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Materials & Assembly
Design Decisions: Resin Choice Is Critical
8/7/2012

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A knit line is any line, visible or not, where two resin flows meet. Depending on the design of the mold and the material being injected, a knit line may present no problem at all, may be a cosmetic issue, or may cause a serious structural problem.
A knit line is any line, visible or not, where two resin flows meet. Depending on the design of the mold and the material being injected, a knit line may present no problem at all, may be a cosmetic issue, or may cause a serious structural problem.

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Dave Palmer
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Platinum
Materials selection criteria
Dave Palmer   8/7/2012 12:14:47 PM
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This is a good introduction to materials selection in plastics.  Another important factor to consider is chemical compatibility.

Most of the factors mentioned here apply in a general sense to materials selection for metals, as well as plastics.

Overall, a very nice article.

NadineJ
User Rank
Platinum
Re: Materials selection criteria
NadineJ   8/13/2012 12:08:00 AM
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I agree.  This is a very nice article.  It's good to revisit.

Dave-that's a good point about chemical compatibility.

Ann R. Thryft
User Rank
Blogger
Re: Materials selection criteria
Ann R. Thryft   8/14/2012 12:24:05 PM
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Thanks for a good overview of this topic. I learned a few things!

Greg M. Jung
User Rank
Platinum
Agency Requirements
Greg M. Jung   9/15/2012 3:12:34 PM
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Good article.  In many electromechanical assemblies, Agency requirements can matter also.  A polymer may be the perfect match for the strength, finish, etc. needed for the product.  However, that particular grade of polymer may not have the flame retardant properties needed to pass 94V-0 at the specified thickness in order to achieve agency certification for the entire product.  It is important to also consider agency requirements up front during product development to make sure the entire product can be certified.

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