On 3/16/2015 debc said: LOL, well I guess I like living on the edge here. The way I see it a chip is no different than when when the big make glasses out of beer/wine bottles. Once you sand that raw edge down you can use them. Most of my chips I've ever sanded are barely visible. Now a crack would be a totally different thing, I'd toss that.
*ETA* I actually use sandpaper and you can find fine enough that it's very smooth.
I would not use a modern-day Pyrex dish that had ANY damage whatsoever, including a chip.
Here's a sidebar from the lengthy investigation that CR conducted in 2012:
To minimize the chances of glass bakeware shattering, read and save the safety instructions on the product's packaging. Here are some safety rules to follow:
- Always place hot glassware on a dry, cloth potholder or towel.
- Never put glassware directly on a burner or under a broiler.
- Always allow the oven to fully preheat before placing the glassware in the oven.
- Always cover the bottom of the dish with liquid before cooking meat or vegetables.
- Don't add liquid to hot glassware.
- If you're using the dish in a microwave, do not use browning elements, and avoid overheating oil or butter.
- Do not take dishes directly from the freezer to the oven or vice versa.
- Never place hot glassware on top of a stove, on a metal trivet, on a damp towel, in the sink, on a cold or wet surface, or directly on a countertop.
- Inspect your dishes for chips, cracks, and scratches. Discard dishes with such damage.
- To avoid risks associated with glass dishes, consider using metal bakeware for conventional and convection ovens.
~Who in the world am I? Ah, that's the great puzzle~ Lewis Carroll, Alice in Wonderland