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Published: 1/1/2020

Part 4: Fundamentals of Polyethylene
How the development of new catalysts—notably metallocenes—paved the way for the development of material grades never before possible.

Published: 12/1/2019

Part 4: Polyethylene Fundamentals
Injection molders of small fuel tanks learned the hard way that a very small difference in density—0.6%—could make a large difference in PE stress-crack resistance.

Published: 11/1/2019

Part 3: Fundamentals of Polyethylene
PE parts can fail when an inappropriate density is selected. Let’s look at some examples and examine what happened and why.

Published: 10/1/2019

Part 2: The Fundamentals of Polyethylene
PE properties can be adjusted either by changing the molecular weight or by altering the density. While this increases the possible combinations of properties, it also requires that the specification for the material be precise.

Published: 9/1/2019

Part 1: The Fundamentals of Polyethylene
You would think we’d know all there is to know about a material that was commercialized 80 years ago. Not so for PE. Let’s start by brushing up on the basics.

Published: 8/1/2019

PART 2: The Importance of Mold Temperature When Processing Polycarbonate
Don’t be afraid to increase mold temperature to improve part quality when making PC parts. Take a look at a few examples here.

Published: 7/1/2019

Part 1: The Importance of Mold Temperature When Processing Polycarbonate
An often overlooked factor in optimizing the ductility of PC is the rate at which the polymer is cooled in the mold.

Published: 5/1/2019

Part 5: Heat Deflection Temperature vs. Dynamic Mechanical Analysis
In the final part of this five-installment series, we bring DMA to a practical level using the results for glass-filled nylon.

Published: 4/1/2019

Part 4: Heat Deflection Temperature vs. Dynamic Mechanical Analysis
The presentation of DMA data can sometimes frustrate users and discourage its adoption. Those unfamiliar with DMA should insist on receiving data relevant to the manner in which the part they are developing will be used.

Published: 3/11/2019

Heat Deflection Temperature vs. Dynamic Mechanical Analysis (Part 3)
DMA provides a rich and detailed picture of polymer performance, and it can be challenging to understand all the things that we can and should know about our materials. But the fact that it may be hard does not mean that it should not be attempted.