Materials

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Published: 1/27/2015

MATERIALS: Analysis Gone Wrong
A lot of resources are devoted each year to trying to figure out why products fail. Sometimes it’s because no one involved in a project realizes the data provided was wrong.

Published: 12/29/2014

MATERIALS: The Mystery Of Physical Aging, Part 3
Accelerated aging tests relied on by industries such as medical take into account only chemical aging—oxidation—and ignore physical aging.

Published: 11/24/2014

The Mystery of Physical Aging: Part 2
Dimensional and property changes depend on the size of the part, molecular weight of the resin, and processing conditions.

Published: 10/23/2014

MATERIALS: The Mystery of Physical Aging: Part 1
In polymers, aging is commonly considered essentially synonymous with oxidation. But there are important differences between this type of chemical aging and less commonly recognized physical aging. Let’s unlock the mystery.

Published: 10/23/2014

Check Out the New PTonline.com
Following the relaunch of our print publication and electronic newsletters, our website has a new, vibrant look now, too.

Published: 9/22/2014

MATERIALS: Don’t Guess Your Way through Root Cause Analysis: Part 2
The huge chasm between the laboratory and manufacturing discipline usually does not lend itself to problem-solving. It can be improved with clear communication between the analysis laboratory and the people bringing the problem to the lab.

Published: 8/25/2014

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.

Published: 7/28/2014

MATERIALS: Performance in Polyethylene: Density Matters: Part II
Remembering the case of the failed gas tanks.

Published: 6/19/2014

MATERIALS: Performance in Polyethylene: Density Matters
In polyethylene, density provides another mechanism to control properties. But it must be specified properly.

Published: 4/23/2014

MATERIALS: Melt Flow Rate Testing—Part 10
Two areas where the melt flow rate test it is not useful are related to processing.