Pyrex Glass Food Storage Containers vs. Polypropylene Food Container (#5 PP)

Materials

• Tempered soda-lime glass
• Plastic or silicone lids

Common claims

• Oven, microwave, and dishwasher safe
• BPA-free lids
• Non-porous glass

Concerns / watch-outs

• Modern Pyrex sold in the US uses tempered soda-lime glass, not borosilicate — more susceptible to thermal shock than older versions
• Plastic lids may contain BPA; look for confirmed BPA-free lids or use silicone alternatives

Notes

Pyrex glass is one of the most recommended non-toxic food storage options. The glass body is completely inert. Replace plastic lids if they become scratched or stained.

Cleaner alternatives

• borosilicate glass container
• mason jar

Materials

• Polypropylene (PP, recycling #5)

Common claims

• BPA-free
• Microwave safe
• Dishwasher safe

Concerns / watch-outs

• PP is generally considered one of the safer plastics, but some studies show leaching under microwave heat
• Scratched or old PP containers leach more; replace when visibly worn

Notes

Polypropylene (#5) is among the safer plastic types for cold food storage. Avoid microwaving fatty foods in any plastic container, including PP.

Cleaner alternatives

• borosilicate glass container
• stainless steel food container