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 FB-Foam Fire Block Sealant,12 oz.,Orange,Aerosol

3M FB-Foam Fire Block Sealant,12 oz.,Orange,Aerosol

4.3/5

Product ID: 691747276

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Details

Colour
Orange
Brand
3M
Item Weight
14.4 Ounces
Liquid Volume
12 Fluid
Item Form
Foam

💧Water resistant for lasting protection

🔥Meets IBC & IRC fire codes

🧱Expands to seal gaps on multiple surfaces

Description

🔥 Seal the deal on safety and style!

DURABLE FOAM SEAL - Long-lasting with minimal shrinkage to maintain airtight fire barriers
MULTI SURFACE MASTERY - Adheres seamlessly to wood, glass, plastic, and metal for versatile use
WATER RESISTANT FORMULA - Keeps fire blocks effective even in damp environments
EASY AEROSOL APPLICATION - 12 oz. convenient spray can for quick, professional-grade sealing
CODE READY FIRE PROTECTION - Complies with International Building & Life Codes for peace of mind

3M FB-Foam Fire Block Sealant is a 12 oz. orange aerosol foam designed to meet stringent International Building and Life Code fire protection standards. It expands to fill gaps on wood, glass, plastic, and metal surfaces, offering durable, water-resistant fire blocking with minimal shrinkage. Made in the USA, this professional-grade sealant ensures long-lasting, reliable fire safety for your projects.

Specifications

Colour	Orange
Brand	3M
Item Weight	14.4 Ounces
Liquid Volume	12 Fluid Ounces
Item Form	Foam
Surface Recommendation	Wood, Glass, Plastic, Metal
Water Resistance Level	Water Resistant
Manufacturer	3M
UPC	051115549076
Global Trade Identification Number	00051115549076
Material	Foam
Country of Origin	USA
Model number	98040056149
Item Weight	408 g
Product Dimensions	24.38 x 22.61 x 30.99 cm; 408.23 g
Item model number	98040056149
Item Height	12.2 Inches
Item Width	8.9 Inches
Are batteries included?	No

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3M FB-Foam Fire Block Sealant,12 oz.,Orange,Aerosol

Details

Description

Specifications

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