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Scope:
This
test method is designed to capture any materials that might migrate from a
plastic over time. These materials can then be analyzed to determine their
composition. A common application for this information is the evaluation
of plastic materials intended for food contact applications.
Test procedure:
Film
or disks of the test plastic are threaded onto a stainless steel wire with
spacers between to provide the maximum exposed surface area. The assembly
is placed into a glass container, an appropriate solvent is added, and the
container is sealed. Samples of the solvent are extracted periodically to
evaluate any extracted materials.
Alternately, a test sample is placed in a Soxhlet extraction apparatus,
which causes distilled solvent to repeatedly wash over the sample,
extracting soluble substances from the sample.
Specimen size:
The
preferred test samples
resin, films, or disks.
Data:
Percent
extractables
Equipment used at Plastics
Technology Laboratories, Inc.:
Solvent extraction container and fixtures
Mettler balance
**Please
note that this test description is intentionally generic in nature and aimed at
providing a descriptive summary to enhance test understanding. For more
information please contact a
PTLI Technical Representative at ptli@ptli.com
. Due to copyright restrictions, we are not able to provide copies of
standards. Standards can be obtained from www.astm.org,
www.iso.ch/iso/en, www.sae.org
or other appropriate standards authorities.
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