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Adheseal N-40 GP Silicone Sealant: A Product Overview
Adheseal N-40 is a neutral-cure, anti-fungal GP silicone built for clean, durable sealing on site—wet areas, metalwork, glazing details, and general construction joints where you need first-time-right confidence.
It’s UV stable, low odour, and stays permanently flexible across harsh temperature swings (from -50°C to 150°C). That flexibility is backed by high elastic recovery (>90%), so joints keep working through movement instead of cracking and coming back to bite you later.
With a low VOC level (43 g/L) and a fire test result to AS/NZS 1530.3 (Smoke Developed Index 0–1), it’s job-site ready for compliant work where detail matters—commercial fit-outs, kitchens, bathrooms, and external seals. Load the cartridge, tool it clean, and keep moving—zero doubt.
±30%
Movement capability to stay sealed through joint movement—no splitting, no rework.
Key Features of Adheseal N-40 GP Silicone Sealant
- Neutral (oxime) cure polysiloxane: designed to avoid corrosion on galvanised/zinc-coated steel and concrete, so your finish stays tidy and your materials stay protected.
- Anti-fungal additive: helps inhibit mould and biological growth in hot, humid zones—sanitary joints that don’t turn into a callback.
- Movement capability ±30%: flexes with seasonal shifts and vibration instead of cracking—predictable performance in real joints.
- Elastic recovery >90% (ISO 7389): rebounds after movement, so the seal keeps doing its job long-term.
- Temperature resistance -50°C to 150°C: handles Australian heat, cold snaps, and thermal cycling without going brittle.
- Low VOC 43 g/L (conforms to Rule 1168): supports low-emission project requirements without complicating application.
- Fire tested to AS/NZS 1530.3: Smoke Developed Index 0–1—useful when specs demand proof, not promises.
- Skin time ~10 minutes; tool-off window ~5 minutes: tool it early for a crisp line and a professional finish—no smears, no drama.
- Service-ready cartridge format (300 mL): straightforward loading and application with standard caulking guns—job-site ready.
- Colour options: Stark White (9003), Mid Grey (7038), Black (9011), Aluminium Grey (9023), Translucent—match common finishes without overthinking it.
The Adheseal N-40 GP Silicone Sealant Advantage
- Reduce rework on wet-area joints: anti-fungal performance and permanent flexibility help keep bathrooms, laundries, and kitchens sealed and presentable.
- Confidence on mixed substrates: adheres well to common construction materials including glass, tiles, aluminium, and coated metals—fewer “will it stick?” moments on site.
- Clean, fast workflow: single-pack, ready-to-use application means less mucking around—mask, gun, tool, and move on.
- Better risk control on specified jobs: low VOC and fire test data support spec-driven work and smoother sign-off.
- External durability where it counts: UV stability and wide service temperature range help keep exterior seals intact through harsh exposure.
Adheseal tips for using Adheseal N-40 GP Silicone Sealant
Scenario: Sealing onto a damp or contaminated surface
Potential Outcome: Poor adhesion and edge lift that turns into leaks, mould lines, and a return visit.
Adheseal Best Practice: Keep substrates dry, clean, and free of oils/grease. Use a two-wipe process on impervious surfaces and a suitable solvent such as white spirits. You’ll feel the surface “grab” slightly once contamination is gone—then you’re set for a predictable bond.
Scenario: 3-sided adhesion in flat joints
Potential Outcome: The joint can’t move properly, so it tears or de-bonds under movement—classic costly callback territory.
Adheseal Best Practice: Design joints to a 2:1 width-to-depth ratio where possible and prevent 3-sided adhesion using closed-cell polyethylene backing rod (about 25% larger than joint width) or a bond-breaker tape on flat joints. Done right, movement is absorbed cleanly and the seal stays tight.
Applications in Practice: Trade Scenarios
For Plumbers & Waterproofing Detail Work (On-site Applicator): Shower wall-to-floor joints
The Professional's Challenge
You need a sanitary seal that stays clean in hot, humid bathrooms—without edge lift, mould staining, or a joint that cracks when the building settles.
The Adheseal Solution
Prep the joint so it’s dry, sound, and contamination-free, then gun a steady bead with the nozzle held at 45°, keeping contact on both sides of the joint. Tool off before skin forms (tooling window ~5 minutes) for a smooth, waterproof finish that accommodates ±30% movement. Success means a clean handover and no return visits.
Best Practice Note
Mask edges for a sharper line, then remove tape while the sealant is still wet. Keep joint dimensions sensible: internal joints minimum 5 mm; use backing rod when depth exceeds 10 mm.
For Roofers & Sheet Metal (Business Owner / Operator): Colourbond and galvanised details
The Professional's Challenge
External joints cop full UV and thermal cycling. A seal that goes brittle or lets go creates leaks, brand damage, and margin loss on defects.
The Adheseal Solution
N-40’s UV stability and -50°C to 150°C service range support long-life exterior sealing. Apply in suitable conditions (installation guide: 5°C to 40°C), push the bead ahead of the nozzle so it’s pressed firmly into the joint, and tool early for a sealed edge that stays reliable. Success means fewer warranty claims and predictable performance across seasons.
Best Practice Note
Where adhesion is critical or substrates are unknown, run a compatibility/adhesion test first. Avoid contact with copper and brass where discolouration is a concern.
For Glaziers & Fit-out Crews (Specifier-Aware Installer): Non-structural perimeter sealing
The Professional's Challenge
You need a neat, low-odour seal on glass and surrounding finishes, but you can’t risk using the wrong silicone for structural glazing or mirror bonding.
The Adheseal Solution
Use N-40 for general perimeter and sanitary sealing where a tough, flexible silicone is required. Keep it to two-sided adhesion and joint sizes within the guide (max width 30 mm, max depth 15 mm). For structural glazing or mirror bonding, follow the limitations and select the specified product instead. Success means a compliant detail and no surprises on inspection.
Best Practice Note
N-40 is not paintable. If the finish must be painted, choose a paint-compatible system from the outset—don’t gamble at the end of the job.
Frequently Asked Questions
How long does Adheseal N-40 GP Silicone take to skin and cure?
Adheseal N-40 GP Silicone typically skins in about 10 minutes and cures at about 2 mm per day at 25°C and 50% humidity. Tool the bead within roughly 5 minutes for the cleanest line. Cure speed varies with atmospheric conditions and substrate porosity, so plan your handover accordingly for predictable performance.
Is Adheseal N-40 GP Silicone compliant for low-smoke or fire-tested projects?
Adheseal N-40 GP Silicone is fire tested to AS/NZS 1530.3 with a Smoke Developed Index of 0–1. That’s the sort of proof that helps on specified work and inspections. It’s a smart choice when you want documented performance rather than guessing and risking rework.
Can you use Adheseal N-40 GP Silicone in commercial kitchens and food preparation areas?
Adheseal N-40 GP Silicone is stated as safe to use in food preparation areas and is widely used in commercial kitchens and laundries. Prep properly (clean, dry, contamination-free) and tool it early for a sealed, sanitary joint. The payoff is a cleaner finish and fewer hygiene-related callbacks.
Do I need a primer before applying Adheseal N-40 GP Silicone?
Primer use for Adheseal N-40 GP Silicone is substrate-dependent, so an adhesion test is recommended on critical work. Where primer is needed, use Primer 50A for non-porous substrates and Primer 2001 for porous substrates. That small step removes doubt and helps prevent edge lift and delamination later.
Can Adheseal N-40 GP Silicone be used underwater or in swimming pools?
Adheseal N-40 GP Silicone is not suitable for underwater applications, including swimming pools. If the joint will be permanently submerged, follow the limitation and select a system designed for that exposure. Making the right call upfront is how you avoid no-win callbacks.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Shower wall-to-floor and wall-to-wall joints | Anti-fungal, flexible seal helps resist mould and joint cracking in humid wet areas | Plumbers, builders, tilers |
| Commercial kitchens and laundries | Low odour, sanitary sealing with low VOC for a cleaner, compliant finish | Builders, shopfitters, facility maintenance |
| External sealing on Colourbond/Zincalume/galvanised details | UV stable with -50°C to 150°C resistance for long-life weather exposure | Roofers, sheet metal workers, builders |
| General construction and shopfitting joints | Single-pack, ready-to-use workflow for fast sealing and reduced rework | Builders, carpenters, shopfitters |
| Marine and vehicle fabrication sealing (non-underwater joints) | Tough, flexible sealant that tolerates vibration and movement (±30%) | Fabricators, marine/boat builders |
| Sealing electrical installations and air conditioning penetrations | Maintains a waterproof flexible joint where movement and thermal cycling occur | Electricians, HVAC installers |
Applying Adheseal N-40 GP Silicone Sealant: Enhanced Protocols & Best Practices
-
1) Surface Preparation (Don’t skip it)
Surfaces must be structurally sound, stable, dry, and free of dust, loose material, oils/grease, release agents, curing compounds, and other contaminants.
Impervious substrates (tiles, glass, metal)
Use a two-wipe process with clean cloths. A suitable cleaner/solvent such as white spirits may be used; change cloths frequently to avoid spreading contamination.
Concrete and porous surfaces
Ensure concrete is cured for at least 28 days and fully dry. Remove dust/friable material so the sealant can key properly.
Timing: Plan prep so the joint is dry—sealing over dampness invites adhesion failures.Pro Tip: Mask joint edges before gunning for a neater finish and faster clean-up—less rework, cleaner handover. -
2) Priming (When the job can’t fail)
An adhesion test is recommended. Where primer is necessary, apply with a small brush and allow several minutes for solvent evaporation before sealing.
Non-porous substrates
Use Primer 50A where required after testing.
Porous substrates
Use Primer 2001 where required after testing.
Timing: Allow primer solvent to evaporate before applying sealant.Pro Tip: Priming only where needed protects margin—target it to critical joints and remove doubt where it counts. -
3) Joint Design & Backing (Let the joint move)
Aim for a 2:1 width-to-depth ratio where possible. Internal joints: minimum 5 mm width/depth; external joints: minimum 10 mm. Maximum joint width is 30 mm and depth 15 mm.
Backing rod for deeper joints
For joints greater than 10 mm deep, use a closed-cell polyethylene backing rod about 25% larger than the joint width to control depth.
Prevent 3-sided adhesion
On flat joints, use a polyethylene tape or release agent so the sealant bonds to two sides only—movement works as designed.
Timing: Set backing and masking before gunning—continuous workflow, cleaner finish.Pro Tip: Two-sided adhesion is how you get predictable performance from a ±30% movement sealant—skip it and you invite tearing. -
4) Install, Tool & Clean Up (Finish like a pro)
Apply between 5°C and 40°C (installation guide). Cut the nozzle at 45°, keep the tip in contact with both sides of the joint, and apply by pushing sealant ahead of the nozzle to force it firmly into place.
Tooling
Tool off with a moistened spatula before skin forms (tooling window ~5 minutes) for a smooth joint.
Clean-up
While wet, clean tools and spills with white spirit. Once cured, removal is by mechanical means.
Timing: Typical skin time is ~10 minutes; cure rate is ~2 mm/day at 25°C and 50% humidity.Pro Tip: Remove masking tape while the sealant is still wet—clean edges, faster tidy-up, and no costly callbacks over appearance.
Limitations & Safety
Product Limitations
Not suitable for totally confined spaces where atmospheric humidity can’t reach the sealant (it requires humidity to cure).
Not suitable for aquariums.
Not for adhering mirrors. High Power 609 can be used (test first).
Not for structural glazing. Use N-80 or N-60 Glazing silicone as specified for glazing applications.
Not recommended for composite panels. Adheseal recommends PU50FC (test first).
Not suitable for underwater applications, including swimming pools.
Some stone may stain—complete a stain testing program before use on stone.
Not for horizontal walkways or trafficable areas.
Not suitable for polycarbonate sheeting.
May discolour copper and brass. Avoid contact where aesthetics matter.
Do not treat with cleaning agents/solvents that may affect or discolour the sealant, particularly during curing.
This silicone is not paintable. Do not paint over silicone.
Safety & Handling Requirements
Personal Protective Equipment
PPE must be suitable for the task and hazards identified by your site risk assessment. Use appropriate eye and skin protection as required for sealing and solvent clean-up activities.
Ventilation Requirements
Ensure adequate ventilation, particularly when using solvents for surface prep or clean-up. Avoid working in totally confined spaces where curing humidity cannot reach the sealant.
Fire & Handling Precautions
Handle solvents used for prep/clean-up with care. Keep away from ignition sources and follow site handling procedures for flammable materials.
Emergency First Aid
Eyes:
Brush away loose particles. If irritation occurs, flush with lukewarm gentle flowing water for 5 minutes or until removed. Obtain medical advice if irritation becomes painful or persists.
Skin:
Brush away loose particles. If irritation occurs, flush with lukewarm gentle flowing water for 5 minutes or until removed.
Inhaled:
First aid is not generally required. If in doubt, contact a Poisons Information Centre or a doctor.
Swallowed:
Do not induce vomiting. Wash mouth with water and give some water to drink. If symptoms persist, contact a Poisons Information Centre or a doctor.
Seek medical attention immediately in all cases of serious exposure.
Poisons Information Centre: Australia 131 126, New Zealand 0800 764 766.
Adheseal N-40 GP Silicone Sealant Application Guide
Non-porous: Glass, Glazed Tiles, Porcelain, Enamel, Laminates
Surface Preparation
Use a two-wipe process and keep the surface dry, clean, and contamination-free. Remove oils/grease and change cloths frequently. A suitable cleaner/solvent such as white spirits may be used on impervious substrates.
Primer Requirements
Primer recommended where adhesion is critical (test first)
If a primer is required after testing, apply with a small brush and allow several minutes for solvent evaporation before sealing.
Primer 50A (for non-porous substrates)Metals: Colourbond, Zincalume, Galvanised Steel, Aluminium
Surface Preparation
Ensure surfaces are structurally sound and free of dust, loose material, oil, grease, and release agents. Keep substrates free from surface water and continual dampness to avoid adhesion issues.
Primer Requirements
Primer may be required on critical details (test first)
Run a quick compatibility/adhesion test before committing on unknown coatings or mixed materials.
Primer 50A (for non-porous substrates)Porous: Concrete, Masonry, Cementitious Surfaces
Surface Preparation
Concrete must cure for at least 28 days. Remove dust and friable material and ensure the substrate is dry—continual dampness can compromise adhesion and cause delamination.
Primer Requirements
Primer recommended for optimal adhesion (test first)
Where primer is needed, brush-apply and allow time for solvent to evaporate before applying sealant.
Primer 2001 (for porous substrates)Timber: Treated Wood and Common Building Timbers
Surface Preparation
Timber must be dry, stable, and clean. Remove dust and surface contaminants that can block adhesion, and avoid sealing onto wet timber where moisture can interfere with performance.
Primer Requirements
Primer may be required depending on timber treatment (test first)
Always test where contact with potentially incompatible treatments or materials occurs.
Primer 2001 (porous) or Primer 50A (non-porous areas) — select after testing- Choosing a selection results in a full page refresh.