In 1979 tests were run on various brands of food storage. In many products, the nitrogen was leaking out of the cans, after canning. This was true of all of the companies tested, including some of the Perma-Pak foods. The quality control technicians devised methods whereby this problem could be eliminated. We know of no other company in the industry that has devised these tests and made these adjustments in their canning procedures.
Recent tests indicate the problem still exists with other companies.
To insure that the canning continues to be done properly, many cans daily are run through several rigorous tests to insure that the canning seal is totally intact. In addition, products are saved for evaluation at a later date. When the foods are canned, special gauges are maintained on the nitrogen chamber. Not all products are packed with the same amount of nitrogen- Tests are made on a frequent basis to insure the nitrogen canning process is working effectively. This testing is often done on one out of every 20 cases.