KNOW-HOW - MATERIALS

Know How

Tracing the History of Polymeric Materials: Part 1

In this series we’ll delve into a discerning look back into the history of our industry and how we all got here.  
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Engineering Resins

Materials: Annealing Tips for Polyamide-imide, Part 7 of 7

PAI is a material capable of achieving levels of performance that even semi-crystalline engineering polymers like PEEK, PPS, and PPA cannot. But you have to be willing to work for that performance, and the annealing process is an essential part of this. 
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Know How

Materials Part 6 of 7: Annealing Tips for Thermoplastic Polyurethanes

TPUs form physical, rather than chemical, crosslinks that can be broken by reheating. Formation of these crosslinks can be sped up by annealing, which improves a variety of properties.
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Know How

Materials Part 5: Annealing Tips for Crosslinked Polymers

As with semi-crystalline thermoplastics, annealing can be used in thermosetting polymers to obtain a level of crosslinking that may not be possible within the molding cycle.
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Engineering Resins

Materials: Annealing Tips for Semi-Crystalline Polymers: Part 4

You can forgo the elevated mold temperatures normally recommended for high-performance semi-crystalline materials. But it’s risky and likely to yield parts that under-perform expectations … assuming that they emerge from the annealing process looking anything like the drawing.
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Know How

Part 3 Materials: Annealing Tips for Semicrystalline Polymers

For these polymers, annealing is done to establish a level of crystallinity that cannot be practically obtained within the parameters of a normal molding cycle. Here’s some guidance on setting annealing time and temperature.
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Know How

Materials: Annealing Tips for Amorphous Polymers, Part 2

In amorphous polymers, annealing is performed to draw down the internal stresses to a level not achievable within the conditions of a normal molding process. But a few parameters are important to achieving the desired results.  
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Heating & Cooling

Materials Part 1: What Annealing Can Do for Your Process

Relatively rapid cooling rates in processing introduce internal stress. If functional problems in use result, annealing may draw down the stress to levels that may not be achievable during processing.
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Know How

Is It Glass Filled or Glass Reinforced?

Here is how to tell the difference.
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Commodity Resins

Polyethylene Fundamentals: Part 6 of 6

Don’t assume you know everything there is to know about PE because it’s been around so long. Here is yet another example of how the performance of PE is influenced by molecular weight and density.
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