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Test Methodology for Polyethylene Seals

11/17/2010 5:05 PM

I am in the process of developing a repeatable test standard for testing seals of 1.5-2.0 mil LDPE. These seals are manufactured with a hot press and have a tendency to be variable if the manufacturing process is deviated from. In thinking through the development of the test standard, it appears as though suspending a sample in a fixture and attaching a weight to the opposite end will allow me to perform a "snap" test by dropping the weight in a controlled manner.

My questions are:

-Is there a current ASTM standard (I've searched with zero results) that might reference a test similar to this?

-In application, is the "snap" test the most repeatable test that could be conducted?

-I will be required to test samples along a radius, will a deviation in setup or methodology be required?

As always, time is of the essence since they wanted this yesterday. Thanks in advance for all of your help

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#1

Re: Test Methodology for Polyethylene Seals

11/18/2010 11:22 PM

Your weight-dropping concept does smack - to an extent - of a Charpy impact test. The ASTM has some recent revisions that could possibly be useful. An example:

ASTM F2231 - 02(2008) Standard Test Method for Charpy Impact Test on Thin Specimens of Polyethylene Used in Pressurized Pipes

is worth a look to see if you could use it.

Mark Bingham
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#2
In reply to #1

Re: Test Methodology for Polyethylene Seals

11/19/2010 6:33 AM

Thanks Mark, I will take a look at it.

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#3

Re: Test Methodology for Polyethylene Seals

11/19/2010 7:51 AM

Please let us know what you are attempting to test the product for. Do you want to perform a leak test, static strength test, dynamic strength, etc.?

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#4
In reply to #3

Re: Test Methodology for Polyethylene Seals

11/19/2010 8:16 AM

We are using a hot press and dyes to place seals on different widths of tube stock. Our seal parameters are 300 F with a 4 second dwell.

We are trying to further determine a quantifiable method in which we can have our manufacturing department test the seals to ensure that our quality standards can be met.

Ideally, we would like to utilize a pressure test to verify seal quality, but in the short term we are looking at attempting to utilize a seal strength test of sorts.

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#5

Re: Test Methodology for Polyethylene Seals

11/19/2010 9:44 AM

You might take a look at ASTM D2000 and the associated test methods.

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#6
In reply to #5

Re: Test Methodology for Polyethylene Seals

11/19/2010 12:25 PM

Thanks! We found some methods we are looking into.

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