and Co-polymer is POM 211. Both of these resins are very tough and easily machinable, and they are extremely similar physical properties. They look the same, but in practical use there are a few differences that may make one better than the other, and it depends heavily on your application. As with all plastic materials, check the physical properties and data sheet for the applicable properties you may need for your application. We will also be happy to provide a test piece for your testing. An additional difference is the inherit problem of center-line porosity in the homo-polymer points. This visible center-line is caused by out gassing during manufacturing, and is generally found at the center or on the surface of all homo-polymer extrusion. This porosity can cause problems with machining or moisture permeation through the material. The co-polymer resin does not have this porosity issue. Some of the other differences are currently under physical properties of the resin. Review the chart for some of the most popular properties people ask for when looking at this industrial and mechanical substance. Material is available as Delrin Rod, Acetal Rod, Delrin Delrin Blocks, Acetal Block, Delrin Sheet, Acetal Sheet, and Slabs. One of "the worlds largest" widely available and used plastics, especially on the West Coast (for some reason the East Coast customers prefer Nylon - Polyamide material more). Most commonly offered in Natural (White) or Black, but can also be produced in a broad range of colors with minimum orders. This enables substance matching your product color or for easy identification of parts.
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November 2018
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