Learn more› By Kathleen Squires After new testing, the identical glass Pyrex Freshlock and Snapware Total Solution Pyrex Glass sets are our top picks. We also love the Pyrex Ultimate containers ...

or pyrex (lowercase). Some fans claim these labels indicate what type of glass it is. They say that the former is borosilicate, a glass made of silica, boron trioxide, soda ash, and alumina ...