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Sealant Calculator
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Adheseal N70 is a high-performance neutral oxime cure sealant specifically engineered for expansion and control joints in commercial masonry, glazing, and industrial infrastructure. This formulation provides a Shore A hardness of 25-30 and ±50% movement capability, allowing contractors to maintain bond integrity in high-traffic driveways and building facades subjected to extreme thermal expansion.
To ensure maximum performance, apply at a 2:1 width-to-depth ratio with a backing rod to prevent three-sided adhesion, resulting in a UV-stable, non-corrosive seal that is rated for below-waterline applications once fully cured.
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)