If you’d like to try an alternative to classic porcelain, then Tonda is the perfect complement to your home.


    Follow us


    Eigenart B2B

      /  Materialkunde   /  What actually is … BOROSILICAT GLASS

    What actually is … BOROSILICAT GLASS

    Some of you may have noticed that we always point out that the body of our EVE glass carafe and FLOWTEA drinking bottle is made of borosilicate glass. But what actually is borosilicate glass and what makes this glass so special? Here are a few facts in brief, because yes, it really does exist, the difference between glass and glass:


    Maybe you have already experienced it yourself: you pour boiling water into a glass, there is a loud bang and the glass bursts and breaks into 1000 pieces. But why is that? If you pour hot tea into a water glass, for example, the inside of the glass heats up very quickly so that the glass expands very quickly on this side. On the outside, on the other hand, this process happens less quickly. The resulting considerable stresses between the inside and outside can cause conventional glass to burst. The solution to this problem: borosilicate glass!

    Due to its chemical composition and its high melting point (820°), borosilicate glass can withstand boiling water and is therefore quite heat-resistant. It neither becomes cloudy nor bursts, can also withstand temperature fluctuations and scores with a temperature resistance of up to 515°. This is why this glass is so popular in medical technology, among other applications.


    One thing first: glass is glass and therefore fragile. Although glass is a material with a high compressive strength, it cannot deform permanently, which means that permanent crack propagation cannot be prevented in the event of strong external impact. However, due to its special manufacturing process and its chemical resistance, borosilicate glass has an extremely high stability. Thus, this glass is exposed to an extremely high temperature in the manufacturing process and immediately cooled down. This sudden cooling leads to a densification of the glass surface and it reacts comparatively stable to mechanical loads – and this with a relatively low own weight!


    Plastic and plastic – for many consumers a “no go” when it comes to storing liquids. And not only because these materials often contain questionable ingredients that are suspected of releasing these substances into the liquids/food they are supposed to protect. Drinks stored in plastic containers also often have a different “stale” aftertaste. Carafes made of borosilicate glass, on the other hand, are free of chemicals and therefore guarantee absolutely harmless drinking pleasure. In addition, borosilicate glass is basically odourless and tasteless – a “must” for anyone who wants to enjoy their drink to the full!


    The good news first: borosilicate glass is 100% recyclable and can be reused an infinite number of times without any loss of quality. The better thing afterwards: the glass of borosilicate carafes is 3-5 times harder than that of carafes made of conventional glass. Thus, glass vessels made of borosilicate potentially have a much longer lifespan and are therefore your long-lasting companions that do not need to be replaced again and again. This saves resources and energy – which is absolutely necessary in terms of sustainability in every area.

    I wish you a lot of fun,
    Your Andrea Döpper

    Customer Service (DACH region)