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.

Why this product exists

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.

The numbers that matter

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.

What it's like to use

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.

Where this product excels

• Cool Room Construction: Forms durable, moisture-resistant seals for internal panel lap joints, critical for preventing energy loss and condensation in sub-zero environments.
• Refrigeration Unit Assembly: Provides permanently plastic, low-temperature seals for components within commercial and industrial refrigeration units, ensuring long-term thermal integrity.
• Insulation Panel Manufacturing: Ideal for bonding and sealing modular insulation panels, offering excellent adhesion to substrates like steel, aluminium, and polystyrene, even under temperature extremes.
• Concealed Lap Joint Sealing: Creates airtight and moisture-tight seals in hidden joints, protecting against internal corrosion and improving overall energy efficiency without exposure to external weathering.

Choose this when

• When sealing static joints in internal cool rooms or refrigeration units where a permanently plastic, moisture-resistant seal is required.
• For constructing or repairing insulation panels where excellent adhesion to substrates like steel, aluminium, and polystyrene in cold conditions is critical.
• In applications benefiting from a non-skinning sealant, allowing extended open time for precise panel alignment and adjustment.
• For internal applications with consistent low temperatures, demanding reliable performance down to -40°C without hardening or cracking.

Don't use this when

• Not for: Joints with expected movement or dynamic stress. This is a non-elastomeric mastic, not suitable as a movement sealant.
• Not for: External applications exposed to weathering or dirt pick-up. Its non-skinning nature makes it unsuitable for outdoor exposure. Consider H.B. Fuller 770 Sanitary Silicone for such areas.
• Not for: Applications subject to vibration, such as dynamic truck bodies or caravans, as constant movement can compromise the seal.
• Not for: Applications requiring painting. This product is not paintable and will affect the aesthetic if paint is applied.