Do you need a special dispenser for this foam? Or will a standard caulking gun work?

You need a special dispenser. A standard caulking gun won't work.

Can this be used in a standard caulking gun?

No, it needs a special dispensing gun

Is this heat resistance .want to put in my corvette rocker panels .to fill in the gaps

Yes it has a fire rating which you can find on the tube or on the SDS but I think it is 2 hours.

What is the flame spread rating and smoke development rating?

Flame spread 2 hours. Class 1 smoke spread. I can tell you from being in the fire protection business. That this is acceptable anywhere in the United States. Per fire marshal and life safety inspectors. Basically anything that meets California fire protection laws meets all US needs. FIP 1-Step shall be a two-component, ready-to-use, gun-grade, firestopping foam. FIP 1-Step shall be tested to the criteria of ASTM E 814/UL 1479 Standard Test Method for Fire Tests of Penetration Firestop Systems, ASTM E 84/UL 723 Standard Test Method for Surface Burning Characteristics of Building Materials, ASTM E 90 Standard Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements, and ASTM E 413 Classification for Rating Sound Insulation. FIP 1-Step shall meet the requirements of the IBC, IRC, IFC, IPC, IMC, NFPA 5000, NEC (NFPA 70), NFPA 101 and NBCC.

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Description

🔥 Seal smart, soundproof sharp — the pro’s fire barrier foam!

RE ENTER REPAIR - Pliable foam allows easy access and fixes post-installation 🔧
MAXIMIZED COVERAGE - Expands up to 5 times for efficient sealing ↗️
PAINT READY FINISH - Primer compatible for seamless, professional aesthetics 🎨
SUPERIOR SOUNDPROOFING - STC 57 rating blocks noise in professional spaces 📢
ULTIMATE FIRE PROTECTION - Certified 2-hour firestop barrier for peace of mind 🔥

3M Fire Barrier Rated Foam FIP 1-Step is a two-part urethane intumescent foam designed for industrial firestopping and soundproofing. Tested to withstand fire for up to 2 hours (ASTM E814) and rated STC 57 for sound control, it expands up to 5 times its volume to fill gaps efficiently. The foam remains pliable for re-entry and repairs, adheres without backing, and is paintable with primer, making it a versatile solution for professional building applications.