Silica sand is not the only component of glass. There are three:
The average melting point of these components is 1,400 - 1,600 °C (2552-2900 °F).
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Jars are made from glass. Glass is made from sand. When sand is heated over 1000 degrees it becomes a liquid. It is then moulded into a shape while it is hot.
It's due to the moisture in the clay evaporating.
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Rustolium and Krylon both make an outdoor paint but it would be best if you sand then prime the bench first and let it dry in an environment that is dry and hot .
Coffee mugs are usually made of ceramic earthenware materials instead of glass, because materials such as porcelain retain heat better than glass. If glass gets too hot, it will shatter.