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Ensure reliable, long-lasting seals in static, internal cool room and refrigeration applications. FULASEALPRO 840NS provides a permanently plastic, non-skinning butyl sealant that remains effective and flexible even down to -40°C. This prevents moisture ingress and thermal leakage, critical for maintaining controlled cold environments.
FULASEALPRO 840NS is a purpose-built, butyl-based sealant designed specifically for critical low-temperature sealing. It is non-skinning, non-sagging, and permanently plastic. This unique formulation delivers a durable, moisture-resistant barrier that maintains its flexibility and integrity in freezing conditions. Unlike sealants that cure and harden, FULASEALPRO 840NS retains its non-curing nature, eliminating the risk of cracking or adhesion loss under extreme cold, a common failure point in refrigeration and cool room construction.
This product's primary advantage lies in its wide service temperature range: from a frigid -40°C up to +50°C. This ensures the sealant performs consistently and remains permanently plastic across the full spectrum of cool room and refrigeration operation. Its non-skinning property offers an extended open time, which is crucial for precise alignment and assembly of large insulation panels. With an approximate specific gravity of 1.4, the sealant is non-sagging, allowing for clean, controlled application on vertical or overhead joints without slumping or mess.
FULASEALPRO 840NS applies easily from a standard gunnable cartridge. Optimal adhesion begins with thorough surface preparation: all substrates must be clean, dry, and free of contaminants. The recommended method for lightly contaminated surfaces is a two-rag wipe with Isopropyl Alcohol (IPA). For metals, light abrasion prior to cleaning can further enhance bond strength. The non-sagging formula allows for controlled bead placement. Apply to one surface, then combine the components, leveraging the non-skinning property for precise positioning. Cleanup is simple, using organic solvents like mineral spirits. Note this product is not paintable, which is important for final finish considerations.
Use FulasealPRO 840NS for small, static joints where no movement or dynamic stress is expected. It is a permanently plastic, non-elastomeric sealant designed for applications like cool room construction and insulation panels, not for joints that will move.
No, FulasealPRO 840NS is not suitable for applications exposed to weathering and dirt pick-up. For exposed areas, consider a product like H.B. Fuller 770 Sanitary Silicone, which is designed for those conditions.
FulasealPRO 840NS is formulated for a service temperature range of -40°C to +50°C. This makes it suitable for demanding low-temperature environments such as cool rooms and refrigeration units.
No, this sealant is not paintable. Ensure you account for this in your project planning, especially for visible joints.
| Application | Key benefit | Primary trades |
|---|---|---|
| Cool room construction and sealing | Forms a durable, non-skinning, permanently plastic seal that resists moisture and performs down to -40°C. | Cool room installers, refrigeration technicians |
| Refrigeration unit construction | Ensures excellent low-temperature performance and moisture resistance without separating or bleeding on non-porous surfaces. | Refrigeration manufacturers, appliance assemblers |
| Insulation panel construction | Provides a non-corrosive, non-sagging seal suitable for static joints in sandwich panels, Alucobond, and Zincalume. | Panel fabricators, builders |
| Concealed lap joint applications | Delivers a permanently plastic, non-skinning seal that maintains integrity over time, avoiding common failure modes of exposed sealants. | General builders, metal fabricators |
Clean all surfaces thoroughly following the two-rag IPA method. Ensure no dust, oil, or old sealant remains. Allow cleaned surfaces to fully dry before applying the mastic.
Cut the cartridge seal, attach the nozzle, and cut to the desired bead size (typically 5 mm). Load the cartridge into a quality caulking gun for smooth application.
Hold the gun at a 45° angle and push forward, forcing the sealant into the joint. Apply a continuous bead to one surface, then assemble the joint while the sealant is fresh. Adjust panels as required – the non-skinning property allows time to reposition.
Remove excess mastic immediately with a cloth dampened in mineral spirits. Dispose of waste safely according to local regulations.
For prolonged or repeated skin contact, use nitrile rubber gloves. Wear safety glasses to protect eyes. Respiratory protective equipment is not normally required unless ventilation is insufficient.
Ensure adequate ventilation during application. If ventilation is insufficient, wear suitable respiratory equipment.
Store between +5°C and +25°C in unopened packaging, in a dry area away from direct sunlight. Keep the container closed when not in use. Do not freeze. Dispose of solidified material in an approved landfill; consult local authorities for specific requirements.
Proper surface preparation is critical for FulasealPRO 840NS to achieve reliable adhesion and long-term performance.
Surface prep: All surfaces must be clean, dry, sound, and free of dust, oil, old sealant, or other contamination. For light contamination, use the 2-rag wipe method with Isopropyl Alcohol (IPA). For heavy contamination, use a generic wax and grease remover followed by a final IPA wipe. Light abrasion can further improve adhesion.
Primer: Not required for these common metals when properly prepared.
Surface prep: Ensure surfaces are clean, dry, and free from contaminants. Follow the 2-rag wipe method with IPA for general cleaning. If residues are present, use a wax and grease remover, then finish with an IPA wipe.
Primer: Not required.
Surface prep: Surfaces must be clean and dry. Consult plastic manufacturers for suitable cleaning solvents to avoid damage. Adhesion to specific plastics should always be pre-tested.
Primer: Pre-testing required to determine suitability and adhesion performance on specific plastic types.
| Property | Value |
|---|---|
| Colour | Off-White |
| Specific Gravity | ca. 1.4 |
| Application Temperature | +5°C to +35°C |
| Service Temperature | -40°C to +50°C |
| Skin Time | Non-skinning |
| Coverage | Approx. 15 lineal metres (5mm bead per cartridge) |
Here are some common examples on where H.B Fuller FulasealPro 840NS Sealant used by our customers.
HVAC
Constructing internal components or hidden joints of static commercial refrigeration units.
Provides a non-sagging, moisture-resistant bond for internal, static components, preventing air and moisture ingress without hardening.
HVAC
Sealing internal lap joints between pre-fabricated cool room and freezer panels.
Its non-skinning, permanently plastic nature and -40°C service temperature ensure a durable, moisture-resistant seal in static, sub-zero environments.
Sheet Metal
Sealing concealed lap joints within non-moving insulation panels during their fabrication.
The non-skinning property allows precise alignment during assembly, creating a permanently plastic, moisture-resistant barrier for hidden joints.
HVAC
For assembling refrigeration unit components or sandwich panels where joints are hidden and require a permanent, static, moisture-proof seal.
As a non-skinning butyl sealant, it prevents hardening and cracking, maintaining a flexible, moisture-proof barrier essential for concealed, static joints.
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Plan your sealant volume and units in seconds.
Formula: Volume (ml) = Length (m) x Width (mm) x Depth (mm) x 0.001
Provides estimates for planning purposes. For critical applications, consult a qualified professional.
