The primary material used for glass test tubes is silicate glass, which is produced by melting raw materials-such as silica sand (whose main component is silicon dioxide), soda ash (sodium carbonate), and limestone (calcium carbonate)-at high temperatures. These raw materials are mixed in specific proportions and, after being melted in a high-temperature furnace, form a transparent or translucent solid known as silicate glass.
Glass test tubes are primarily manufactured from silicate glass. Silicate glass is an inorganic, non-metallic material produced through the high-temperature melting of raw materials such as silica sand, soda ash, and limestone. Silica sand serves as the principal raw material for glass manufacturing, with silicon dioxide being its primary constituent. Soda ash and limestone function as fluxing agents and stabilizers, helping to lower the melting point of the glass and enhance its chemical stability.