I have purchased peel-away molds from Polysciences.  Their number is
800-523-2575.   I believe you can also get them from EMS at (215)646-1566.
There are probably other sources as well that I may have left out.

Cathy

 
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GLP Compliant Laboratory

Cathy A. Mayton
Project Director
Wasatch Histo Consultants, Inc.
www.wasatchhisto.com