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Join Date: Aug 2009
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Obviously you are trying to rule out the best materials which are polypropylene and polyethylene by virtue of the 330 F minimum temperature. The other hinge materials that we would suggest are in the $2.50 - $3 range. Something like Dupont Hytrel 7246 is the second stiffest polyester copolyester that works good. There are Arnitel grades that are similar in performance and cost. However, with proper hinge design, you can do pretty well with just PA6, PA66 or PBT. The basic materials can do alright and we would recommend moisture conditioning the PA6 or PA66 parts. Since moisture would affect performance on the rest of your part, that would be the decision on whether you need to use PBT for consistency or PA to take advantage of its worst case properties. To add even a little bit more toughness to the PA66, we would suggest Dupont Zytel MT409. The attached hinge materials (We would need to email this to you if you are interested) shows a list of materials compared equally. Go down to the line for Nominal Tensile Strain at Break at 23C. You will see the difference between wet and dry PA66 as well as between the different products. Go down to the ISO data for Notched IZOD Impact at 23C and you will see which materials are better for poor design. The unfilled PBT is the worst as well as the dry PA66 so those require better technique.
The Nylene materials mentioned are close to Zytel ST801 which is a very tough and hingeable material. It just depends on how flexible you want the parts to be, so that would have to be another question to aid in material sellection.
The properties of Nylene and Eastman products are also attached (We would need to email this to you if you are interested).
I hope this helps.
Umberto Catignani
Gary Casterline
Orbital Plastics Consulting, Inc
Umberto Catignani
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