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From humid commercial kitchens to sun-baked rooftops and below-waterline marine applications, some projects demand a sealant that performs across extremes. N-40 GP Silicone Sealant delivers that reliability, ensuring flexible, anti-fungal, and UV-stable seals no matter the exposure. It means one product handles multiple demanding jobs on your site.
We developed N-40 GP Silicone Sealant over 30 years ago specifically for the diverse and challenging conditions found across Australian construction. It's engineered as a truly general-purpose, neutral-curing, anti-fungal silicone workhorse, designed to form highly elastic and durable seals. N-40 focuses on broad application versatility, resisting mould, UV degradation, and temperature extremes in a single product.
Unlike specialised structural glazing silicones like N-70 Glazing Silicone, N-40 provides a reliable, sanitary, and non-corrosive sealing solution across a wide array of building materials, including galvanised steel and concrete.
Prepare surfaces thoroughly. All substrates must be sound, clean, dry, and free of contaminants. For impervious surfaces, use a two-wipe process with Acetone or 100% White Spirits, ensuring cloths are clean and changed frequently. Masking joint edges will provide a neater finish and simplify clean-up.
If priming is necessary, test adhesion first. Apply Adheseal 50A Surface Prep for non-porous substrates or Everflex Supaprime Sealant Primer for porous surfaces, allowing it to dry for several minutes. Design joints with a 2:1 width-to-depth ratio where possible, using Adheseal backer rod to control depth in deeper joints and prevent three-sided adhesion. Apply the sealant steadily, pushing it firmly into the joint. Tool off with a moistened spatula within approximately 15 minutes before skinning occurs. Remove masking tape while the sealant is still wet. Clean wet spills and tools with white spirit. Once cured, the sealant must be removed mechanically.
Yes, Adheseal N40 is suitable for commercial kitchens and laundries. It is anti-fungal, inhibits mould and biological growth, and is rated safe for food preparation areas, reducing maintenance and health risks.
No, N40 may not be suitable for all types of stone. Always complete a stain testing program before using this sealant on natural stone to prevent potential discolouration.
Adheseal N40 accommodates joint movement up to ±25% of the original joint width. This high flexibility maintains a waterproof seal in dynamic applications such as roofing, marine, and construction joints.
N40 is a neutral (oxime) curing silicone that requires atmospheric humidity to cure properly. It will not cure in totally confined spaces where humidity cannot reach the sealant. Ensure adequate ventilation during and after application.
| Application | Key benefit | Primary trades |
|---|---|---|
| Roofing and plumbing water sealing | Neutral cure prevents corrosion on Zincalume and galvanised steel, accommodating high thermal movement. | Roofers, Plumbers, Builders |
| Marine and vehicle fabrication | Withstands temperature extremes (-50°C to +150°C) and handles vibration and structural movement, suitable for below-waterline once cured. | Boat builders, Vehicle fabricators |
| Shower walls, commercial kitchens, steam rooms | Anti-fungal additives inhibit mould and mildew in hot, humid environments, ensuring hygiene and durability. | Tilers, Plumbers, Commercial fit-out specialists |
| General construction and joint sealing | High flexibility (±25% movement) maintains a waterproof seal across diverse building materials like glass, timber, and aluminium. | Builders, Glaziers, Shopfitters, HVAC technicians |
Ensure surfaces are structurally sound, dry, and free of oils, dust, or contaminants. Use a two-cloth wipe method with white spirit on impervious materials. For rough surfaces, remove loose material and clean thoroughly.
Wipe with white spirit, dry, and mask adjacent tiles to avoid smears.
Degrease aluminium and coated steel with solvent wipes. Do not sand powder-coated surfaces.
Design joints with a 2:1 width-to-depth ratio where possible. Use backing rod to limit depth and avoid three-point adhesion. Joints wider than 10mm must use backing rod or bond breaker tape.
Minimum joint: 5mm x 5mm. Foam rod used where depth exceeds 6mm.
Use closed-cell rod 25% larger than joint width. Prevents excessive sealant consumption and ensures optimal joint movement.
Cut nozzle at 45° to match joint width. Insert cartridge into caulking gun and apply with steady pressure, pushing the bead ahead of the nozzle to achieve full contact with both sides of the joint.
Use even pressure on trigger. Apply a continuous bead with no gaps. Avoid pulling the gun, which may create air pockets.
Set to 2–3 bar for controlled dispensing. Suitable for long runs or professional joinery use.
Let silicone cure undisturbed for 24–48 hours depending on joint depth. Clean uncured material with white spirit. Do not expose to moisture during initial curing phase.
Wipe immediately with lint-free cloth dampened with solvent. Tooling residue can be cleaned with white spirit.
Remove mechanically using a scraper or silicone removal tool. Avoid harsh abrasives.
Signal Word: Warning
Adheseal N40 Silicone Sealant is classified as hazardous according to Safe Work Australia criteria. May cause an allergic skin reaction and serious eye irritation.
Use personal protective equipment as required. Avoid contact with eyes, skin, and clothing. Ensure eyewash stations and safety showers are accessible near the workstation.
Natural ventilation is adequate under normal use conditions. Ensure a well-ventilated area for proper curing.
Store in a cool, dry, well-ventilated place, out of direct sunlight and away from foodstuffs. Keep containers tightly closed when not in use. Dispose of contents and container according to local, regional, and national regulations.
Proper surface preparation and priming are critical for reliable long-term adhesion with Adheseal N40. Incompatible substrates can lead to poor adhesion or discolouration.
Surface prep: All surfaces must be structurally sound, dry, and free of dust, oils, grease, and contaminants. Use the two-wipe process with Acetone or 100% White Spirits, changing cloths frequently.
Primer: Optional. An adhesion test is recommended. If priming is necessary, use Adheseal 50A.
Surface prep: Surfaces must be stable, dry, clean, and free of contaminants. Concrete must cure for at least 28 days before application to prevent mould growth and ensure adhesion.
Primer: Optional. An adhesion test is recommended. If priming is necessary, use Everflex Supaprime for porous substrates.
Surface prep: As per porous or impervious guidelines, ensuring cleanliness and dryness.
Primer: Optional. Conduct a stain testing program on a hidden area of the specific stone type before full application to avoid discolouration or adhesion issues.
| Property | Value |
|---|---|
| Type Of Product | Polysiloxanes |
| Curing System | Oxime |
| Density | 1.03 g/cm3 (translucent) |
| Shore A Hardness | 20 |
| Elongation At Break | 300% |
| Application Temperature | +5°C to +35°C |
| Temperature Resistance | -50°C to +150°C |
| Movement Capability | ±25% |
| Elastic Recovery | >90% |
| VOC Content | 43 g/L |
| Skin Time | 20 minutes |
| Cure Rate | 2mm per day (at 25°C & 50% humidity) |
Here are some common examples on where Adheseal N40 Silicone Sealant Aluminium Grey used by our customers.
