Borosilicate glass is a type of glass with silica and boron trioxide as the main glass forming constituents. Borosilicate glasses are known for having very low coefficients of thermal expansion (~3 × 10−6 K−1 at 20 °C), making them resistant to thermal shock, more so than any other common glass. (from Wikipedia)
Welcome to Cincinnati Gasket and Industrial Glass’ Newsletter. We’ll be publishing application examples and technical information here. Please subscribe if you would like to be notified when we have a new post.
Borosilicate glass glass is less subject to thermal stress and is commonly used for the construction of reagent bottles. Borosilicate glass is sold under such trade names as Simax, Borcam,Borosil, Suprax, Kimax,Heatex, Pyrex, Endural, Schott, or Refmex, Kimble.
Borosilicate glass was first developed by German glassmaker Otto Schott in the late 19th century. Otto Schott is also founder of today’s SCHOTT AG, which sells borosilicate glass under the brand name DURAN® since 1893. Another manufacturer of DURAN® is the DURAN® Group. After Corning Glass Works introduced Pyrex in 1915, the name became a synonym for borosilicate glass in the English-speaking world. However, borosilicate glass is the name of a glass family with various members tailoring completely different purposes. Most common today is borosilicate 3.3 glass like SCHOTT Duran and Pyrex by Corning.
In addition to quartz, sodium carbonate and aluminum oxide traditionally used in glassmaking, boron is used in the manufacture of borosilicate glass. The composition of low-expansion borosilicate glass, such as those laboratory glasses mentioned above, is approximately 80% silica, 13% boric oxide, 4% sodium oxide and 2–3% aluminum oxide. Though more difficult to make than traditional glass due to the high melting temperature required (Corning conducted a major revamp of their operations to manufacture it), it is economical to produce. Its superior durability, chemical and heat resistance finds excellent use in chemical laboratory equipment, cookware, lighting and, in certain cases, windows.
Pyrex (trademarked as PYREX) is a brand introduced by Corning Inc. in 1908 for a line of clear, low-thermal-expansion plastic borosilicate glass used forlaboratory glassware and kitchenware. Pyrex sold in the United States is made of tempered soda-lime glass; outside of North America the costlier borosilicate is still used.
Corning no longer manufactures or markets PYREX-branded borosilicate glass kitchenware and bakeware in the US. World Kitchen, LLC, which was spun off from Corning in 1998, licensed the pyrex (all lower case) brand for their own line of kitchenware products—differentiated by their use of clear tempered soda-lime glass instead of borosilicate.
The European manufacturer of Pyrex, Arc International, uses borosilicate glass in its Pyrex glass kitchen products; however, the U.S. manufacturer of Pyrex kitchenware uses tempered soda-lime glass. Thus Pyrex can refer to either soda-lime glass or borosilicate glass when discussing kitchen glassware, while Pyrex, Bomex, Duran, TGI and Simax all refer to borosilicate glass when discussing laboratory glassware. The real difference is the trademark and the company that owns the Pyrex name. The original Corning ware made of borosilicate glass was trademarked in capital letters (PYREX). When the kitchenware division was sold, the trademark was changed to lowercase (pyrex) and switched to low thermal-expansion soda-lime glass. The bottom of new kitchenware and old kitchenware can be inspected for an immediate difference. The scientific division of Pyrex has always been using borosilicate glass. (from Wikipedia)
Cincinnati Gasket & Industrial Glass occupies over 65,000 square feet with state-of-the-art machinery and the finest quality inspection. Dependable, quick service, and competitive prices have made us one of the oldest and largest in the field with some of the newest and most innovative ideas in the industry.
We specialize in a wide range of machined glass products for use in nearly every major industry in the world; from the steel and chemical industries to machine tool and power generation. Whether replacing existing equipment or developing a new design, we can provide creative solutions to your industrial glass needs that will help increase efficiency and save countless hours of downtime in years to come. Contact us.