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Adheseal N70 Industrial Silicone: A Technical Overview
N70 is a neutral-curing (oxime) industrial-grade silicone engineered for professional joint sealing on dense, glazed, and non-porous substrates. It skins quickly for efficient tooling and cures to a permanently elastic, dust-tight joint with ±50% movement capability. With ~600% elongation and >90% elastic recovery, it absorbs thermal and structural movement without cracking, reducing callbacks. Low odour and non-corrosive to galvanised/zinc-coated steel and concrete, it’s suitable for internal and external work, is UV-stable and colour-fast, and—once fully cured—is suitable for seals below the waterline.
Core Features & Specifications
- Neutral-cure (oxime) silicone—safe on metals and cementitious surfaces; won’t corrode galvanised/zinc or attack concrete.
- Joint movement capability ±50% with elastic recovery >90%—maintains seals under thermal cycling and vibration.
- High elongation (~600%) and Shore A 25–30—durable, flexible joint with robust tear resistance.
- UV-stable, colour-fast—reliable weathering performance for exterior joints.
- Fast skin (~15 min @ 25 °C, 50% RH) and cures ~2 mm/day—speeds tooling and handover.
- Internal & external; once cured suitable for below-waterline seals—broad application scope.
- Low odour single-pack—no mixing; clean up uncured residue with white spirits or turps.
- Accepts backer rod; recommended 2:1 width:depth ratio; max joint width 30 mm, depth 15 mm.
The Adheseal N70 Advantage
- Professional finish—smooth tooling window with a neat, matt-finish joint.
- Reliability under movement—prevents edge debonding and cracking on dense surfaces like glass and glazed tiles.
- Trade-friendly handling—low odour, neutral-cure chemistry supports indoor use and sensitive substrates.
- Australian job-site ready—wide service temperature resistance (-50 °C to +150 °C) for diverse climates.
Proactive Troubleshooting
Scenario: Sealing over damp or contaminated joints on glazed tiles
Potential Outcome: Adhesion loss or edge staining leading to early joint failure and callbacks.
Adheseal Best Practice: Ensure substrates are clean, dry and free of oils/solvents. Use a two-wipe solvent clean on impervious surfaces with fresh cloths; mask edges and tool before skin forms.
Scenario: Three-sided adhesion in deep joints
Potential Outcome: Cohesive tearing or premature failure under movement.
Adheseal Best Practice: Control depth with closed-cell polyethylene backer rod (≈25% larger than joint width). Aim for 2:1 width:depth and bond to two sides only.
Applications in Practice: Trade Scenarios
For Glaziers (On-site Applicator): Perimeter glazing to aluminium frames
The Professional's Challenge
Achieving a clean, durable seal on non-porous glass and powder-coated aluminium where thermal cycling and UV exposure are constant.
The Adheseal Solution
Degrease with a two-wipe method; mask edges. Gun N70 with a steady push-bead at ~45°. Tool within ~5 minutes to compact and wet the flanks. The neutral-cure chemistry prevents metal corrosion; ±50% movement handles frame drift.
Best Practice Note
Use backer rod to prevent three-sided adhesion; target 2:1 width:depth for a resilient hourglass profile.
Frequently Asked Questions
What’s the recommended joint design for durable movement accommodation?
Use a 2:1 width:depth profile with closed-cell backer rod to avoid three-sided adhesion. Keep depth ≤15 mm (max width 30 mm). This allows the joint to compress/extend with ±50% movement without tearing.
When can N70 be tooled and exposed to moisture?
Tool within ~5 minutes before skin forms. Allow curing at approximately 2 mm/day at 25 °C and 50% RH. Avoid early immersion until a full cure is achieved.
Is N70 suitable for aquariums or mirrors?
No. Aquariums and mirror bonding are excluded. For mirrors, a dedicated mirror-safe adhesive is required (refer to Adheseal guidance and test first). For composite panels, consult Adheseal Hi Flex Construction (test suitability first).
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Movement joints in glazed wall/floor finishes | ±50% movement; high elongation; UV stability | Tilers, Builders |
| Perimeter sealing of sinks, sanitary ware and benchtops | Neutral-cure, mould-resistant, clean tooling | Plumbers, Joiners |
| Glazing to aluminium/glass interfaces | Non-corrosive to metals; low odour; fast skin | Glaziers |
| External façade/sealant joints | UV-stable, colour-fast, durable weathering | Builders, Remedial |
| Below-waterline seals (after full cure) | Waterproof, elastic joint retains flex under load | Marine/Remedial |
Surface Preparation
Ensure joint flanks are sound, dry and clean—free from dust, oils, release agents and moisture. For impervious substrates, use a fresh-cloth two-wipe solvent clean.
Two-Wipe Solvent Clean
Wipe with a solvent-dampened lint-free cloth; immediately follow with a dry cloth. Replace cloths frequently. Suitable solvent: 100% white spirits.
Masking
Mask both edges tightly to control bead geometry and prevent edge smearing. Remove tape while sealant is still wet.
Timing: Proceed once surfaces are visibly dry; avoid sealing on damp or cooling-condensing substrates.
Pro Tip: Concrete must cure ≥28 days before sealing to avoid adhesion loss.
Priming & Joint Design
Adhesion tests are recommended. Prime where required and design the joint to move: 2:1 width:depth; max width 30 mm; max depth 15 mm; use backer rod where depth >10 mm.
Primer Selection
50A for non-porous; Everflex Supaprime for porous. Apply thinly by brush and allow several minutes for solvent evaporation.
Backer Rod
Insert closed-cell polyethylene rod approx. 25% larger than joint width to control depth and prevent three-sided adhesion.
Timing: Prime immediately before sealing; allow solvent flash-off before gunning.
Pro Tip: Keep joint depth consistent for a uniform hourglass bead that tolerates ±50% movement.
Gunning & Tooling
Apply between +5 °C and +40 °C ambient. Cut nozzle at 45°; push-gun the bead with the nozzle contacting both flanks. Tool within ~5 minutes to compact the sealant and achieve a smooth finish.
Push-Bead Technique
Maintain a steady pace; keep the nozzle ahead of the bead to force sealant into the joint and wet both sides.
Tooling
Lightly moisten a spatula and form a concave profile for maximum movement capability. Clean excess while wet.
Timing: Skin ~15 minutes @ 25 °C/50% RH. Cure ~2 mm/day—allow full cure before sustained immersion.
Pro Tip: Remove masking tape immediately after tooling while the sealant is still wet.
Product Limitations
Do not use in totally confined spaces—N70 requires atmospheric humidity to cure.
Not suitable for aquariums.
Not for mirror bonding (use a dedicated mirror adhesive; test first).
Not recommended on some composite panels (consult Adheseal Hi Flex Construction; test suitability first).
Some natural stones may stain—complete a stain test first (marble and granite recommended only after stain test).
Not suitable for polycarbonate sheeting; may discolour copper and brass. Not paintable.
Safety & Handling Requirements
Personal Protective Equipment
Wear suitable gloves and eye protection during application and tooling. Use protective clothing as identified by your site risk assessment.
Ventilation Requirements
Ensure adequate ventilation, particularly for interior work. Avoid vapour build-up in enclosed spaces.
Fire & Handling Precautions
Keep away from ignition sources during solvent cleaning/priming. Store sealed containers in a cool, dry place (5–30 °C).
Emergency First Aid
Eyes:
Gently brush away loose particles; flush with lukewarm water for ~5 minutes. Seek medical advice if irritation persists.
Skin:
Wipe away uncured material; wash with lukewarm water. If irritation occurs, rinse for ~5 minutes.
Inhaled:
Move to fresh air. If symptoms persist, contact a Poisons Information Centre or a doctor.
Swallowed:
Do not induce vomiting. Rinse mouth and give water to drink; seek medical advice.
Seek medical attention immediately in all cases of serious exposure.
Glass & Glazed Ceramic Tile
Surface Preparation
Substrates must be sound, clean, dry and free from oils/films. Use a two-wipe solvent clean on impervious surfaces with fresh, lint-free cloths; do not reuse dirty cloths.
Primer Requirements
No primer typically required; test adhesion.
If needed, apply a thin primer coat and allow solvent to evaporate for several minutes.
Adheseal 50A (non-porous)Aluminium & Enamel
Surface Preparation
Degrease thoroughly; remove oxide layers where present. Keep flanks dry prior to sealant gunning.
Primer Requirements
Primer may improve edge adhesion; test first.
Allow primer solvent to flash off before sealing.
Adheseal 50A (non-porous)Porous Masonry (Cementitious)
Surface Preparation
Substrate must be cured (≥28 days), dry, clean and dust-free. Remove curing compounds and release agents.
Primer Requirements
Primer recommended for optimal adhesion.
Brush primer into joint flanks; allow several minutes for solvent evaporation.
Adheseal Everflex Supaprime (porous)Laminated Benchtops & Porcelain/Fibreglass
Surface Preparation
Clean oils and residues; ensure surface is dry. Mask edges for neat finish and remove tape while sealant is wet.
Primer Requirements
No primer typically required; confirm with adhesion test.
Proceed with N70 once flanks are prepared and dry.
Adheseal 50A (non-porous)