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Hi-Flex Construction +: A Technical Overview
Hi-Flex Construction + is a single-component, neutral-cure MS Polymer hybrid with low modulus and exceptional elasticity. Its ±50% movement capability maintains seal integrity through thermal cycling and substrate movement. The non-staining, non-corrosive formulation adheres to most construction materials — including metals, concrete/masonry, timber, many plastics, powder coat and glass — often without primer. It guns cleanly, tools smoothly, and cures to a permanently elastic, dust-tight, waterproof seal that resists UV, weather and mould in Australian conditions.
±50%
Movement Capability (ASTM C719)
Core Features & Specifications
- Neutral-cure, low-modulus MS Polymer hybrid; single-component, ready to use.
- Movement capability ±50% to absorb joint movement without cohesive failure.
- Primerless adhesion on many non-porous and porous substrates (verify with site tests).
- Non-staining / non-bleeding; suitable for sensitive finishes (complete stain test on stone).
- Excellent UV and weathering resistance for durable exterior performance.
- Paintable with many acrylic, oil and rubber-based paints (check compatibility; rigid films may crack on movement).
- Low odour, solvent- and isocyanate-free; low VOC content.
- Application temperature 5–40 °C; service temperature −40–100 °C.
- Skin ~10 min; cure rate ~3 mm/24 h @ 25 °C/50% RH (conditions dependent).
- Complies with ASTM C920 Class 50; non-staining as per ASTM C510 & C1248.
- Colours: White (9003), Grey (7047), Black (9011); 600 ml sausages.
The Hi-Flex Construction + Advantage
- Confidence in movement: low-modulus elasticity and ±50% capability minimise edge tearing.
- Efficient application: easy gunning and generous tooling window for neat, repeatable finishes.
- Substrate versatility: adheres to common façade and window materials to simplify procurement.
- Long-term aesthetics: non-staining, non-corrosive formulation protects sensitive finishes.
Proactive Troubleshooting
Scenario: Damp/contaminated substrate
Potential Outcome: Adhesion loss, blistering, or delamination.
Adheseal Best Practice: Ensure substrates are sound, dry and clean; remove release agents/oils/dust. Use two-wipe solvent prep on impervious surfaces and allow full flash-off.
Scenario: Three-sided adhesion
Potential Outcome: Tear failure due to restraint.
Adheseal Best Practice: Use open-cell backer rod (~25% larger than joint width) or bond-breaker tape; target ~2:1 width:depth geometry.
Applications in Practice: Trade Scenarios
For Glaziers (On-site Applicator): Window Perimeter Seals
The Professional's Challenge
Achieve a neat, durable perimeter seal over powder-coated frames and masonry returns with movement and UV exposure.
The Adheseal Solution: Engineered Certainty in Practice
Lightly abrade and solvent-wipe frames; prime porous masonry where required. Gun a continuous bead and tool within ~10 minutes for full wetting. ±50% movement accommodates seasonal cycling without edge tearing.
Best Practice Note
Mask edges for crisp lines; remove tape before skin. Verify paint compatibility before overcoating.
For Builders (Business Owner/Operator): Precast & Tilt-Up Expansion Joints
The Professional's Challenge
Control labour time and minimise rework on large joint runs exposed to heat, wind and ongoing movement.
The Adheseal Solution: Engineered Certainty in Practice
Design joints ~2:1 width:depth; install backer rod for depth control and two-sided adhesion. Apply a steady bead and tool for full contact. Fast skin and robust elasticity reduce sag and accommodate panel movement, limiting call-backs.
Best Practice Note
Prime porous concrete where critical (multi-storey, immersion or high stress). Allow new concrete to cure ≥28 days before sealing.
Frequently Asked Questions
What joint geometry delivers best movement performance?
Target approximately 2:1 width:depth. Use open-cell backer rod about 25% larger than joint width to control depth and prevent three-sided adhesion. For internals, aim for ≥5 mm width & depth; externals ≥12 mm width.
Do I need a primer on every substrate?
Often no primer is required due to strong adhesion. For critical/high-stress joints or porous substrates, use the recommended primer and follow open-time guidance. Always conduct on-site adhesion tests.
How fast does it skin and cure?
Typical skin time is ~10 minutes, with a cure rate ~3 mm per 24 h from exposed surfaces at 25 °C and 50% RH. Conditions and substrate porosity will affect cure speed.
Can I paint over the sealant?
Yes — with many acrylic, oil and rubber-based paints. Check compatibility first. Rigid paint films may crack over moving joints; trial an inconspicuous area.
Where is it not suitable?
Not suitable for long-term immersion (including pools/aquariums), structural glazing, or mirror adhesion (use a dedicated mirror adhesive). Avoid fresh contact with solvents/alcohols during cure and with bituminous/EPDM/natural rubber substrates.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Perimeter window sealing | Primerless adhesion to metals & masonry; durable weather seal | Glaziers, Builders |
| Curtain wall & façade joints | UV-stable, low-modulus elasticity minimises edge tearing | Façade Contractors |
| Precast/tilt-up expansion joints | ±50% movement; neat tooling for long runs | Builders |
| Cladding terminations & penetrations | Non-staining seal around sensitive finishes | Builders, Roofers |
| General construction sealing & light bonding | Single-component, low odour; reliable grab | Multi-Trade |
Applying Hi-Flex Construction +: Enhanced Protocols & Best Practices
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Surface Preparation
Substrates must be sound, stable, dry and free of release agents, oils and dust. New concrete should cure ≥28 days.
Two-Wipe (Non-Porous)
Solvent-wipe with clean cloths; replace frequently; allow complete flash-off before sealing.
Prime Porous Substrates
Brush-apply primer; allow 30–120 minutes open time prior to sealant application.
Timing: Proceed when surfaces are clean/dry and primer is within open time.Pro Tip: Mask joint edges for crisp lines; remove tape before skin. -
Joint Design & Backing
Target ~2:1 width:depth. Use open-cell backer rod ≈25% larger than joint width. For shallow joints, use bond-breaker tape to prevent three-sided adhesion.
Pro Tip: Internal joints: ≥5 mm width & depth; external joints: ≥12 mm width. -
Application
Apply at 5–40 °C. Fill joints completely without entrapping air. Hold gun at ~45° for seals (push the bead) and at 90° for triangular adhesive beads.
Timing: Tool within ~10 minutes before skin forms.Pro Tip: For adhesive use, compress the triangular bead to ≥2 mm to maximise contact. -
Tooling & Finishing
Tool with a moistened spatula to compact and smooth the bead. Remove masking tape before skin formation.
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Cure & Clean-Up
Allow cure at ~3 mm/24 h from exposed surfaces (25 °C/50% RH). Clean tools/spills while wet with suitable solvent; remove cured residues mechanically. Use hand wipes for skin.
Limitations & Safety
Product Limitations
Not suitable for long-term water immersion (including pools/aquariums).
Not for structural glazing or mirror adhesion (use a dedicated mirror product after testing).
Avoid use on bituminous materials and natural/EPDM rubber; avoid fresh contact with solvents/alcohols during cure.
May discolour copper and brass — perform compatibility testing first.
Requires atmospheric humidity to cure — do not apply in totally confined spaces.
Safety & Handling Requirements
Personal Protective Equipment
Wear gloves and safety glasses. Wash hands before eating, drinking or smoking. Launder contaminated clothing before reuse.
Ventilation Requirements
Use in well-ventilated areas. Avoid vapour build-up; ensure adequate airflow for moisture-cure chemistry.
Fire & Handling Precautions
Keep ignition sources away when using solvents for cleaning. Observe storage conditions and shelf-life.
Emergency First Aid
Eyes:
Hold open; flush with water for ≥15 min. Seek medical advice.
Skin:
Wash with soap and water; remove contaminated clothing.
Inhaled:
Move to fresh air; obtain medical attention if symptoms persist.
Swallowed:
Do not induce vomiting. Seek medical advice immediately.
Seek medical attention immediately in all cases of serious exposure.
Hi-Flex Construction + Application Guide
Aluminium, Stainless, Galvanised/Zinc, Powder Coat, Glazed Tiles
Surface Preparation
Lightly abrade glossy finishes; two-wipe solvent clean with fresh cloths; allow full flash-off. Surfaces must be dry and dust-free.
Primer Requirements
Primer typically not required; recommended for critical applications.
Use adhesion promoter where specified.
Adheseal 50A Surface PrepConcrete, Brick, Mortar, Renders (Porous)
Surface Preparation
Cure new concrete ≥28 days. Remove laitance/dust/contaminants. Substrates must be dry, sound and stable.
Primer Requirements
Primer recommended for optimal long-term adhesion.
Brush-apply primer; allow 30–120 minutes open time before sealing.
Everflex SupaprimePVC & Plastics
Surface Preparation
Light abrasion and solvent wipe. Due to plasticiser variation, verify adhesion with site tests.
Primer Requirements
Optional; confirm by testing.
Use adhesion promoter if required after trials.
Adheseal 50A Surface PrepTimber & Painted Surfaces
Surface Preparation
Ensure coatings are sound, clean and dry. Lightly abrade and remove dust.
Primer Requirements
Typically not required on sound coatings; test first.
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—Waterproof Membranes & Fibreglass
Surface Preparation
Clean thoroughly; ensure dry, sound surfaces. Light abrasion can improve key on glossy gel-coats.
Primer Requirements
Primer optional; confirm by testing on representative areas.
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Adheseal 50A Surface Prep
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