Borosilicate Glass


I love the look of glass and how it captures the light when placed on a table. I especially like how the unique curves are defined when I add my favorite beverage yet, I have always hesitated to purchase a lot of glass items due to the breakage and durability concerns. So, I usually end up settling for Tupperware cups. However, this has changed recently, due to the discovery of borosilicate glass products.

Stronger than conventional glass, borosilicate glass is more durable and is capable of handling a wide range of temperatures from -4F to 300 F. It’s also microwave and dishwasher safe, which is great for everyday use. Since this material can handle extreme heat and cold, it is often used to make laboratory glassware and other scientific instruments. Borosilicate glass has a reduced rate of thermal expansion, which produces a very clear glass, making it a perfect fit for creating telescopes and other high- precision lenses.

Brands that use Borosilicate Glass

This high-end glass is used in many of the products that we sell, here at Whole Latte Love. Teaposy uses this glass to produce their entire line of teapots, cups, presses and warmers. They also incorporate 20% recycled materials into the process. Each piece is hand blown, resulting in totally unique pieces-no two are the same.

In addition to Teaposy,Bodum offers a durable line of double-walled glassware created from borosilicate glass. These cups are perfect for both hot and cold drinks. The double walled glass works as an insulator keeping perfect temperature. When enjoying a hot beverage, you can place your hands on the exterior of cup and not risk getting a burn unlike some glass.

Bonjour also offers an assortment of French presses made from borosilicate glass. The collection includes Bonjour Double Wall Glass French Press and the Bonjour Maximus French Press .

The use of borosilicate glass has been credited to a German glassmaker from the 19th century named Otto Schott. It wasn’t until 1915 that borosilicate glass was introduced into kitchenware under the popular label “Pyrex”.

The glass is created in a two phase process:


Raw materials are added together in accordance to instructions. The glass is placed in large tanks and heated at extreme temperatures over 2,912F. The high temperature melts the ingredients and creates molten glass. The heating process can take up to 24 hours to remove excess bubbles.


The molten glass becomes thick, red-orange syrup when completed. The mixture is now ready for forming. The tank, in which the molten glass is processed, is designed so that the finished product will flow slowly toward the working end of the tank, which is connected to continuous feed forming machines.

Typical machines blow, press, draw, and roll the molten glass into various shapes. The process has to be done quickly because as the material cools it becomes rigid and unworkable.

Glass blowing is used to create thin-walled products like bottles, cups and teapots. A bubble of the molten glass is put inside a two-piece mold. Air is then forced into the mold, which presses the glass against its sides. The glass cools inside the mold and conforms to the shape.

Glass pressing is used to create thicker pieces of glass. The molten glass is put into a mold and a plunger is lowered which forces the glass to spread and fill the mold. Drawing is used to create tubing or rods. In this process, molten glass is drawn down over a hollow cone called a mandrel. Air is blown through it to keep the tube from collapsing until the glass becomes rigid.

Borosilicate glassware can add a touch of flair to your table. Now that I have tried this glassware, I have transformed my kitchen table. It has been a vast improvement over the Tupperware!