Pyrex Classic glass kitchen lab: At Pyrex, we love to cook and bake in every kitchen around the world. All Pyrex glass products are made in France of high quality borosilicate glass. Pyrex products have a 10 year guarantee. All glass Pyrex products have thermal shock resistance up to 220 degrees celsius. These products can withstand temperatures up to 300 degrees celsius and down to -40 degrees celsius. Oven , microwave, dishwasher and freezer friendly. Plastics lids are not heat resistant and may not be used in the oven or microwave.