How to choose a proper heat resistant glass tumbler

How to choose a proper heat resistant glass tumbler

What is new in this season from Garbo Glassware? Recently we launched a brand new series of heat resistant glassware products, which mainly consists of regular highball glass cups, egg shape glass tumblers and irregular beer glasses in multi sizes and shape designs. The basic design of them is not different from the common ones in soda lime glass, or we can simply say that they all come from our existing glass molds but we add boron borosilicate into the raw material in order to deliver them as a strong heat resistant version that can be used on microwave, oven or for any hot and cold drinks.

The very first step for how to choose a heat resistant glass tumbler is to know the difference between it and a non heat resistant glass. A normal soda lime glass is not designed to be heat resistant but the soda lime glass product mixed with boron or borosilicate is technically designed to be used on microwave, oven and thermal shock duration. You don’t likely know by the glass appearance if you are not engaged in the glassware business, do you? There is a little trick for a quick check when the commodity is not labeled as a heat resistant glass cup, you can focus on its top rim and you will find the colour is a little bit yellower or greener amid the glass transparency due to the boron chemical feature. But of course it is not the only criteria since normal glass can be like that when it is a low quality product for low budget oriented market. The other way is to compare the weight or basically you can even feel it when you take a borosilicate glass cup in hand, from which you may deem the weight is too light to be real and the whole glass is too fragile to withstand a mild hit. The trick is on the density of boron even it has been mixed into soda lime.

If we go straight up on a testing, it will explain a lot and easily identify for us since our clients may have to see the testing result before placing his order. We freeze both of them for 30 minutes to an hour before we pour boiled hot water into them, from which we can verify a borosilicate glass cup withstands a sudden temperature change from -20C℃-130℃. We can obviously tell from this testing video, the whisky glass in normal standard exploded within 2 seconds after being watered whilst the others still remained standing perfectly. But please do understand the point that a sudden change of temperature does not mean simply the temperature that a glass can withstand, a normal glass cup is also capable with serving a cup of hot tea but we should avoid the rapid change on temperature. 

The advantages of this new series would be firstly that it perfectly works with high temperate decal, low lead & low cadmium decal, acid and alkali resistant decal, decal with real gold and decal with special colour like black, sapphire and rose red due to its strong heat resistance. The other point is small MOQ for them since all of them are stocked as regular sale items, by the way it would be perfect for those who live in the cold area and would like a cup of hot drink in winter.