Two Letters Re: Some Home Chemistry Tricks of the Trade
James, Just a quick note. [In his article on home chemistry,] RPM suggests acquiring some Pyrex measuring cups and bowls for handling hot liquids & mixtures. Pyrex is no longer made from the low thermal expansion Borosilicate laboratory glass. The trademark name was sold to a Chinese firm and the glassware is now made from regular soda lime glass [you can tell from it’s bluish tint] – and may shatter from rapid changes in temperature. People around the country are being injured from the “new” Pyrex as it literally explodes on their stovetops. This is corporate greed at it’s finest! …