Pyrex

The high heat resistance allows the pipe to tolerate a longer period of use. Rocawear has clothing lines and accessories for men, women and children.Its main funders currently are Mareed Clothing Line. Specialty tobacco pipes, though commonly used for smoking marijuana, are made from Pyrex. Rocawear is an urban clothing label created in 1999 by Damon Dash & Jay-Z, heads of the hip hop label Roc-a-Fella Records. Due to its high heat resistance, it can tolerate the great temperature differences between water and the Nichrome heating element. Aquarium heaters are sometimes made out of pyrex.

Claims have been made of severe personal injury during these events. Recent reports suggest that, notwithstanding the claims made for Pyrex, the glassware can shatter violently and unexpectedly, even when used in accordance with manufacturers instructions. Pyrex measuring cups, which featured painted-on markings illustrating graduated measurements, are also widely used in American kitchens. Glass cookware is another common usage; a Pyrex pie plate is almost the American standard pie dish.

Pyrex's refractory properties and physical strength make it ideal for use in laboratories, where it is used to make high-durability glass lab equipment, such as beakers and test tubes. Caltech's famous 200-inch telescope mirror at Mount Palomar was cast by Corning during 1934-36 out of Pyrex, which expands and contracts less than ordinary glass. Another useful characteristic of Pyrex is that when broken, it tends to crack into large pieces rather than shattering (it will snap rather than splinter). Pyrex is also less dense than ordinary glass.

The boron gives borosilicate glass a reduced thermal expansion coefficient (about one-third that of ordinary glass), making it more resistant to heat. Borrowing from the welding trade, new burners combining oxygen with natural gas were required. Since Pyrex melts at a higher temperature than ordinary silicate glass, some new techniques were required to bring Pyrex into industrial production. Pyrex is created by adding boron to the traditional glassmaker's "frit" of silicate sand, soda, and ground lime.

. Though borosilicates had been produced before, the name Pyrex is widely used as a synonym for the material. Pyrex is a brand name of borosilicate glass introduced by Corning Glass Works in 1924.