PYREX 209 9 IN-23cm for Oven / Microwave Vintage

PYREX 209 9 IN-23cm for Oven / Microwave excellent condition no cracks or chips Borosilicate glass Pyrex with all capital letters is usually made of borosilicate glass, which is safer and can withstand high temperatures without breaking. Borosilicate glass is also resistant to chemical exposure and thermal shock, making it useful in laboratories modern pyrex is soda lime glass and not as heat resistant made in USA by corning E1-75