Hi-Flex 50 MS Polymer Hybrid Sealant

Hi-Flex 50 is the high-performance "multi-tool" you need. Based on advanced Hybrid MS Polymer technology, it delivers the best of all worlds: the outstanding flexibility and UV resistance of a silicone with the paintability and strength of a polyurethane. Engineered for Australian conditions, it provides a tough, permanently elastic seal that resists bubbling in humidity and won't stain or corrode surfaces. Whether you're sealing a window, bonding a panel, or detailing a waterproofing membrane, Hi-Flex 50 delivers a reliable, professional result every time.

Product Details:

Primer Information: One of Hi-Flex 50's greatest strengths is its outstanding primerless adhesion to most common non-porous substrates, including aluminium, powder-coated metals, and steel. For critical, high-stress applications or porous surfaces like concrete and masonry, priming is recommended to guarantee long-term performance. Use Adheseal 50A Surface Prep for non-porous surfaces and Everflex Supaprime for porous substrates.

Cure Time: Work faster and move on to the next task sooner. Hi-Flex 50 skins over in approximately 30 minutes at 25°C, reducing the risk of dust contamination. It cures at a rate of 3mm per 24 hours, allowing for painting and light service much faster than many traditional sealants.

Coverage Rate: A single 600ml sausage goes a long way. For a standard 10mm x 10mm construction joint, you can expect to get 6 linear metres per sausage. For a 5mm waterproofing fillet bead, you will achieve approximately 48 linear metres.

Joint Design: For optimal performance in expansion joints, maintain a 2:1 width-to-depth ratio, with a minimum joint size of 5mm x 5mm. For joints deeper than 10mm, always use an open-cell backing rod (like Adhefoam) to ensure correct sealant depth and prevent three-sided adhesion, allowing the sealant to move freely.

Paintability: Achieve a truly seamless finish. Hi-Flex 50 is fully compatible with most acrylic, oil, and rubber-based paints. Its non-staining formulation ensures no bleed-through or discolouration, providing a clean, professional look that lasts. A preliminary test is always recommended to ensure paint compatibility.

Key Features of Hi-Flex 50 & What They Mean For You

• Advanced Hybrid MS Polymer Formula: Get the ultimate all-in-one performance. It’s permanently flexible, paintable, non-staining, and UV stable, meaning you can use one product for a huge range of applications.
• Outstanding Primerless Adhesion: Save time and labour costs on site. It bonds tenaciously to most non-porous surfaces like powder-coat aluminium, metals, and plastics without the need for a primer.
• Resists Gassing and Bubbling: Achieve a flawless, professional finish every time. This formula is engineered to resist bubbling, even when applying in the hot and humid conditions common to Queensland and coastal Australia.
• Movement Capability of +/- 25%: Install with confidence in dynamic joints. It easily accommodates building movement and thermal expansion/contraction, ensuring a durable, weatherproof seal that won't crack or fail.
• Isocyanate & Solvent Free: A smarter and safer choice for you and your clients. This low-odour, low-VOC formula meets Green Star environmental criteria and is non-corrosive to metals.

Why Choose Hi-Flex 50:

• Problem: "Tired of sealants that can't be painted, leading to a poor finish."
  Solution with Hi-Flex 50: Its advanced MS Polymer chemistry is fully paintable with common acrylic and oil-based paints, allowing for a clean, integrated finish that makes your work look truly professional.
• Problem: "Wasting time and money priming every single joint."
  Solution with Hi-Flex 50: For most common non-porous substrates like aluminium and steel, Hi-Flex 50’s powerful formulation provides a strong, reliable bond without the need for a primer, getting your job done faster.
• Problem: "My current sealant bubbles and ruins the finish when it's hot and humid."
  Solution with Hi-Flex 50: It's specifically formulated to be resistant to gassing during cure. This means you can work confidently in humid conditions and still achieve a smooth, bubble-free surface, avoiding costly rework.

When to Choose Hi-Flex 50 Over Other Options:

• Choose Hi-Flex 50 over "standard silicone sealants" when: you need to paint the joint. Silicones are generally not paintable and can be difficult to get a neat finish with. Hi-Flex 50 offers a paintable, non-staining alternative with excellent flexibility.
• Choose Hi-Flex 50 over "traditional polyurethane sealants" when: you need better UV resistance and a safer product. Hi-Flex 50 is isocyanate-free and less prone to breaking down under harsh Australian sun than many polyurethanes.
• Hi-Flex 50 is particularly effective for: All-purpose sealing of dissimilar materials (e.g., aluminium to concrete), creating compatible bond breaker fillets for waterproofing systems, and any application where a paintable, flexible, non-staining finish is critical.
• Consider other Adheseal solutions when: performing structural glazing (use Adheseal N-80), sealing natural stone (test first, or use Adheseal S100), or for continuous underwater immersion.

Trade-Specific Applications & Pro Tips for Hi-Flex 50:

How to use Hi-Flex 50

• Essential Tools & Setup: A quality sausage gun, sharp utility knife, tooling spatulas, masking tape, and cleaning cloths.
• Surface Preparation – The Key to Success: All substrates must be sound, clean, dry, and free of any dust, oil, or loose material. For non-porous surfaces, a two-wipe process with a suitable solvent (like Xylene) is recommended to remove invisible contaminants.
• Trade-Specific Pro Tips for Optimal Results: When tooling off, use a dry spatula or a gloved finger. While some trades use soapy water, this can interfere with the cure and paintability of MS Polymers. Dry tooling gives the best result.
• Troubleshooting Common On-Site Issues:
  • Issue: "Poor adhesion to a substrate." Solution: The surface was likely not cleaned properly, or it's a difficult plastic that requires specific priming. Re-clean thoroughly with the two-wipe method or conduct an adhesion test with a primer.
  • Issue: "The sealant isn't curing." Solution: Ensure the sealant has access to atmospheric moisture. It will not cure in a totally confined space. Also, check the expiry date on the packaging.

Storage, Shelf Life, and Handling

• Optimal Storage Conditions: Store in a cool, dry place below 30°C, away from direct sunlight. This ensures the product reaches its full 12-month shelf life.
• Handling & Disposal: This is a low-hazard product, but standard safe practices apply. Avoid contact with skin and eyes, and ensure good ventilation during use. Dispose of cured sealant responsibly as per local guidelines.

Certifications and Compliance

• Low VOC / Green Star: Hi-Flex 50 is a low-VOC formulation that meets the environmental criteria for use on Green Star-rated building projects.
• Non-Staining: Independently tested to ASTM C510 and ASTM C1248 standards, proving it will not stain or discolour adjacent porous surfaces.
• Movement Class (± 25%): Certified to ASTM C719 for a high range of joint movement, guaranteeing its performance in dynamic and expansion joints.