Re: Living hinge

From: Rick Harrington (
Date: Thu May 21 1998 - 14:00:28 EEST

Hello Sabino & List,

We have had a lot of good and bad experience with living hinges.

The best method is to machine from polypropylene if the geometry allows.

If not here are a couple of options:

1. Make a rubber tool of part. Make a polypropylene insert and cast in place.
2. We have a modified thermoset that we get pretty good results with. The
cycle is 10 to 50 movements depending on geometry.
3. Use same method as #1 but insert a piece of cloth as the hinge.

Hope this helps

Rick Harrington

At 02:13 PM 5/20/98 -0700, you wrote:
>Has anybody had any experience with prototyping a living hinge either by
>machining or water-jet cutting. The material is polypropylene.
>Specifically how many cycles could you expect from such a prototype?
>Sabino Mata
>For more information about the rp-ml, see

Rick Harrington

Harrington Product Development Center

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For more information about the rp-ml, see

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