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 Fire Block Foam FB-Foam, Orange Color, Ready-To-Use, In-Place, 12 fl oz Can

Product ID: 12806392

Details

Brand
3M
Global Trade Identification Number
Item Thickness
Inches
Material
Polyurethane
Recommended Uses For Product
Fire Draft

🔥ASTM E84 Type V Fireblock tested

↗️Expands up to 200% volume

♨️Heat resistant to 240°F (115°C)

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₨636

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Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

UNIVERSAL ADHESION - Bonds securely to concrete, wood, metal, plastic, and cables for versatile application.
INSTANT USE NO PREP - Ready-to-use formula saves time—no mixing or waiting required.
CERTIFIED FIRE SAFETY - Meets ASTM E84 (modified) Type V standards for reliable fireblocking performance.
HEAT RESISTANT DURABILITY - Withstands temperatures up to 240°F, ensuring long-lasting protection.
MAXIMIZED SEAL INSULATION - Expands 200% to fill gaps, blocking air, smoke, and fire effectively.

3M Fire Block Foam FB-Foam is a professional-grade, ready-to-use polyurethane foam designed to seal and fireblock residential and commercial construction voids. Tested to ASTM E84 Type V standards, it expands up to 200% to effectively block air, smoke, and fire, while resisting heat up to 240°F. Its quick tack-free time, minimal shrinkage, and strong adhesion make it the go-to solution for durable, code-compliant fire and draft prevention.

Specifications

ASIN	B008KNP928
Best Sellers Rank	#10,988 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #33 in Urethane Adhesives #96 in Industrial Sealants
Brand Name	3M
Coverage	Up to 200% of the dispensed volume
Customer Reviews	4.4 4.4 out of 5 stars (473)
Global Trade Identification Number	00051115549076
Included Components	FIRE BLOCK FOAM
Item Thickness	item_thickness.string_value Inches
Item Type Name	3M FIRE BLOCK FOAM FB-FOAM, ORANGE, 12 FL OZ CAN, 12/CASE
Item Weight	14.4 Ounces
Manufacturer	3M
Manufacturer Part Number	00051115549076
Manufacturer Warranty Description	Warranty and Limited Remedy: 3M warrants that each 3M Fire Protection Product will be free from defects in material and manufacture for 90 days from the date of purchase from 3Ms authorized distributor.
Material Type	Polyurethane
Model Number	98040056149
Recommended Uses For Product	Fire Resistance, Draft Prevention
UPC	051115549076
Unit Count	1.0 Count

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