Posted by Dr. Walt on September 02, 2013 at 03:24:11 from (12.2.223.79):
In Reply to: Ot canning question. posted by JayinNY on September 01, 2013 at 17:44:04:
Jay:
Commercial (non-canning) glass jars are fine for COLD canning, ie: Pickles, etc. where you don't have to boil them or pressure cook them. As others have said, the glass is thinner than your normal canning jars such as Ball / Mason / or Kerr; but the major difference is in the glass itself, the commercial glass is missing one key ingredient - Colemanite. While Ball / Mason / Kerr jars are not Pyrex glass, they do have minute amounts of Colemanite in the glass to allow them to withstand extended boiling and pressure canning.
Colemanite is a Calcium/Sodium Borate mineral that has a high coefficient of thermal expansion and when added to glass or ceramic materials in minute quantities gives the glass or ceramic materials the ability to withstand sudden extreme temperature changes. That's why you can take "Corelle" cookware right out of the freezer and put it in the Microwave without it shattering. Colemanite is also used in many other products such as Owens-Corning "Pink" Insulation, Pyrex Glass, the ablative tiles on the Space Shuttle, glass automotive headlights, eyeglasses, medicines, paints & coatings, and even for nuclear radiation shielding.
There are only TWO known deposits of Colemanite of commercial size in the world today, Death Valley, California and the country of Turkey. I worked as a Union Certified Top Millwright / Senior Underground Mine Maintenance Mechanic for the American Borate Company at the Billie Mine in Death Valley, Calif. - the LAST operating mine in Death Valley National Park.
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