4. Corrosion Resistance
Similar to the properties of glass-lined steel, glass equipment provides unsurpassed corrosion resistance to water, neutral and acidic solutions, concentrated acids and acid mixtures, and to chlorine, bromine, iodine and organic substances. Its resistance to chemical attack is superior to that of most metals and other materials, even during prolonged periods of exposure and at temperatures above 100 °C. There are only a few chemicals which can cause noticeable corrosion of the glass surface - hydrofluoric acid, concentrated phosphoric acid and strong caustic solutions at elevated temperatures. However, at ambient temperatures caustic solutions up to 30% concentration can be handled by borosilicate glass without difficulty.