Borosilicate glass is a type of glass with silica and boron trioxide as the main glass-forming constituents. The glass has numerous advantages over regular soda–lime glass, including being harder to break when dropped; more resistant to cracking from significant changes in temperature; having a higher clarity (transparency), which is maintained over a longer period of time; and being non-toxic, BPA-free, and resistant to chemical leaching. Borosilicate is generally slightly more expensive than soda-lime glass.