Will this hold up to tempetatures up to 320 degrees??

No it is only rated to 240 degrees Fahrenheit

can this be painted over?

This is not a product that should be exposed such that they finish paint coat would be necessary. It should be used in the rafters and in areas you’re trying to fire block to prevent the spread of flames in an emergency situation. I have no idea if you can paint this, because I don’t think you should ever need to.

Closed cell or open cell?

Should be on the label imo because of its density I would say closed I've seen open cell nowhere near as thick as this you would have to cut this stuff off open cell I can rip w my hands

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🔥 Seal the gap, stop the flame, own the safety game!

AIRFLOW CONTROL - Effectively reduces air intrusion, improving insulation and energy efficiency
RAPID EXPANSION SEAL - Expands up to 200% to fill gaps instantly and block drafts
CERTIFIED FIRE SAFETY - Meets ASTM E84 (modified) Class 1 for superior flame and smoke resistance
READY TO USE CONVENIENCE - No mixing required—just spray and seal for fast, professional results
HEAT RESISTANT DURABILITY - Withstands temperatures up to 250°F (115°C) for reliable fire protection

3M Fire Block Foam FB-Foam is a professional-grade, ready-to-use polyurethane foam designed to seal and fireproof openings in residential and commercial buildings. Tested to ASTM E84 standards, it expands up to 200% to block drafts and resist heat up to 250°F, ensuring enhanced fire safety and improved air circulation.

Manufacturer	3M
Part number	00051115549076
Item Weight	408 g
Product Dimensions	24.38 x 22.61 x 30.99 cm; 408.23 g
Is Discontinued By Manufacturer	No
Size	Pack of 1
Color	orange
Style	FB-Foam
Material	Steel
Number Of Pieces	1
Temperature Range	2.4E+2 華氏
Included Components	Fireblock foam
Batteries Included	No
Batteries Required?	No
Item Dimensions LxWxH	24.4 x 22.6 x 31 cm

3M Fire Block Foam FB-Foam, Orange, Ready-to-Use Foam-in-Place, 12.5-Ounce Can

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