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B3 Gap Filling Foam – PU Foam
The B3 Gap Filling Foam is a product of the ARBOSEAL Pro® category and is used as a polyurethane foam for sealing, filling and insulating gaps and joints. It is suitable for general construction and façade applications requiring controlled expansion. Available in Gun Grade and Hand Held.
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Unique properties of B3 Gap Filling Foam
B3 Gap Filling Foam provides a reliable solution for sealing and insulation with controlled expansion and good adhesion. It is available in both gun grade and hand held formats to suit different application needs.
Suitable for sealing, filling and insulating gaps, joints and cavities
Provides thermal and acoustic insulation performance
Offers low curing pressure to minimise deformation of building elements
Designed for controlled expansion and effective gap filling
Adheres well to a wide range of construction materials
Suitable for installation of window and door frames
Helps reduce the impact of thermal bridges
Available in precision gun grade and ready-to-use hand held formats
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Main Applications
ARBOSEAL Pro® B3 Gap Filling Foam is used for sealing, filling and insulating gaps and joints in façade and construction applications.
Window Installation
Used for installing window and door frames, providing sealing and insulation around openings in building structures.
Joint Sealing
Suitable for sealing joints in walls, floors and other construction elements to improve airtightness and insulation.
Penetration Sealing
Used to fill and seal penetrations, contributing to insulation and airtight performance in building elements.
Insulation Applications
Suitable for sealing insulation boards and improving thermal and acoustic performance of structures.
Frequently Asked Questions
The B3 Gap Filling Foam offers a versatile solution for sealing, filling and insulating in construction. With both gun grade and hand held options, it provides flexibility in application while ensuring good adhesion, controlled expansion and reliable performance across common building materials.
Key benefits include: suitability for sealing and gap filling; thermal and acoustic insulation contribution; low curing pressure; controlled expansion; adhesion to multiple substrates; availability in gun grade and hand held formats.
The ARBOSEAL Pro® range is a comprehensive portfolio of professional-grade sealants manufactured by Adshead Ratcliffe under the ARBO® brand. The range covers silicone, modified polymer, polyurethane, polysulphide, epoxy, acrylic, butyl, and oil-based sealant technologies, providing a complete solution for sealing, bonding, and jointing across all types of construction projects — from glazing and cladding to flooring, facades, and secure environments.
Product selection depends on the substrate type, joint movement, environmental exposure, and performance requirements. Neutral cure silicones (e.g. Arbosil LMS, Arbosil 1096 S) suit glazing and perimeter sealing. High-modulus options (e.g. Arbomeric MP20) handle structural joints. Polysulphides (e.g. Arbokol AG2, Arbokol 2150) provide chemical resistance for floors, roofs, and water-retaining structures. Epoxy sealants (e.g. Arbokol SECURE, Arbokol 1025 SP) deliver hard-wearing seals for secure environments and pool applications. Contact ARBO® Technical Services for specific guidance.
All joint faces must be clean, dry, and free from dust, oil, grease, loose material, and previous sealant residues. For porous substrates such as concrete and brickwork, the application of an ARBO® primer is recommended to maximise adhesion. Always consult the product-specific Technical Data Sheet (TDS) for primer and cleaner recommendations. Application should be carried out in accordance with BS 8000-16:1997 + A1:2010.
Technical Data Sheets (TDS), Safety Data Sheets (SDS), and Declarations of Performance (DoP) for all ARBOSEAL Pro® products are available for download on each individual product page at arbo.co.uk. The full ARBO® Product Catalogue is also available for download. For further technical support or specification advice, contact ARBO® Technical Services directly.
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Find your contacts
Regardless of whether you are an architect and planner, property developer, industry specialist, distributor, applicator or specifier – if you have any questions about our products, services or specific construction projects, please feel free to contact the CARLISLE® contact person in your area with your technical questions. Our experts will be happy to advise you.
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