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Delrin - Does the color mean anything?

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  • Delrin - Does the color mean anything?

    I have been looking at getting some DELRIN. I find white and black mostly, and occassionally find green or blue. I have done a search, but cannot find any mention of color differences and if any effect on properties.

    Can someone provide an Internet pointer (or an answer)?
    Thanks,
    Jim

  • #2
    No difference in my experience - but I have not pushed the material very hard either.

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    • #3
      Jim-
      You can check out McMaster-Carr, search for acetal, (Delrin is the trade name for Duponts acetal). They have a little explanation about different types and what colors they might be. I've personally not seen anything other than white or black but apparently they exist. Acetal is like most other plastics, it could be any color the manufacturer wanted to make it.

      take care
      Bernie

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      • #4
        Delrin is Dupont's trade name for acetal. I use a bit of it at work, mostly black. I have seen blue but never green. There is brown which is PTFE impregnated for reduced friction.

        May find some help here:

        http://www.matweb.com/reference/acetal-polymer.asp

        [This message has been edited by ERBenoit (edited 03-07-2005).]
        Paying Attention Is Not That Expensive.

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        • #5
          DuPont makes two or three dozen grades of Delrin for specific applications:
          http://plastics.dupont.com/NASApp/my...0&locale=en_US
          Barry Milton

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          • #6
            I call the black nylatron the black can be a graphite impregnation to give lubricating properties to the material. Thats what I was told by the sales dude at the plastics shop.

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            • #7
              My plastic supplier says the black is "high lubricity" and the white is "natural" YMMV

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              • #8
                Wait a minute madman. Don't confuse Delrin with Nylatron. They aren't related. Nylatron is often called black nylon even though it isn't black at all but is grey. It is nylon with molybdenum disulphide filler to increase lubricity. There is also available graphite filled nylon which is slightly darker than nylatron but still not black. It has a bit of a swirl pattern to it as well.

                You can also get Delrin filled with 20% Teflon fibers for increase lubricity and wear resistance. Delrin is also available in 20% glass filled which gives it high stiffness, low warpage, and low creep.
                Free software for calculating bolt circles and similar: Click Here

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                • #9
                  Colored Delrin, such as blue, can be very difficult to get and you might need to buy a boatload to have it extruded if you have to repeat parts in that color. Den

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                  • #10
                    Over the years I've CNC machined thousands of pounds of customer supplied acetal.

                    In my experience the natural is not as good a machining type as the black, black seems to chip break easier. My amateur analysis is the black pigment must be a lubricant (graphite?). The local distributor disagrees with my theory about black being better to machine, he says there's absolutely no difference.

                    Another issue is the hardness/brittleness of the material. Some bars with have marking indicating the material is annealed, others have no such markings. I have seen some that's very brittle (not annealed??). IMO, this brittleness that shows up once in a while makes Delrin a bad choice for impact devices like hammer heads, etc.


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                    • #11
                      First, thanks for all the responses.

                      I have looked at the supplied URLs (including McMaster-Carr) and still don't find anything other than white (normal DELRIN), black (enhanced UV resistance DELRIN), and brown (PFTE added DELRIN). The blue and green are offerings on eBay, with no proof of it being DELRIN. I have requested a product spec sheet, but received no response. I'll just pass on these as the intended use is for a distributor cap or two for some small engines I'm building.

                      Again, thanks,
                      Jim

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                      • #12
                        Color can mean a lot. Got some terminal boards once that gave fits with audio cross talk. They were black and partially conductive. Probably graphite. The manufacturer forgot to specify the electrical conductance - or lack thereof. Someone in purchasing thought they would get ahead by finding a cheaper grade. Yea... Saved a lot of money...... He probably made VP. They promote for stuff like that, you know.

                        Paul A.
                        Paul A.
                        SE Texas

                        Make it fit.
                        You can't win and there is a penalty for trying!

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                        • #13
                          I don't mean to hijack this thread but I have a question regarding acetal. At another board it was flatly stated that acetal is unsuitable for exterior automotive suspension bushings as acetal absorbs water. I'm assuming that this would lead to aggravated oxydation of steel components in contact with the plastic. I looked around the website at DuPont, although not thoroughly, and found no mention of this. Any of you care to comment on this as this is news to me. I use acetal in automotive/motorcycle applications sometimes and wondered if I've been introducing a potential problem. The source that flatly stated the absorbtion did have a "solution" in the form of an unamed plastic they sell so this may have been the case of "selling the problem". Thought I would ask some more knowledgeable folks here about this. Many thanks for your replies.

                          [This message has been edited by roninB4 (edited 03-07-2005).]

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                          • #14
                            The difference is lamp black,that's what the Cadillac plastics sales rep told me.

                            The blue/green could be to indicate origin.We used to get nyloc nuts for a Navy contract.Only the American made nuts had colored nylon,all the rest where off white/ivory colored.Made it easy to tell when somebody was cheating.
                            I just need one more tool,just one!

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                            • #15
                              One of the advantages of acetal is that it DOESN'T absorb water much.
                              Free software for calculating bolt circles and similar: Click Here

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