Is it safe to microwave plastic?

Short answer

Why people ask this

Plastic containers are convenient, but people worry about chemicals transferring into food when heated.

When it might be safe

• The container is labeled microwave-safe by the manufacturer
• You microwave in short intervals and stir food to avoid hot spots
• You avoid plastic wrap touching food (use a vented cover instead)

When it is not safe

• The container is old, scratched, cloudy, or visibly warps when heated
• The plastic is not labeled microwave-safe
• You’re heating very fatty foods (they can get hotter and stress plastics)

Possible risks

• Chemicals leaching into food (risk varies by plastic type and heat)
• Plastic warping or melting, contaminating food
• Uneven heating that can leave cold spots in food (food safety issue)

Safer alternatives

• Glass or ceramic microwave-safe containers
• A microwave-safe plate/bowl with a vented cover
• Reheating on the stove for more control

Bottom line

If the plastic isn’t clearly labeled microwave-safe—or it’s worn or warps—don’t microwave it. Use glass or ceramic for the safest default.

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