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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3M 7100006734 FB-FOAM Fire Block Foam - 12 oz.

Product ID: 731981823

Details

Brand
3M
Global Trade Identification Number
Material
Polyurethane
Number of Packs
1
Recommended uses for product
Fire blocking

🔥Expands 200% volume

🏗️Bonds to multiple surfaces

🛡️Heat-resistant to 240°F

Description

🔥 Seal the gap, stop the spread—fireproof your space with confidence!

CODE APPROVED SAFETY - Meets ASTM E 84 and IBC/IRC fireblocking standards—your trusted compliance partner.
INSTANT FIRE DEFENSE - Ready-to-use formula means no mixing, no hassle—just spray and seal.
HEAT RESISTANT SHIELD - Withstands temperatures up to 240°F, protecting your home from fire hazards.
UNIVERSAL SURFACE GRIP - Adheres strongly to concrete, brick, metal, wood, plastic, and cable jacketing for versatile application.
MAXIMIZED SEAL EXPANSION - Expands up to 200% to fill gaps and block flames and smoke effectively.

3M FB-Foam Fire Block Foam is a professional-grade, ready-to-use polyurethane foam that expands 200% to seal openings around wires, pipes, and penetrations. Heat-resistant up to 240°F and tested to ASTM E 84 standards, it provides reliable fireblocking and draft stopping in residential and commercial construction. Its excellent adhesion to diverse materials ensures a durable, code-compliant barrier that enhances safety and energy efficiency.

Specifications

ASIN	B008KNP928
Best Sellers Rank	#134,226 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #510 in Fireplaces, Stoves & Accessories #693 in Hardware Sealers
Brand	3M
Brand Name	3M
Customer Reviews	4.4 out of 5 stars 472 Reviews
Global Trade Identification Number	00051115549076
Item Weight	14.4 Ounces
Manufacturer	3M
Manufacturer Part Number	00051115549076
Material	Polyurethane
Material Type	Polyurethane
Model Number	98040056149
Number of Packs	1
Recommended Uses For Product	Fire blocking, draft stopping, sealing openings around wires, cables, pipes and penetrations
Recommended uses for product	Fire blocking, draft stopping, sealing openings around wires, cables, pipes and penetrations
UPC	051115549076
Unit Count	1 Count

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