MATERIALS KNOW HOW

Materials Know How

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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Materials Know How

Is It Glass Filled or Glass Reinforced?

Here is how to tell the difference.
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Materials Know How

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.
#polyolefins #bestpractices

Engineering Resins

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.

Materials Know How

Part 5 of 6: Fundamentals of Polyethylene

How the development of new catalysts—notably metallocenes—paved the way for the development of material grades never before possible.
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Materials Know How

Part 4 of 6: 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.
#polyolefins #bestpractices

Commodity Resins

Part 3 of 6: 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.
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Commodity Resins

Part 2 of 6: 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.
#polyolefins

Materials Know How

Part 1 of 6: 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.
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Materials Know How

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.