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Hi-Flex Construction: A Technical Overview
Hi-Flex Construction is a single-component, MS Polymer-based hybrid sealant designed for joint flexibility and adhesion across a wide range of materials and conditions. It cures via atmospheric humidity into a permanently elastic, weatherproof, and non-staining seal. With ±50% joint movement capability and resistance to UV, mould, corrosion, and water ingress, it’s ideal for internal and external joints requiring long-term durability. The sealant is non-toxic, low in VOCs (1.10%), and offers primerless adhesion on most non-porous substrates. Certified to ASTM C920-CLASS 50, it meets the demands of modern architecture, transport infrastructure, and modular builds.
1100%
Elongation at Break
Core Features & Specifications
- ±50% movement capability (ASTM C719)
- Extreme elongation: 1100% (ASTM D412)
- Compatible with concrete, masonry, timber, metal, fibreglass, plastics, and powder coat
- Cures to a permanently elastic, dustproof joint
- Non-staining and non-bleeding (ASTM C1248)
- Paintable with acrylic, oil, and rubber-based paints
- VOC compliant: 1.10% (USEPA)
- Neutral cure, non-toxic, solvent-free formulation
- Temperature resistant: -40°C to +100°C
- Shore A hardness: 25 (approx.)
The Hi-Flex Construction Advantage
- Superior joint flexibility for façade and precast construction
- Eliminates primer step on most non-porous substrates
- Long-term resistance to UV, moisture, and mould in harsh climates
- Suitable for sealing joints between materials with different thermal coefficients
- Low odour, non-corrosive, and compliant with Green Star requirements
Best Practices: Do's & Don'ts
Do
- Apply at temperatures between 5°C and 40°C
- Use open-cell backing rod or bond breaker tape to avoid 3-sided adhesion
- Prime porous surfaces with Everflex Supaprime when long-term adhesion is critical
- Tool off within 10 minutes using a moistened spatula
- Use masking tape for clean joint lines and remove before skin formation
Don't
- Do not use in long-term water immersion or pool environments
- Avoid applying in totally confined spaces—requires atmospheric humidity to cure
- Not suitable for mirrors, aquariums, or structural glazing
- Do not apply on bitumen, EPDM, or materials that leach plasticisers or solvents
- Avoid applying over damp or uncured substrates
Applications in Practice: Trade Scenarios
For Precast Installers (On-Site Applicator): Panel Joints and Tilt-Up Sealing
The Engineering Challenge
Tilt-up panel joints are exposed to harsh weather and require a sealant that handles wide thermal movement without cracking or discolouration.
The System-Based Solution with Hi-Flex Construction
Apply Hi-Flex Construction into prepared joints using open-cell backing rod. Its ±50% flexibility and non-staining formulation ensure durability and visual consistency, even across large panel spans.
Best Practice Note
For joint widths above 10mm, ensure a 2:1 width-to-depth ratio and tool sealant flat before skin forms (within 10 minutes).
For General Builders (Business Owner): Cladding and Curtain Wall Joints
The Engineering Challenge
Modern façade cladding systems demand flexible jointing solutions that can bond dissimilar materials under movement and exposure without compromising waterproofing.
The System-Based Solution with Hi-Flex Construction
Hi-Flex Construction adheres to powder-coated aluminium, fibreglass, and membrane substrates without primer, forming a durable, paintable, UV-stable joint across facades and curtain walls.
Best Practice Note
Slightly abrade powder coat prior to application. Pre-test adhesion on composite materials and avoid over-application of primers where used.
Performance Benchmark: Hi-Flex Construction vs. Standard Sealants
| Metric | Hi-Flex Construction | Standard Acrylic or Polyurethane | Advantage |
|---|---|---|---|
| Elongation at Break | 1100% Exceptional Flexibility | 200–400% | Handles extreme joint movement without failure |
| Movement Capability | ±50% Facade Rated | ±12–25% | Ideal for tilt panels and high-stress expansion joints |
| VOC Content | 1.10% Green Star Compliant | Up to 5–10% | Better for indoor air quality and low-odour installs |
Frequently Asked Questions About Hi-Flex Construction
Q: What is the best method for applying Hi-Flex Construction?
A: Ensure surfaces are clean and dry, use a sausage gun to apply in a continuous bead, and tool off within 10 minutes before skin formation.
Q: How does it perform in harsh weather conditions?
A: It maintains flexibility and adhesion under extreme UV exposure, rain, and temperature changes from -40°C to 100°C.
Q: Is it compatible with powder-coated aluminium?
A: Yes, Hi-Flex Construction adheres well to powder coat but preliminary adhesion testing is recommended for optimal results.
Q: What if the sealant bubbles during curing?
A: Bubbling is often due to moisture or air entrapment; ensure proper surface prep and avoid applying over damp substrates.
Q: What are the safety precautions when using this product?
A: Use gloves and eye protection, ensure good ventilation, and clean skin contact with soap and water. Avoid inhalation and ingestion.
Use Hi-Flex Construction for:
- Sealing expansion joints in tilt-up panels and facades
- Bonding in marine and automotive applications
- Perimeter sealing of windows and curtain walls
Why Use Hi-Flex Construction:
- Delivers long-term joint flexibility with ±50% movement
- Excellent UV resistance and durability in Australian climates
- Non-toxic and environmentally compliant for green projects
How to apply Hi-Flex Construction:
- Clean and prepare surface; remove contaminants using Xylene
- Mask joint edges if required; apply primer for critical joints
- Apply sealant using sausage gun at 45° angle; fill joint fully
- Tool within 10 minutes before skin formation; remove tape promptly
- Allow 3mm per 24 hours cure rate; clean tools with Xylene while wet
How to apply Hi-Flex Construction:
- Clean and prepare surface; remove contaminants using Xylene
- Mask joint edges if required; apply primer for critical joints
- Apply sealant using sausage gun at 45° angle; fill joint fully
- Tool within 10 minutes before skin formation; remove tape promptly
- Allow 3mm per 24 hours cure rate; clean tools with Xylene while wet
Safety precautions when using Hi-Flex Construction:
- Personal Protective Equipment: Gloves, safety glasses
- Ventilation: Use in well-ventilated areas
- Handling: Avoid contact with skin and eyes, do not ingest
- Dispose of according to local regulations; do not pour into drains
Hi-Flex Construction can be used on the following substrates:
- Concrete, masonry, and brick – ensure 28-day cure time for concrete
- Metals including galvanised steel, aluminium (except lead/copper)
- Timber, fibreglass, and plastics – test adhesion where uncertain
- Painted surfaces, stone (stain testing required), waterproof membranes
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