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Adheseal Silicone N80: A Technical Overview
Adheseal N-80 is a 100% pure, neutral curing architectural grade silicone sealant engineered for the most demanding structural glazing, construction, and engineering applications. Formulated without extenders or plasticisers, it delivers exceptional, long-term performance, UV stability, and colour fastness. N-80 is exceptionally easy to apply and tool, curing via atmospheric humidity to form a permanently elastic, dust-proof, and waterproof seal.
Designed to function as a high-performance flexible gasket, it is ideal for sealing joints between dissimilar materials and accommodating high movement in construction and manufacturing. Its low VOC formulation meets "Green Star" environmental criteria, making it a preferred choice for modern, compliant building projects where air quality is a priority.
±30%
Dynamic Joint Movement Capability, accommodating significant structural shifts and thermal expansion to prevent sealant failure.
Core Features & Specifications
- 100% Pure Silicone Polymer: Delivers maximum durability, colour stability, and resistance to shrinking or cracking over time, unlike extended or filled sealants.
- Neutral Cure System (Oxime): Non-corrosive and safe for use on sensitive and metallic substrates like galvanised steel, zinc, aluminium, and concrete without causing damage or staining.
- Exceptional Movement Capability (±30%): Accommodates extreme joint expansion and contraction, making it ideal for high-movement façade, structural, and perimeter joints.
- Low VOC Formulation (43 g/L): Meets Green Star environmental criteria, ensuring suitability for internal applications and projects with strict air quality standards.
- Broad Service Temperature Range (-50°C to 150°C): Maintains permanent flexibility and adhesion through the most extreme Australian climate conditions, from alpine winters to desert heat.
- Mould & Mildew Resistant: Formulated with inhibitors to resist biological growth, making it perfect for high-humidity areas like bathrooms, kitchens, and around pools.
The Adheseal Silicone N80 Advantage
- Reduce Costly Call-Backs: The 100% pure silicone formulation provides superior longevity and UV resistance, ensuring a reliable seal that won't fail, protecting your reputation and bottom line.
- Achieve Design & Compliance Confidence: Specified for architectural structural glazing with a ±30% movement capability and low VOC compliance, N-80 meets the technical demands of engineers and Green Star requirements.
- Increase On-Site Efficiency: Exceptionally smooth to gun and tool, with a 10-minute skin time that allows for a perfect finish without rush, getting the job done right the first time.
- Guarantee System Compatibility: The neutral cure chemistry is non-corrosive, ensuring guaranteed adhesion and performance on a huge range of building materials including glass, aluminium, steel, ceramics and sanitary acrylics.
Best Practices: Do's & Don'ts
Do
- Always prepare non-porous surfaces with the two-wipe solvent process (e.g., Adheseal IPA Cleaner) for optimal adhesion.
- Use an open-cell backing rod in joints deeper than 10mm to ensure correct sealant depth and prevent 3-sided adhesion.
- Tool the sealant surface within 5 minutes of application for a professional, clean-edged finish.
- Conduct a preliminary stain test when using on porous natural stone to ensure aesthetic compatibility.
Don't
- Never apply in a totally enclosed space, as the sealant requires atmospheric moisture to cure correctly.
- Do not use for structural applications involving composite panels or for adhering mirrors.
- Avoid painting over the cured sealant, as paint will not adhere to the low-energy silicone surface.
- Do not allow contact with unapproved cleaning agents or solvents during cure, as they can cause discolouration.
Applications in Practice: Trade Scenarios
For Glaziers & Façade Engineers: Structural Butt & Cap Beading
The Engineering Challenge
Sealing structural glass façades where high movement from thermal cycling and wind load is expected, and long-term UV resistance is critical to prevent premature sealant degradation and failure.
The System-Based Solution with N-80
Use N-80 for weather sealing butt joints and cap beads, ensuring a minimum 5mm sealant bite onto both surfaces. Its ±30% movement capability handles dynamic loads, while its pure silicone base guarantees no loss of adhesion or colour fade from harsh UV exposure.
Best Practice Note
For optimal adhesion on powder-coated aluminium frames or anodised finishes, prepare the surface with Adheseal IPA Cleaner using the two-wipe method. Ensure the backing rod is placed correctly to achieve a 2:1 width-to-depth ratio for the sealant joint.
For Tilers & Builders: Resilient Wet Area & Perimeter Joints
The Engineering Challenge
Creating a durable, waterproof, and mould-resistant seal in high-humidity environments like bathrooms, laundries, and kitchens, particularly in movement-prone wall-to-floor and corner junctions.
The System-Based Solution with N-80
Apply a 5mm minimum bead of N-80 into perimeter and connection joints for tiles, splashbacks, and sanitaryware. Its neutral cure is compatible with ceramic tiles, acrylics, and metals, while active fungicides inhibit mould growth. The ±30% flexibility prevents cracking when substrates inevitably move.
Best Practice Note
After application, tool the sealant with a spatula moistened with a non-soap-based solution to create a clean, concave profile. This ensures water runs off the joint surface effectively, enhancing long-term performance. Remove masking tape immediately after tooling for the sharpest lines.
Performance Benchmark: N-80 vs. Standard Sealants
| Metric | Adheseal Silicone N-80 | Standard Alternative | Advantage |
|---|---|---|---|
| Joint Movement Capability | ±30% Excellent | ±25% | Superior flexibility reduces the risk of cohesive failure in dynamic and high-movement joints. |
| Base Polymer | 100% Pure Silicone Superior Durability | Filled / Extended Silicone | Guarantees long-term UV resistance and performance integrity without shrinkage or plasticiser bleed. |
| Substrate Compatibility | Non-Corrosive Neutral Cure Safe for all Metals | Acetoxy (Acid) Cure | Will not corrode sensitive metals like zinc, copper, brass or galvanised steel, or attack concrete. |
| VOC Content | 43 g/L Green Star Compliant | >50 g/L | Safer for installers and building occupants; suitable for environmentally sensitive or internal projects. |
Frequently Asked Questions
Is the Aluminium Grey colour suitable for Colorbond®?
Yes. N40 GP Silicone in Aluminium Grey has been formulated to visually match aluminium panels and metallic finishes such as Colorbond®, zincalume, and powder-coated steel. It's widely used in cladding and façade detailing.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Architectural Façade & Cladding Sealing | Colour-matched finish for aluminium and Colorbond® | Builders, Cladding Contractors |
| Bathroom & Kitchen Sealing | Anti-fungal, mould-resistant and flexible in wet areas | Plumbers, Builders, Tilers |
| Window & Glazing Seals | UV stable with no corrosion on metal frames | Glaziers, Builders |
| Aircon, Electrical & Roofing Penetrations | Permanently flexible for vibration-prone installations | HVAC, Electricians, Roofers |
Applying N40 GP Silicone Sealant: Enhanced Protocols & Best Practices
-
1. Surface Preparation
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.
Tiling / Sanitary
Wipe with white spirit, dry, and mask adjacent tiles to avoid smears.
Metal or Cladding
Degrease aluminium and coated steel with solvent wipes. Do not sand powder-coated surfaces.
Timing: Clean immediately prior to sealing to reduce dust recontamination.Pro Tip: Change cloths frequently and use fresh solvent to avoid spreading grime. -
2. Joint Design & Backing
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.
Interior Seals
Minimum joint: 5mm x 5mm. Foam rod used where depth exceeds 6mm.
Expansion / External
Use closed-cell rod 25% larger than joint width. Prevents excessive sealant consumption and ensures optimal joint movement.
Timing: Install rod before sealant to control bond geometry.Pro Tip: Ensure sealant adheres to only two sides — never all three — to prevent premature failure. -
3. Sealant Application
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.
Manual Application
Use even pressure on trigger. Apply a continuous bead with no gaps. Avoid pulling the gun, which may create air pockets.
Compressed Air Gun
Set to 2–3 bar for controlled dispensing. Suitable for long runs or professional joinery use.
Timing: Tool off within 5 minutes. Skin time is ~10 minutes at 25°C, 50% RH.Pro Tip: Use a wet spatula for tooling. Remove masking tape before skin forms to achieve clean edges. -
4. Curing & Cleanup
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.
Uncured Silicone
Wipe immediately with lint-free cloth dampened with solvent. Tooling residue can be cleaned with white spirit.
Cured Silicone
Remove mechanically using a scraper or silicone removal tool. Avoid harsh abrasives.
Timing: Allow 24 hours per 2mm depth of sealant for full cure at 25°C and 50% RH.Pro Tip: Avoid washing or painting over joints during cure. Protect from foot traffic or weather until full set.
Limitations & Safety
Product Limitations
Not suitable for structural glazing – use N-80 or N-60 instead.
Do not use in aquariums or submerged applications. Not rated for underwater adhesion.
Unsuitable for use on natural stone surfaces – may cause staining. Perform stain testing or use specialist stone silicone.
Not recommended for horizontal trafficable joints (e.g., walkways or tiled floors).
Avoid using on polycarbonate sheets. Compatibility issues may lead to discoloration or failure.
Not paintable – use paintable acrylic sealant if surface coating is required.
Safety & Handling Requirements
Personal Protective Equipment
Wear nitrile gloves and safety glasses when applying. Avoid prolonged skin contact. Suitable protective clothing should be worn if working in overhead applications.
Ventilation Requirements
Use in a well-ventilated area. Avoid inhaling vapours during application and cure. Mechanical ventilation may be required in enclosed spaces.
Fire & Handling Precautions
Keep away from open flame or ignition sources during application. Store in cool, dry conditions away from oxidising agents.
Emergency First Aid
Eyes:
Flush with lukewarm, gentle flowing water for at least 5 minutes. Seek medical attention if irritation persists.
Skin:
Wipe off excess, wash skin with soap and water. If irritation develops, consult a doctor.
Inhaled:
Move to fresh air. Seek medical attention if symptoms such as dizziness or headache persist.
Swallowed:
Do not induce vomiting. Rinse mouth and drink water. Contact Poisons Information Centre or doctor immediately.
Seek medical attention immediately in all cases of serious exposure.
N40 GP Silicone Sealant Application Guide
Glass & Ceramic Tiles
Surface Preparation
Clean using a two-cloth method and white spirit. Remove soap residue, oil, and dust. Dry completely before sealing.
No primer typically required
Ensure surface is sound, dry and free from film or treatment residues.
Aluminium, Zincalume & Colorbond®
Surface Preparation
Degrease with clean solvent cloths. Avoid abrading coated or anodised surfaces. Do not apply to oxidised or flaking finishes.
Primer recommended for optimal adhesion
Use Primer 50A in critical joints or where long-term water exposure is expected.
Primer 50ATimber, Plywood & Laminated Surfaces
Surface Preparation
Ensure substrate is dry, stable, and free from dust or treatment residues. Lightly sand glossy finishes and wipe down.
Primer required for porous substrates
Use Primer 2001 for raw or absorbent timber substrates.
Primer 2001PVC & Plastics
Surface Preparation
Clean gently using white spirit. Avoid aggressive solvents or abrasives. Dry fully before applying sealant.
Primer recommended for optimal adhesion
Use Primer 50A for high-movement joints or vertical surfaces.
Primer 50AConcrete, Masonry & Cement Sheeting
Surface Preparation
Allow full cure (28 days for concrete). Remove laitance and debris. Surface must be dry and free from curing compounds.
Primer required for porous substrates
Apply Primer 2001 and allow to flash off before sealing.
Primer 2001
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