Nelson Firestop PUTTY, 1"x 3”x 12”–FSP™, NELAA447

MSRP: $39.00
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Nelson Fire Stop Products
Manufacturer: Nelson Fire Stop Products
Manufacturer Part No: AA447
PHTS Number: NELAA447



Nelson FSP™requires no special skills or tools to install. To ensure adequate adhesion, all surfaces should be clean and free of dust, grease, oil, loose materials, rust or other substances. Apply the required depth of FSP™over various backing materials as required. Ensure that the FSP™makes complete contact with the inside surface of the opening and also the surface of each penetrating item. FSP™is ideal for cable penetrations where cable additions are common due to the characteristic of FSP™remaining pliable. It can also be used for metallic, non-metallic and insulated pipes, cable tray and ductwork applications in a variety of fire rated floor or wall constructions. Actual installation may vary according to the type of firestop application. Refer to available firestop systems. 



AA445 –1”x 3”x 12”(36.0 cu. in.) –10/Ctn.


Underwriters Laboratories Inc. "Fill, Void or CavityMaterial (XHHW)", FM, ABS and USCG.

California State Fire Marshal.

City of New York, New York, Department of Buildings

MEA 135-00-M

MEA 196-84-M Vol. 3


Up to a 3-Hour Rating

Reusable for Convenient Retrofit


Smoke and Gas Tight

Weather Resistant

Excellent Shelf Life

Acoustically Tested –Reduces noise transmission

Halogen Free

Physical Properties


Density…………….0.049 lbs/cu. in.

Consistency...…….7.00mm (Penetrometer)

Application Temp…0F (4C) to 110F (43C)

Dielectric strength…356v/mil.

STC Rating…………………5 

Test Compliance

ASTM E84 Flame spread…………

Smoke developed……0 

ASTM E90 Standard Test Method for

Laboratory Measurement of Airborne Sound

Transmission Loss of Building Partitions and

ElementsASTM E814 and UL1479 - Test method for through stop fire penetrations. 

ANSI/UL 263, "Fire Tests of Building Construction and Materials."

NFPA 70 "Wall Opening Protective Materials"

Testing Data

For specific test criteria, refer to the UL Fire Resistance Directory. 

Storage & Handling

Nelson FSP™should be stored indoors. Long term storage temperature: 140ºF (60ºC) maximum. There is no indication of shelf-life limitations. Partially used bars should be re-wrapped in their original packaging before being stored. 

Related References

Underwriters Laboratories Inc. "Fire Resistance

Directory". Application details are available in AutoCAD

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