The majority of recyclable glass in the United States is clear glass, which is made from a simple combination of sand, soda ash and limestone. But just because it's clear doesn't mean it is accepted in your curbside recycling bin. Generally, clear glass that is used to package food products is safe to recycle. Clear glass you should keep out of the recycling bin includes heat-resistant glass like Pyrex, mirrors, window glass, leaded crystal, light bulbs and glass used for television screens and computers. The general rule of thumb when recycling glass? When in doubt, toss it out.