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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 more resistant to thermal shock than any other common glass.
Beakers are commonly made of glass (today usually borosilicate glass [3]), but can also be in metal (such as stainless steel or aluminum) or certain plastics (notably polythene, polypropylene, PTFE). A common use for polypropylene beakers is gamma spectral analysis of liquid and solid samples. Beakers of different sizes
Actually glass doesn't have any such thing as a melting point. Also borosilicate glass doesn't even have a higher softening temperature than conventional soda-lime glass. The main advantage is the low thermal expansion coefficient. It makes borosilicate glass less sensitive to thermal gradients and thermal shock. Regards, Herbert
Beaker (laboratory equipment), a glass container used for holding liquids in a laboratory setting; Beaker (archaeology), a prehistoric drinking vessel; Beaker culture, the archaeological culture often called the Beaker people; Sippy cup, referred to as a beaker in UK English
The appearance of the Hedwig beakers resembles rock crystal, or quartz, and they are made of soda ash glass, which is composed of plant ash and quartz sand. [9] Although no two look exactly alike, all have a similar conical shape, thick walls, and wheel-cut ornament. [10]
Crude versions of conically tapered ground glass joints have been made for quite a while, [1] particularly for stoppers for glass bottles and retorts. [2] Crude glass joints could still be made to seal well by grinding the two parts of a joint against each other using an abrasive grit, but this led to variations between joints and they would not seal well if mated to a different joint.
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