Know-How - Materials

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Published: 12/28/2012

Dimensional Stability After Molding: Part 1
The degree to which molded parts shrink as they cool is largely dependent upon the composition of the material being processed.

Published: 11/28/2012

Is It Glass Filled or Glass Reinforced?
Here is how to tell the difference.

Published: 10/26/2012

PBT & PET Polyester: Part 2 The Performance Factor
All things being equal, PET will outperform PBT mechanically and thermally. But the processor must dry the material properly and must understand the importance of mold temperature in achieving a degree of crystallinity that allows the natural advant...

Published: 9/29/2012

PBT and PET Polyester: The Difference Crystallinity Makes
To properly understand the differences in performance between PET and PBT we need to compare apples to apples—the semi-crystalline forms of each polymer.

Published: 8/27/2012

How Do You Like Your Acetal: Homopolymer or Copolymer?
Acetal materials have been a commercial option for more than 50 years.

Published: 7/30/2012

Use MFR Cautiously with Filled Materials
If melt flow rate tests are used to evaluate the effect of processing on the average molecular weight of the polymer, the applicable rules must consider the contribution of the filler to the test result.

Published: 6/26/2012

When It Comes to Nylon, Don’t Do the Math
Chemistry is seldom as simple as it looks. Polymer chemistry takes the complexity up a notch. Nylon chemistry is about much more than doing the math.

Published: 5/29/2012

Density & Molecular Weight in Polyethylene
This so-called 'commodity' material is actually quite complex, making selecting of the right type a challenge.

Published: 4/26/2012

Biopolymers: Time to Take A Deep Breath
Are we looking at all of the implications associated with developing this new 'crop' of polymers?

Published: 3/26/2012

Working with Color Concentrates
Industry needs more development of enhanced-mixing screws.