Suggestion to acrylonitrile butadiene styrene (abs plastic)  

Posting by mike on April 17, 2008 at 14:43:25.

am looking for helpful suggestions for a good alternative to our current Acrylonitrile Butadiene Styrene (ABS) material that is failing, probably due to plastic fatigue / mechanical ageing.

Our current part is failing in the processing field after three to six months of use. The material failure is a fatigue failure very near the pivot pin of a trigger. The polymer surface shows typical clamshell pattern failure and it is slightly polished where the break starts and white/grey where it the break ends.

We used a Polycarbonate - Acrylonitrile Butadiene Styrene blend on a prior version of the part and by going to the Acrylonitrile Butadiene Styrene (Entec-Resins, type 756) almost doubled the life using our stress test jig.

Shrink rate may not be totally critical so I am open to going away from the ABS solution.

What are my options?
Glass filled ABS
Nylon
PP

Many thanks for your help!

          follow up posts
    On 04/17/2008 composite agency posts: Mike,

    There are several other options, but from your list we would surely advice to use Polyamide (Nylon). The work of fracture for Polyamide in dry conditions is around a factor 50 higher than for Acrylonitrile Butadiene Styrene.

    If a lot of a moisture is present, the performance of Polyamide is less, but still much better than ABS. Please inform us if you need a more quantitative answer.

    Regards,
    Sijmon van der Wal
    Composite Agency
    [responses: 0]


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