As usual, I asked my packaging engineer (now retired and a consultant - but he still gives me free consults) husband about the Capitol Vial products (http://www.capitolvial.com/news/news.aspx). His response:
THe products should be ok. Polypropylene is a good clean material without additives in the molding grades. Extensively used in medical devices. The only issue is that PP becomes brittle at low temperatures - frozen containers may break if dropped. At room temperature they are good and may also be boiled and low temperature autoclaved.
Jeanette Panchula
California
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