Pyrex is safe to use in the oven. Pyrex is a heat-tempered glass designed to withstand changes in temperature. The plastic lids of Pyrex containers and casserole dishes are not oven safe.
It is also dishwasher safe, microwave safe and suitable for freezing. A Pyrex dish can be placed directly into the oven or microwave from the refrigerator but should not be placed on a direct heat source, such as a gas or electric stovetop.
Originally, Pyrex glass was designed to be used in railroad lanterns. The use of Pyrex as ovenware was accidental and borne out of one woman's immediate need for a casserole dish. She used a portion of broken battery jar to replace her dish, which resulted in the beginning of a new type of heat-resistant cookware that is still in use today. Today, Pyrex sells many different kinds of ovenware and kitchen products, including casserole dishe
Pyrex is easy to clean and care for, and its nonporous construction resists stains and odors. Pyrex cookware and bakeware are available in a range of sizes and styles, including casserole dishes with fitted lids for storage. The glass is very durable and resistant to chips and cracks, but it can shatter if dropped onto a hard surface.
When purchasing Pyrex glassware, buyers should examine the clarity, shape and uniformity of the glass to ensure the piece is of the best quality. Holding the piece against a solid-colored surface checks for waves, color impurities and other inconsistencies that could indicate weaknesses in the glass.s, food storage containers and measuring cups.