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Nelson Firestop LBS3™ Latex Sealant

Description of Nelson Firestop LBS3™ Latex Sealant

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Nelson Fire stop Sealant is a water-based paste that is used to seal openings and gaps in walls, roofs and floors left from intrusive pipes to prevent fire, water, smoke and gasses from passing. With its fast drying capabilities (tack-free in approx 15min.) and halogen-free make-up, this fire stopping sealant can applied in any direction without running.

Safe to handle and easy to install, Nelson's Fire Stop Latex Sealant comes in tubes for caulk guns, foil packs for bulk loaders, and buckets for use with trowels and other spreading tools.

Please click the "More Information" tab for additional data.

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Features and Benefits

  • Rated up to 3 hours of fire protection.
  • Quick drying formula.
  • Water based for easy clean-up and safe handling.

More Info

Chemical Name / Class Polyvinyl Acetate and Acrylic Latex Based Emulsion
Product Use Elastomeric Intumescent Firestop Sealant
Color Red
Odor Mild Latex Odor
Cure Time Approx 2 hour
Full Cure 3 to 4 weeks
Asbestos Filler None
Solvents None
Density 10.0 lbs / gallon
VOC Content 10.86 g/l
Application Temperature 40 to 90 F (4 to 32 C)
Activation Temperature Exp. begins @ 250
STC Rating 52

Test Compliance
Standards ASTM E84 and UL 723
Flame Spread 0
Smoke Developed 5
Test Methods ASTM E90; ASTM E814 & UL 1479; ASTM E1966 & UL 2079; ASTM C719
Storage between 40 to 90 F (4 to 32 C); protect from freezing
Shelf Life 1 year from date of shipment
Relative Vapor Density (air = 1) >1
Evaporation Rate (n-BuAc = 1) 1
Specific Gravity (water = 1) Not available
Viscosity Unknown
Solubility in Water Appreciable
Boiling Point >100 C (212 F)
Vapor Pressure, mm Hg @ 20 C Unknown
pH n/a
Bulk Density (lbs / Cubic Foot) n/a
% Volatiles (gr/L) (70 F / 21 C) 10.86 g/l 10
Stability Stable
Decomposition Products Carbon dioxide, Carbon monoxide, Low molecular weight hydrocarbons, Aldehydes
Hazardous Polymerization Will not occur
Conditions to Avoid Strong oxidizers, strong acids

Composition & Information on Ingredients
Ingredient CAS Number Percent (Max)
2-Porpenoic acid, polymer 052640-81-0 10-20
Dipentaerythritol 00126-58-9 1-5
Graphite 007782-42-5 1-5
Melamine 00108-78-1 1-5
Methenamine 000100-97-0 < 1
Phenol, isopropylated, phosphate (3:1) 068937-41-7 5-10
Phenol-formaldehyde polymer 009003-35-4 1-5
Polyvinyl Acetate Emulsion NJ801415075P 10-20
Pseudocumene 000095-63-6 < 1
Silicic acid, sodium salt 001344-09-8 5-10
Talc 014807-96-6 1-5
Triphenyl phosphate 000115-86-6 1-5
Zinc borate 001332-07-6 1-5


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