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MATERIALS: Performance in Polyethylene: Density Matters: Part II
Remembering the case of the failed gas tanks.
Columns Published: 7/28/2014
MATERIALS: Performance in Polyethylene: Density Matters
In polyethylene, density provides another mechanism to control properties. But it must be specified properly.
Columns Published: 6/19/2014
MATERIALS: Melt Flow Rate Testing—Part 10
Two areas where the melt flow rate test it is not useful are related to processing.
Columns Published: 4/23/2014
Melt Flow Rate Testing—Part 9
Understanding the value of melt-volume rate.
Columns Published: 3/21/2014
Melt Flow Rate Testing—Part 7
Here is why the melt flow test is not universal.
Columns Published: 1/23/2014
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 proc...
Columns Published: 12/29/2013
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.
Columns Published: 11/26/2013
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.
Columns Published: 10/24/2013
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.
Columns Published: 9/23/2013
Melt Flow Rate Testing – Part 2
To fully appreciate the strengths and weaknesses of the melt-flow-rate (MFR) test it is important to know something about the way the test is performed.
Columns Published: 8/26/2013

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