[Jewelry making - Article 01696] - Re: [Orchid] Making holes in a plastic tube

[Al Balmer]

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    Test a piece first. Liquid nitrogen will indeed harden flexible
    plastic, but the tubing may be easily shattered while cold,
    especially if you're trying to drill it. 

    I worked for a research lab where the boss used vinyl tubing to
    demonstrate the effects of liquid nitrogen to visitors. A second in
    the flask, then rap it against the bench. It would shatter in a
    hundred pieces. Being something of a joker, he usually concluded his
    talk on the dangers of the stuff by dipping his hand in the Dewar
    flask and flinging a handful at them. (Safe enough - it forms an
    insulating layer of gas instantly.) 

Al Balmer
Sun City, AZ
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