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Price Per Unit: $6.94
Price Per Box: $6.25
At a Glance: Key Applications
Use N40 GP Silicone Sealant for: Sealing joints in bathrooms, kitchens, roofing, glazing, HVAC, and marine settings where a flexible, anti-fungal and UV-stable solution is needed.
N40 GP Silicone Sealant: A Technical Overview
N40 is a high-performance, neutral-cure silicone sealant formulated for general purpose use across construction, marine, and industrial sectors. Its aluminium grey finish is UV stable and mould-resistant, offering excellent adhesion on materials like zincalume, porcelain, glass, timber, aluminium, and fibreglass. With ±30% joint movement capability and an operating temperature range of -50°C to 150°C, it's engineered for long-term durability in Australia’s toughest indoor and outdoor environments.
Core Features & Specifications
- Neutral oxime cure system – ideal for sensitive substrates including metals
- Excellent adhesion on ceramic, glass, aluminium, PVC, timber and metal
- Anti-fungal formulation – inhibits mould growth in humid conditions
- Weatherproof – UV stable and flexible under extreme climate exposure
- ±30% joint movement capability – allows for thermal expansion and contraction
- Low odour and low VOC (43g/L) – compliant with Green Star building criteria
The N40 GP Silicone Advantage
- Safe for use in food preparation and sanitary areas
- Cures without corrosion on zinc-coated and galvanised substrates
- Versatile for construction, plumbing, electrical and marine applications
- Compatible with porous and non-porous surfaces using appropriate primers
Storage & Shelf Life Considerations
Store in a cool, dry place between 10°C and 35°C. Shelf life is 12 months in original unopened packaging.
Certifications & Regulatory Compliance
VOC compliant with California Bureau of Air Quality Management Rule 1168. Meets criteria for Green Star environmental initiatives.
Frequently Asked Questions About N40 GP Silicone Sealant
Q: Can N40 be used in constantly wet areas like showers or commercial kitchens?
A: Yes. N40 is anti-fungal and designed for wet area sealing, including showers, commercial kitchens, and laundries. Its neutral cure prevents mould growth and maintains waterproof integrity in humid environments.
Q: Will N40 adhere to metal flashings and aluminium window frames?
A: Absolutely. N40 offers excellent adhesion to aluminium, galvanised steel, zincalume, and Colourbond. It cures without causing corrosion, making it suitable for external building and glazing use.
Q: Is N40 silicone suitable for use in areas exposed to direct sunlight?
A: Yes. N40 is UV stable and designed for permanent exposure. It won’t crack or degrade under Australian sun, making it ideal for external joints, roofing, and cladding junctions.
Q: Can I paint over cured N40 silicone?
A: No. N40 is not paintable. If paintability is a requirement, you may need to mask off areas or choose a paint-compatible alternative. The aluminium grey colour helps visually match common substrates.
Q: What is the joint size limitation for using N40?
A: Maximum recommended joint width is 30mm and depth 15mm. For joints over 10mm deep, a backing rod should be used to maintain proper depth and prevent three-sided adhesion.
Q: Does N40 require a primer for all surfaces?
A: Not always. N40 bonds well to most clean, dry surfaces. However, for porous substrates (e.g. concrete, timber), Primer 2001 is recommended. For non-porous surfaces (e.g. glass, aluminium), use Primer 50A where necessary.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Shower, kitchen and sanitary sealing | Anti-fungal and waterproof with flexible rubber seal | Plumbers, Tilers |
| Glazing and aluminium joinery | Excellent adhesion on glass and metal without corrosion | Glaziers, Window Installers |
| Roofing and flashing junctions | UV stable and weathertight seal under harsh conditions | Roofers, Builders |
| Vehicle and marine fabrication | Permanently flexible with resistance to vibration and moisture | Boat Builders, Auto Fabricators |
Applying N40 GP Silicone: Protocols & Best Practices
- Preparation: Ensure surfaces are dry, stable, and cleaned per substrate instructions.
- Masking: Use masking tape to achieve neat edges.
- Application: Apply using caulking gun, maintaining consistent bead size.
- Tooling: Smooth with a moistened spatula within 5 minutes of application.
- Curing: Allow to skin in approx. 10 minutes. Full cure at 2mm/day at 25°C/50% RH.
Limitations & Safety
- Not suitable for aquariums, submerged or swimming pool use
- Do not use on stone or trafficable horizontal joints
- Do not paint over cured silicone
- PPE: Wear gloves and eye protection when handling
- Ventilation: Use in a well-ventilated area
- First Aid: Flush eyes/skin with water. Do not induce vomiting. Call Poisons Centre if needed
N40 GP Silicone Sealant Adhesion & Preparation Guide
- Glass, Ceramic, Porcelain: Clean with white spirits using two-wipe method – Primer: 50A if required.
- Timber, Concrete, Masonry: Dry and dust-free – Primer: 2001 for porous surfaces.
- Aluminium, Colourbond, Zincalume: Degrease and abrade if oxidised – Primer: 50A recommended.
- PVC, Laminates: Wipe with solvent – Primer: Test adhesion or use 50A.
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