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Hi-Flex 50 MS Polymer Hybrid Sealant

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Price Per Unit: $10.90

Price Per Box: $9.81

The ultimate all-rounder sealant for trade professionals. Hi-Flex 50 is a paintable, UV-resistant MS Polymer sealant and adhesive that delivers a durable, flexible, and bubble-free seal on almost any substrate, with or without a primer.
Vendor: Adheseal
SKU: HIFLEX50GR/SSG
Availability: In Stock
$10.90
$10.90
Prices do not include GST
Physical Properties
Type of product: Ms polymer
Curing system: Neutral, moisture curing
Tack free time: 30 minutes @ 25°c, 50%rh
Density specific gravity: 1.64 +/- 0.05 astm d1475
Flammability: Non flammable
Rate cure: 3.0mm per 24hrs
Consistency: Non sagging smooth thixotropic paste
Elongation at break: 200% approx. astm d412
Suitable joint width: 5 – 50mm
Application temperature: 5°c to 40°c
Service temperature: -40°c to 100°c
Movement capability: +/- 25% astm c719
Hardness shore a: 35 approx. astm d2240
Voc: 1.5% (usepa)
Shelf life: 12 months
Clean up: Xylene, skin adheseal citrus wipes
Colours: Grey
Staining: Non staining as per - astm c510 & astm c1248
Shipping & Delivery

$15.95 + GST for Australia-wide shipping, excluding DG, oversized, long-length, and bagged items over 15kg. Rural, remote areas and site deliveries are also ineligible. If your order includes any of these, we will contact you to arrange additional freight fees. Online purchases only.

Use Hi-Flex 50 for: General construction sealing, waterproofing bond breakers, and light-duty bonding for virtually all common building materials, including powder-coated metals.

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:

For Builders and Carpenters:

  • Application Focus: Sealing Aluminium Window Frames to Brickwork/Fibre Cement
    • Micro-Guide: 1. Ensure surfaces are clean, dry, and sound. Mask edges for a neat finish. 2. Apply a continuous bead of Hi-Flex 50, ensuring good contact with both the powder-coated frame and the masonry/cladding. 3. Tool off within 10 minutes. 4. Remove masking tape immediately for a sharp edge.
    • Performance Benefits: Provides a durable, weatherproof, and flexible seal that accommodates movement between different materials. Its primerless adhesion to the powder coat saves a critical step.
    • Pro Tip: Push the bead of sealant ahead of the nozzle. This ensures the sealant is forced into the joint, creating a stronger, void-free seal.
    • Common Pitfall to Avoid: Poor surface preparation. Failing to remove dust or loose material will compromise adhesion, no matter how good the sealant is.

For Waterproofers:

  • Application Focus: Bond Breaker and Fillet Bead for Waterproofing Membranes
    • Micro-Guide: 1. Apply a triangular bead of Hi-Flex 50 into all wall/floor junctions and around penetrations. 2. Tool the bead to form a neat, coved fillet (typically 5mm x 5mm). 3. Allow the sealant to cure before applying the waterproofing membrane over the top.
    • Material Compatibility Notes: Expressly tested and compatible with Adheseal Everflex membranes (Aqua-Ban, WPM, etc.), ensuring the system integrity is maintained without any adverse reactions.
    • Performance Benefits: Creates the perfect non-adhesive surface (bond breaker) at the point of highest stress, allowing the waterproofing membrane to stretch and move freely without tearing.
    • Pro Tip: Use the triangular nozzle cutting guide in the TDS to create the perfect bead profile for fillets, saving time on tooling.
    • Common Pitfall to Avoid: Making the fillet too small. An undersized fillet won't create an effective bond breaker, compromising the performance of the entire waterproofing system.

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.

Frequently Asked Questions About Hi-Flex 50

Q: How strong is Hi-Flex 50 when used as an adhesive?

A: Hi-Flex 50 is an excellent adhesive for light-weight components where a permanent, flexible bond is required. It's ideal for items like acoustic ceiling tiles, display signs, or bonding panels in caravan manufacturing. For heavy-duty structural bonding, consider a dedicated high-strength adhesive like Adheseal Hi-Power.

Q: How soon can I paint over Hi-Flex 50 after applying it?

A: For best results, it's recommended to wait until the sealant has fully cured. As it cures at 3mm per 24 hours, a 6mm deep bead would be ready for painting in approximately 48 hours. Painting before a full cure can sometimes lead to the paint cracking if the sealant shrinks slightly during the final curing phase.

Q: Can I use Hi-Flex 50 to seal around a stone countertop?

A: While Hi-Flex 50 is certified non-staining on many materials, all natural stone is unique and can be porous. The official recommendation is to complete a stain testing program on an off-cut of the specific stone before use. For guaranteed non-staining performance on sensitive marble or granite, Adheseal S100 is the recommended product.

Q: Do I really need a primer for concrete?

A: While Hi-Flex 50 has good adhesion, concrete is a porous substrate and priming is highly recommended for optimal, long-term performance. Using Everflex Supaprime seals the concrete, prevents moisture from affecting the bond, and ensures the strongest possible adhesion, especially for critical external joints exposed to the weather.

Q: Is it suitable for sealing a boat deck made of fibreglass?

A: Absolutely. Hi-Flex 50 has excellent adhesion to fibreglass and outstanding UV and weathering resistance, making it ideal for marine applications like sealing and bonding components. However, it is not suitable for areas with long-term or permanent water immersion, such as below the waterline.

Applications Where Hi-Flex 50 Excels:

  • Window & Door Perimeters: Creates a durable, flexible, and weatherproof seal between aluminium/uPVC frames and various cladding materials like brick, concrete, and fibre cement sheet.
  • Waterproofing System Detailing: The perfect choice for creating bond breaker fillets at wall/floor junctions before applying liquid membranes, ensuring system compatibility and performance.
  • General Construction & Cladding: Ideal for sealing expansion joints in concrete panels, gaps in prefabricated buildings, and sealing bolted lap joints in metalwork.
  • Automotive, Caravan & Marine: An excellent sealant and adhesive for sealing seams and bonding light-weight components and panels where flexibility and UV resistance are essential.

Top Benefits of Using Hi-Flex 50 on Your Projects:

  • Ultimate Versatility: Replace multiple products with one. Its ability to act as a sealant, adhesive, and bond breaker on a huge range of substrates makes it the most useful tube on your van.
  • Enhanced Productivity: Work faster with confidence. Its primerless adhesion on many surfaces and bubble-free formulation means less prep time and no rework, saving you time and money.
  • A Superior Professional Finish: Deliver results that impress your clients. The non-staining, paintable formula allows for a clean, seamless finish that integrates perfectly with surrounding surfaces.
  • Long-Term Durability: Engineered to withstand harsh Australian conditions, its excellent UV resistance and +/- 25% movement capability mean fewer call-backs and a better reputation for quality work.

Step-by-Step Application Guide for Hi-Flex 50:

  1. Preparation is Paramount: Ensure the joint surfaces are structurally sound, clean, dry, and free of all dust, oil, and loose material. Mask the edges of the joint with tape for the neatest finish.
  2. Joint Design: For joints deeper than 10mm, insert an open-cell backer rod (e.g., Adhefoam) into the joint, ensuring it's 25% wider than the joint to create a firm fit. This controls sealant depth and prevents 3-sided adhesion.
  3. Priming (If Required): For porous surfaces or critical joints, apply the appropriate primer (Everflex Supaprime or Adheseal 50A) with a clean brush or cloth. Allow the primer to flash off for at least 30 minutes.
  4. Application Technique: Cut the sausage nozzle at a 45° angle to the desired bead size. Insert into a quality sausage gun. Apply the sealant by pushing the bead ahead of the nozzle, ensuring the sealant is forced into the joint and makes full contact with both sides.
  5. Tooling for a Professional Finish: Within 10 minutes of application, tool the sealant off with a dry spatula or gloved finger to create a smooth, concave finish. Apply light, consistent pressure.
  6. Clean-Up: Immediately remove the masking tape while the sealant is still wet, pulling it away from the joint. Clean any uncured excess sealant from tools or surfaces using a cloth with Xylene. Cured sealant must be removed mechanically.

Important Limitations & Safety When Using Hi-Flex 50:

Product Limitations:

  • Not for Underwater Use: Not suitable for applications involving continuous water immersion, such as swimming pools, spas, or below-the-waterline marine use.
  • Not for Structural Glazing: Lacks the specific rigidity required for structural glazing applications. Use a dedicated structural silicone like Adheseal N-80.
  • Not for Natural Stone (Without Testing): May cause discolouration on some sensitive stones. Always conduct a stain test on an offcut or use the recommended Adheseal S100 for stone.
  • Not for Certain Rubbers: Avoid use on bituminous surfaces or EPDM rubber, as leaching oils can interfere with the cure and bond.

Safety First – Protecting Yourself and Your Workspace:

  • Personal Protective Equipment (PPE): While Hi-Flex 50 is low-hazard, it is recommended to wear safety glasses and chemical-resistant gloves to prevent skin and eye contact.
  • Ventilation: Ensure good ventilation during application, especially when working indoors, to maintain a comfortable working environment.
  • Safe Handling Practices: This is a neutral cure sealant and is non-corrosive. Avoid eating or drinking while working. Wash hands thoroughly with soap and water after use.
  • First Aid Essentials: For accidental eye contact, flush with water for 15 minutes and seek medical advice. For skin contact, wipe off excess and wash with soap and water. For full details, refer to the Safety Data Sheet (SDS).

Hi-Flex 50 Adhesion Profile – Compatible Substrates:

  • Powder-Coated & Anodized Aluminium: Excellent primerless adhesion. Clean thoroughly with a two-wipe process using a suitable solvent to remove all residues before application for best results.
  • Concrete & Masonry: Good adhesion. For best long-term results, especially in exposed or damp conditions, prime the clean, dry surface with Everflex Supaprime. Ensure concrete is cured for at least 28 days.
  • Timber & Fibre Cement Sheet (FCS): Bonds extremely well. Ensure timber is dry and FCS is clean and dust-free. Can be painted to match the surrounding cladding or timber finish.
  • Metals (Steel, Stainless, Galvanized): Excellent adhesion. Ensure surfaces are clean and free of oil or corrosion. For critical applications, pre-treating with Adheseal 50A Surface Prep is recommended. Not suitable for lead or copper.
  • Waterproofing Membranes: Designed for purpose. Adheres perfectly to Adheseal's Everflex range to act as a compatible bond breaker system component.
Hi-Flex 50 MS Polymer Hybrid Sealant
Vendor: Adheseal
Hi-Flex 50 MS Polymer Hybrid Sealant
$10.90
Vendor: Adheseal
Hi-Flex 50 MS Polymer Hybrid Sealant
$10.90
Colour: Grey
Package Type: Single Buy

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