Introducing Partel's expanding foam, FOAMSEAL Liquid B1 is a moisture‑curing, single‑component polyurethane foam sealant engineered for fire and air sealing, ideal for professional use with a PU foam gun. It delivers exceptional thermal and acoustic insulation while maintaining a B1 fire rating (DIN 4102‑1 / EN 13501‑1: B‑s1,d0) for enhanced passive fire protection.
 
This eco‑friendly formulation contains no CFCs, HCFCs, or HFCs and boasts EMICODE EC1PLUS certification for very low emissions—making it safe for indoor environments.
 
Save over 10% off RRP and BUY BULK getting 12 cans for just £13.00+VAT each.
 
TYPICAL PROPERTIES
Property
Specification
Contents
750 ml can
Yield
40 litres
Colour
Yellow
Reaction to fire
B1 / B‑s1,d0
Thermal conductivity
0.035 W/mK
Skin formation time
8–10 minutes (20 °C / 65 % RH)
Trim time
30 minutes
Full resilience
3 hours
Temp. resistance
–40 °C to +80 °C (up to +120 °C)
VOC/Emission rating
EMICODE EC1PLUS
Storage life
12 months (dry, 20 °C)
 
APPLICATIONS
Perfect for fire‑rated sealing, insulation, and air‑tightness in internal and external installations including:
External & Internal use
Windows, roof lights, doors, attic conversions
Partition walls, shutter boxes, HVAC and ventilation penetrations
Thermal insulation joints, piping, metal and wooden structures
Openings and cavities in masonry, plaster, concrete, aerated concrete, brick, plasterboard, ceramics, stone, various plastics, styrofoam, and more.
 
INSTALLATION TIPS
Ensure substrate is clean, stable and free of dust/grease. Pre‑prime gypsum when needed.
Lightly moisten dry surfaces to optimize expansion and adhesion.
Shake can ≥20 times before use; attach foam gun, dispense sparingly, then spray lightly with water to accelerate curing.
Best used between +5–+30 °C for the can, +15–+35 °C ambient; avoid sub-zero surfaces.
Trim hardened foam mechanically; clean fresh residue with Partel FOAMSEAL Cleaner.
 
WHY PARTEL FOAMSEAL B1?
External & Internal use
Meets fire protection needs in passive‑house and commercial applications
High‑yield, efficient, and easy to use for professional installers
Certified and low‑emission—aligns with modern sustainability and indoor air‑quality standards
Durable cold and wet performance, suitable for demanding environments with long‑term stability
 
Elevate your fire‑sealing and insulation solutions with FoamSeal Liquid B1, a certified, high‑yield, low‑emission expanding foam that delivers fire safety, thermal performance, and ease of use in one professional system.
 
Photo images are generic of product and may not represent your item size.