From the PSI workbook, the following special permits are to be condemned:
SP6688 (Norris), SP6576 (Kaiser), SP6020 (Kaiser) and SP890 (Canadian Aluminum). This is nothing new; these permits ran out awhile ago.
E7042, which is Walter Kiddees 6351 alloy, is just fine.
(Article:
http://www.psicylinders.com/library/IllegalCylinders.htm)
To answer some other comments: Youre right, its not going to cost $50 to ship a cylinder, its going to cost about $20, maybe less if UPS will accept a bare cylinder with an address printed on it. This makes a decent deal ($50 off) a mediocre deal and thats what Luxfer is counting on. With several million 6351s in circulation, itd hurt them big time if they offered a good deal.
I believe the new alloy corroding quicker is PSTs 9791 Special Permit/Exemption (steel); at least I know thats the case for the steel alloy used in the 9791 cylinders, but have never heard it about the 6061 AL alloy.
Mike, PSIs VCI stickers REQUIRE the inspectors number to be written on the sticker. Refuse them if they dont have a number.
Roak