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Re: Extruded Plastic Tolerances
Re: Extruded Plastic Tolerances -- KRP	Post Reply	Top of thread	Forum

Posted by: jalipa ® 09/24/2003, 08:42:34 Author Profile Mail author Edit

There is a German Standard DIN 16901 that cover metric and imperial tolerance for some plastic materials. It should only be used as a guidline tho' The tolerances of a plastic part are affected by it geometery, mould fill direction, mould shrinkage and service temperature. A rule of thumb:- Tolerance = Dimension x shrinkage x thermal Expansion coef. (+ common sense) This gives you an absolute minimum....use the maximum that your tolerance stack up allows. If you need to go under talk to the material supplier and moulder -- then use metal ;-) Note:- with "Thin Wall" technology that is now being used you can have amazingly thin sections, but at a high processing cost....talk to an expert on "thin wall" tolerancing. Hope that helps. J.

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