Know-How - Materials

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Published: 1/1/2019

Part 1: Heat Deflection Temperature vs. Dynamic Mechanical Analysis
Does the industry need a better way of reporting the temperature-dependent behavior of plastics? With DMA, it already has one. But it’s been glacially slow to catch on.

Published: 11/30/2018

Part 11: A Processor's Most Important Job
It’s the processors job to ensure molded parts contain enough stabilizer to perform to the expectations of the end use.

Published: 10/30/2018

A Processor’s Most Important Job, Part 10: Fiber-Length Retention
Glass and carbon fibers are often used to increase material strength and modulus. To maintain these properties, the aspect ratio of these fibers must be maintained.

Published: 10/1/2018

A Processor's Most Important Job, Part 9: Avoid Molded-In Stress
How to establish molding conditions that minimize internal stress in a part.

Published: 8/28/2018

A Processor’s Most Important Job, Part 8: Molded-In Stress
How processing adjustments can control molded-in stress.

Published: 8/1/2018

A Processor's Most Important Job, Part 7: Reviewing Crystallinity
There are several process-related issues that influence crystallinity besides cooling rate. Let’s examine a few.

Published: 6/1/2018

A Processor's Most Important Job, Part 6: Long-Term Effects
The importance of mold temperature to the development of the desired polymer crystalline structure becomes absolutely crucial in the case of high-performance materials.

Published: 4/27/2018

A Processor's Most Important Job, Part 5: POM Polymers
Using a mold temperature above a polymer’s Tg ensures a degree of crystallinity high enough to provide for dimensional stability, even if the part must be used at elevated temperatures. But POM is an exception. Why?

Published: 3/29/2018

A Processor’s Most Important Job, Part 4: Mold Temperature
Engineering polymers require higher mold temperatures to achieve their ideal structure. The temptation to turn down the mold temperatures can hurt part performance.

Published: 3/1/2018

A Processor’s Most Important Job, Part 3: Unintended Consequences
Processors are often expected to compensate for ill-advised decisions made earlier in the product-development process. In the case of shrinkage, one of the most common ‘fixes’ is to simply reduce the mold temperature.