In note that this product is peroxide cured silicone and not platinum cured.
I had to look into it a bit as I have heard these terms for a good while...particularly platinum cured...but never understood the distinction.
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Peroxide vs. Platinum Cured Silicone Tubing – What’s the Difference?
December 9, 2013
tags:
Silicone Tubing,
Single-Use Components
With silicones, there are two major cure systems, addition cure and free radical cure. From here, we get our two major flavors of silicone tubing: platinum and peroxide cured, whose differences will be the focus of this post.
Addition cure systems make use of vinyl-functional polymers and a catalyst, such as platinum, to jump start the reaction (most cure methods will use either an organo-metallic complex or a platinum salt). The chief advantage of addition cure systems is that there are no by-products which can leach from the final polymer. Cost of platinum catalyst, however, is higher than in other cure methods which is reflected in final product prices.
Free radical cure systems are some of the oldest cross linking chemistries around. Commonly called “high temperature vulcanization” or HTV, this cure system uses free radicals generated by organic peroxides. The oxygen-oxygen single bond in a peroxide is not very stable and degenerates rapidly at elevated temperatures, creating free radicals which initiate the crosslinking of silicone monomers. In this type of cure system, by-products generally remain in the form of volatile organic acids. In order to remove these by-products, a high temperature post-cure is necessary. Any material left in the tubing as the cure that is not an intricate part of the tubing can be a potential leachable or extractable.
"The chief advantage to platinum cured silicone products are the extremely low levels of extractables and leachables. While post-cure methods are effective in reducing levels of siloxanes present in peroxide-cured methods, some organic acids remain."
https://hollandaptblog.com/2013/12/...m-cured-silicone-tubing-whats-the-difference/