Materials Know How

processing tips

MATERIALS: Don’t Guess Your Way Through Root Cause Analysis

More than 50 different polymer test techniques can be used to find root causes of problems. Of these, five or six are fairly common. Use them to take the guesswork out of why a product failed.

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polyolefins

MATERIALS: Performance in Polyethylene: Density Matters

In polyethylene, density provides another mechanism to control properties. But it must be specified properly.

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processing tips

MATERIALS: Melt Flow Rate Testing—Part 10

Two areas where the melt flow rate test it is not useful are related to processing.

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Melt Flow Rate Testing—Part 9

Understanding the value of melt-volume rate.

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Materials

Melt Flow Rate Testing—Part 7

Here is why the melt flow test is not universal.

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Melt Flow Rate Testing—Part 6

Once degradation has been established, the discussion inevitably turns to how it happened. It might be expected that the answer to this question is widely known. Not so. The good news is that the influences that cause polymer degradation during processing are few.

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Testing

Melt Flow Rate Testing—Part 5

There are two points in the manufacturing supply chain where a determination of average molecular weight (MW) is important. The first is when the material is first received by the molder. The second is after molding.

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Testing

Melt Flow Rate Testing—Part 4

Few molders perform the test in-house. Of those that do, most don't understand why they are doing it or what they are measuring.

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Testing

Melt Flow Rate Testing—Part 3

There is a well-established relationship between something called the weight-average molecular weight of a polymer and a parameter known as the zero-shear viscosity.

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