borosilicate glass and pyrex glass

borosilicate glass is general type of glass have high resists on chemicals and acid degradation

     Pyrex is just a brand name. there many borosilicate glass use it by other names. Pyrex was traditionally made of boro-silicate glass, and was produced by a division of Corning called the Consumer Products Company. That division was spun off by Corning to Borden (of dairy products fame) in 1998. Along the way, the composition of Pyrex glass changed from boro-silicate glass to soda-lime tempered glass. The original boro-silicate formula was not tempered, nor was it necessary. Soda-lime glass is less costly to produce, but was considered to have most of the attributes of boro-silicate glass. Consumer breakage issues with the newer formulation have brought about an active market for “vintage” Pyrex, or products made before the formula shift. So, newer Pyrex in the U.S. is not boro-silicate. However, during that “spin off’, the rights to produce Pyrex brand products in Europe and parts of Asia, were sold to the Newell Company (now called Newell Rubbermaid). They do produce boro-silicate Pyrex. If you are trying to find Pyrex in the older formulation, you might find them on-line from European sources. The difference will be in the logo. In Europe, it is PYREX. All caps. In the U.S. it is Pyrex

In the same way people use the word hoover for a vacuum cleaner, ie “I'll meet you for coffee when I've done the hoovering”. Pyrex is often used to describe borosilicate glass or more recently tempered soda-lime glass even though it might not actually be made by Corning Consumer Products Company, the company who own the trademark ‘pyrex’ .

Pyrex is often used to describe any high temperature glass labware or oven proof glass kitchenware made by anyone and pyrex is a trademark for the  only particular glassware items made using borosilicate glass.

Now days there alot pyrex glass pipe but without label, they are just ordnarily glass pipe.