Adheseal Hi-Flex 60 MS polymer Adhesive

When the job demands a sealant that sticks to metal sheeting, flashings, and gutters without a primer, and then takes paint without cracking, Hi-Flex 60 delivers. You need a seal that won't compromise the finish or degrade under Australian sun. This is the product that performs. It holds tight, stays flexible, and maintains its integrity on your most exposed metalwork.

Why this product exists

Hi-Flex 60 was engineered to meet the specific demands of sheet metal construction. It's an isocyanate-free MS Polymer sealant with outstanding primerless adhesion to common roofing and cladding metals like Colorbond, galvanised steel, aluminium, and Zincalume. Unlike traditional silicone sealants, Hi-Flex 60 is paintable, allowing seamless integration with painted metal components. Its formulation provides excellent UV and weathering resistance, ensuring long-term durability in exposed conditions, preventing premature degradation and callbacks.

The numbers that matter

• Movement Capability: +/- 25% (ASTM C719): Sheet metal and building panels expand and contract significantly with temperature changes. This 25% movement rating ensures Hi-Flex 60 flexes with the substrate, maintaining a watertight seal without stressing the bond line, reducing the risk of splits or adhesion failure.
• Hardness: Shore A 55 (ASTM D2240): A high Shore A hardness of 55 provides robust resistance to physical attack, making Hi-Flex 60 well suited for demanding public environments such as schools, transport facilities, and other high-traffic areas where durability is essential.
• Elongation at Break: 200% (ASTM D412): This high elongation value provides a significant safety margin. Even when pushed to its movement limits, the sealant retains ample capacity to stretch, preventing premature rupture and ensuring joint integrity over time.
• VOC Content: 1.5 gm/lt: A very low VOC content contributes to improved indoor air quality and helps projects meet Green Star environmental criteria, supporting healthier construction practices without compromising performance.

What it's like to use

Hi-Flex 60 is designed for user-friendly application. Surfaces must be clean, dry, and free of contaminants. For non-porous substrates like metals, roughen the surface slightly with an abrasive pad, then clean using a two-wipe process with Xylene. For critical applications on non-porous surfaces, or metals like copper/brass, use Adheseal 50A Surface Prep. For porous surfaces such as concrete or brick, prime with Everflex Supaprime. Tool the sealant immediately after application, within its approximately 10-minute skin time, using a moistened spatula for a smooth finish. Clean up uncured product and tools with Xylene; cured material requires mechanical removal. For skin contact, use Adheseal Hand Wipes. Apply between 5°C and 40°C.

Where this product excels

• Sheet Metal Fabrication: Use for seam sealing and bolted lap joints in HVAC ductwork, metal enclosures, and general sheet metal work where robust, flexible adhesion is required across different thermal expansion coefficients.
• Metal Roofing and Cladding: Ideal for sealing overlaps, end laps, flashings, and cappings on metal roofs and wall cladding, including Colorbond, galvanised steel, and Zincalume. It maintains a weatherproof seal that can be painted to match the surrounding finish.
• Guttering and Downpipes: Provides a durable, non-corrosive seal for joints in gutters and downpipes, accommodating movement and resisting weathering without staining the metal.
• Public Area Applications: Its high Shore A hardness makes it suitable for joints in schools, prisons, and other public areas where a durable, tamper-resistant seal is required.

How it fits in a real system

Hi-Flex 60 typically serves as the primary sealant in exterior construction where metal components are prevalent. Its primerless adhesion to most common construction metals simplifies installation, but for optimal, long-term performance in high-stress or extreme exposure joints, consider a primer. On non-porous surfaces like aluminium or powder-coated metals, a wipe with Adheseal 50A Surface Prep enhances adhesion. For porous substrates like concrete or masonry, prepare the surface with Everflex Supaprime. Control joint depth with an open-cell backer rod from the Adheseal backer rod range, ensuring a 2:1 width-to-depth ratio for optimal movement. Always prevent three-sided adhesion by using backer rod or a bond breaker tape.

Choose this when

• When you need a sealant that offers outstanding primerless adhesion to a wide range of common construction metals like Colorbond, galvanised steel, aluminium, and Zincalume.
• When the sealed joint will be exposed to significant UV radiation and weathering, requiring excellent long-term durability and colour stability.
• When the sealant needs to be paintable with acrylic, oil, or rubber-based paints to seamlessly integrate with adjacent painted surfaces.
• When sealing joints in public areas where a high-hardness, durable sealant is required for long-term performance and resistance to wear.

Don't use this when

• Not for: Long-term water immersion or internal swimming pool applications, especially with high chlorine exposure, as this can degrade the sealant.
• Not for: Totally confined spaces, as the sealant requires atmospheric humidity to cure properly.
• Not for: Structural glazing or adhering mirrors. For structural glazing, consider glazing-specific silicones like N-80 or N-60.
• Not for: Direct contact with copper and brass where discolouration of the metal is unacceptable; always test adhesion and compatibility on these metals.
• Not for: Use on bituminous, natural rubber, or EPDM rubber surfaces, or in conjunction with materials that leach oils, plasticisers, or solvents.

Related products

• Adheseal Hi-Flex 50
• Adheseal Hi-Flex Construction Plus
• Adheseal PU50