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Hi-Flex Construction +: A Technical Overview
Hi-Flex Construction + is a single-component, high-build MS polymer hybrid sealant that delivers primerless adhesion on most common construction substrates. The low-modulus formulation accommodates ±50% joint movement with excellent UV and weathering resistance, even in harsh Australian conditions. The Easy Tool – Low Mess formula guns smoothly and finishes cleanly, forming a permanent, elastic, dust-proof seal that resists bubbling in high humidity. Non-corrosive and low-VOC, it’s suitable for internal and external applications where reliability and clean presentation matter.
±50%
Joint Movement Capability (ASTM C920 Class 50)
Core Features & Specifications
- MS Polymer Hybrid; single-component, high-build; low odour; low VOC.
- Primerless adhesion to most non-porous substrates; strong bond on common building materials.
- Movement capability ±50%; low modulus for stress relief in dynamic joints.
- Excellent UV & weather resistance; non-staining, non-bleeding finish.
- Cure rate ~2–3 mm/24 h (at 23–25°C, 50% RH); skin ~10–15 min; working time ~25 min.
- Service temp −40°C to +100°C; application +5°C to +40°C.
- Shore A ~29 (14 days); elongation >600% (ISO 37); modulus ~0.41 MPa @100% (ASTM D412).
- Lap shear ~0.65 MPa (ASTM C961); UV resistance: 500 h – Good.
- Colours: White (9003), Grey (7047), Black (9011); 600 ml sausages.
The Hi-Flex Construction + Advantage
- Saves time: primerless on most non-porous substrates and easy tooling cuts clean-up and labour.
- Fewer call-backs: elastic recovery and low modulus manage movement without cracking.
- Site-tough: resists gassing/bubbling in humid conditions for a consistent finish.
- Versatile: bonds/seals across metals, masonry, timber, plastics and coated substrates.
- Professional finish: non-staining, paintable (test first; non-flexible paints may crack).
Proactive Troubleshooting
Scenario: Three-sided adhesion in facade joints
Potential Outcome: Restricted movement causes cohesive/adhesive failure or substrate stress.
Adheseal Best Practice: Use correct backer rod or bond-breaker tape to ensure two-sided adhesion per joint design guidance.
Scenario: Applying over dust, release agents or damp concrete
Potential Outcome: Poor adhesion and bubbling; premature failure.
Adheseal Best Practice: Clean using the two-wipe method with suitable solvent; ensure substrates are dry and concrete is cured (≥28 days) before application.
Applications in Practice: Trade Scenarios
For Builders (On-Site Applicator): Precast/Tilt-Up Expansion Joints
The Professional's Challenge
Movement and thermal cycling on exposed panels demand a flexible, UV-stable sealant that tools cleanly and stays put without primer delays.
The Adheseal Solution
Design joints at ~2:1 (width:depth). For 20 mm width, target ~10 mm depth with backer rod. Gun Hi-Flex Construction + and tool within 10–15 min for a smooth, elastic finish rated to ±50% movement.
Best Practice Note
Mask edges for crisp lines and remove tape before skin forms. Avoid trapping air while filling—continuous, steady bead prevents bubbles.
For Glaziers (Specifier/Installer): Perimeter Window Sealing
The Professional's Challenge
Modern facades require primerless bonding to powder-coated aluminium and glass with reliable UV stability and neat, low-mess presentation.
The Adheseal Solution
Lightly abrade non-porous frames, clean with appropriate surface prep, then apply a continuous bead and tool off for a weather-tight, non-staining seal that can be painted if required (test compatibility).
Best Practice Note
Maintain two-sided adhesion around frames by using bond-breaker tape on flat interfaces to allow thermal movement without stress.
For Fabricators (Business Owner/Operator): Aluminium & Panel Assembly
The Professional's Challenge
Need a clean, non-corrosive adhesive/sealant to bond dissimilar materials and manage differential movement with minimal rework.
The Adheseal Solution
Apply a triangular bead (nozzle cut at 90° then wedged) and compress parts to ≥2 mm final bond line. The low-modulus, high-elongation hybrid manages thermal mismatch without print-through.
Best Practice Note
For critical bonds, pre-treat metals and plastics as directed and verify adhesion with site pull tests before production runs.
Frequently Asked Questions
Do I need a primer on powder-coated aluminium or glazed tiles?
Usually no—Hi-Flex Construction + achieves strong primerless adhesion on many non-porous substrates. For critical or high-exposure applications, light abrasion and surface prep are recommended, with adhesion testing prior to installation.
What joint design should I use?
Aim for a ~2:1 width:depth ratio. Internal joints min 5 mm width/depth; external joints min 12 mm width. Use backer rod for joints >10 mm deep and avoid three-sided adhesion with bond-breaker tape.
Applications & Benefits
Applying Hi-Flex Construction +: Enhanced Protocols & Best Practices
-
Surface Preparation
Ensure substrates are structurally sound, clean, dry and free of dust, oils, release agents and moisture. Concrete must be cured ≥28 days.
Two-Wipe Method
Wipe with suitable solvent using a clean cloth; immediately follow with a second clean, dry wipe. Replace cloths frequently.
Edge Masking
Mask joint edges for neat lines; remove tape before skin forms.
Timing: Maintain a clean, dry surface immediately prior to application to avoid re-contamination.Pro Tip: Lightly abrade non-porous substrates to increase surface energy and improve wet-out. -
Priming & Pre-Treatment
Many non-porous substrates bond primerless after surface prep. For porous/critical joints, prime as specified and allow 30 min–2 h.
Non-Porous
Light abrasion then surface prep. Confirm with adhesion testing for critical works.
Porous
Apply primer by brush; allow to flash off (30 min–2 h) before sealing.
Timing: Respect the 30 min–2 h window between pre-treatment/primer and sealant application.Pro Tip: Primers enhance long-term adhesion; they do not compensate for poor cleaning. -
Joint Design & Backer
Target ~2:1 width:depth. Internal joints min 5 mm; external min 12 mm. Use backer rod for depth control; avoid three-sided adhesion with bond-breaker tape.
Open-Cell Backer Rod
Select rod ~25% larger than joint width; place to required depth.
Closed-Cell Backer Rod
Acceptable with care—do not damage the skin to avoid gassing.
Timing: Install backer and mask before loading sausage gun to reduce delays.Pro Tip: Keep bond line to two faces only; use tape on flat interfaces. -
Application & Tooling
Apply between +5°C and +40°C. Push the bead ahead of the nozzle to avoid air entrapment; fill completely and tool before skin forms (~10–15 min).
Joint Sealing
Cut nozzle at ~45° to joint width; maintain nozzle contact with both sides; tool with a moistened spatula.
As Adhesive
Cut nozzle at 90°; create triangular bead; assemble parts to ≥2 mm bond line.
Timing: Skin 10–15 min; working time ~25 min at 23–25°C/50% RH.Pro Tip: Remove masking while sealant is still wet for the sharpest edges.
Limitations & Safety
Product Limitations
Not suitable for long-term water immersion or internal swimming pools; avoid high chlorine exposure.
Will not cure in totally confined spaces without access to atmospheric humidity.
Not for aquariums, mirror adhesion, or structural glazing.
May discolour copper & brass; not for bituminous, natural rubber, EPDM, or substrates that leach oils/plasticisers/solvents.
Avoid applying over substrates with active moisture vapour transmission or where air entrapment can occur (bubbling risk).
Safety & Handling Requirements
Personal Protective Equipment
Wear gloves and safety glasses during application and clean-up. Wash hands before eating, drinking or smoking. Launder contaminated clothing before reuse.
Ventilation
Use in well-ventilated areas. Avoid inhaling vapours. For confined or poorly ventilated spaces, increase airflow and limit exposure time.
Fire & Handling
Keep away from ignition sources when using solvents for clean-up. Store sealed in a cool, dry place (10–35°C).
Emergency First Aid
Eyes:
Hold open and rinse with water for ≥15 minutes. Seek medical advice.
Skin:
Wash with soap and water; rinse thoroughly.
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.
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
Non-Porous Metals (Aluminium, Stainless, Galvanized, Powder Coat)
Surface Preparation
Lightly abrade with a fine abrasive pad; clean using appropriate surface prep with the two-wipe method. Ensure surfaces are dry and free from oil/contaminants.
Primer Requirements
Primer typically not required; use surface prep and confirm with adhesion test for critical works.
Allow 30 min–2 h between prep and application.
Adheseal 50A Surface PrepPorous Substrates (Concrete, Renders, Mortars, Bricks)
Surface Preparation
Substrates must be sound, clean, dry and cured—concrete ≥28 days. Remove dust, laitance, curing agents and contaminants.
Primer Requirements
Primer recommended for optimal adhesion and durability in critical/high-exposure joints.
Brush apply primer; allow 30 min–2 h before sealing.
Everflex SupaprimePlastics & PVC
Surface Preparation
Light abrasion then two-wipe clean. Verify compatibility; conduct adhesion tests.
Primer Requirements
Primer not typically required; confirm with testing for critical bonds.
Adheseal 50A Surface Prep
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| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Perimeter sealing of windows | Primerless adhesion, clean tooling, UV stability | Glaziers, Builders |
| Curtain walls & facade panels | Low modulus manages thermal movement | Glaziers, Facade Contractors |
| Precast / tilt-up expansion joints | ±50% movement; durable weather seal | Builders |
| Product | SKU | Description | Collection | Availability | Product Type | Other Details |
|---|