Use Megapoxy HT for: Concrete and steel bonding, crack repairs, and underwater applications where a high-strength, water-tolerant adhesive is required.
Megapoxy HT is a 100% solids, resin-based, solvent-free, hydrophilic epoxy gel adhesive designed for demanding applications. Its key feature is its ability to bond and cure in damp or even underwater conditions, making it invaluable for marine and civil engineering projects. The product boasts impressive mechanical properties, including a compressive strength of 100 MPa and a modulus of elasticity of 11 GPa, ensuring structural integrity. It's also resistant to hydrogen sulphide, a common challenge in sewage treatment plants. This versatile epoxy gel is suitable for everything from concrete crack repair and steel anchoring to creating high-strength epoxy mortars. And importantly, it's VOC-free, contributing to a healthier work environment.
Primer Information: Proper surface preparation is vital. Concrete must be free of grease, oil, and laitance, typically achieved through mechanical abrasion or acid etching. Steel should be grit blasted to AS CK 9.4 standards, or mechanically abraded and degreased. Removing any existing coatings is crucial for optimal bond strength.
Cure Time: At 25°C, the work time is 30 minutes. Cure times vary with temperature: 48 hours at 15°C, 24 hours at 25°C, and 12 hours at 35°C. Ensure the product is given sufficient time to cure, especially in cooler conditions.
Coverage Rate: Coverage will vary depending on the application. For coatings, 1 to 1.5 litres per square metre is recommended. For crack filling or bonding, the amount needed will depend on the dimensions of the area.
Application Temperature Range: The minimum application temperature is 10°C. Application outside this range may affect curing and performance.
Chemical Properties: Megapoxy HT is notable for its resistance to a range of chemicals, including hydrogen sulphide. It's also a 100% solids formulation, meaning it doesn't shrink during curing.
Key Features of Megapoxy HT
- Hydrophilic Nature: Bonds effectively in damp or underwater environments.
- High Structural Strength: Compressive strength of 100 MPa and modulus of elasticity of 11 GPa.
- Versatile Applications: Suitable for bonding, crack repair, mortars, and coatings.
- Chemical Resistance: Resistant to hydrogen sulphide.
- VOC Free: Contributes to a safer working environment.
Why Choose Megapoxy HT:
- Reliability: Consistent performance in challenging conditions.
- Durability: High strength and chemical resistance ensure long-lasting repairs.
- Versatility: Reduces the need for multiple products on site.
- Safety: VOC-free formulation.
When to Choose Megapoxy HT versus Alternatives:
- Choose Megapoxy HT over standard epoxy adhesives when: The application involves damp conditions, underwater work, or exposure to hydrogen sulphide.
- Consider other options when: A very rapid cure is needed, as Megapoxy HT has standard cure times for epoxy systems.
Trade-Specific Applications for Megapoxy HT:
For Civil Engineers:
- Concrete Crack Repair: Restoring structural integrity to damaged concrete.
- Steel Anchoring: Securing steel components to concrete structures.
- Infrastructure Repair: General repairs to bridges, tunnels, and other civil works.
For Marine Contractors:
- Underwater Repairs: Repairing concrete and steel structures in marine environments.
- Piling Repairs: Strengthening and repairing wharf and jetty piles.
For Water Treatment Plant Operators:
- Sewerage Infrastructure: Repairs to concrete and steel in sewage treatment facilities.
- Potable Water Facilities: General repairs to water treatment plants.
Application Information
- Required Tools: Mixing containers, trowels, brushes, rollers (for coatings), and appropriate safety gear.
- Trade-Specific Tips: Thorough mixing in the correct ratio is critical. For underwater applications, specific techniques may be required.
- Common Issues and Solutions: Poor mixing leads to inadequate curing. Insufficient surface preparation reduces bond strength.
Storage and Shelf Life
- Storage Requirements: Store in a cool, dry place away from direct sunlight.
- Shelf Life Information: Refer to the product packaging for specific details.
- Temperature Considerations: Avoid extreme temperatures during storage.
Certifications and Compliance
- VOC Free: Complies with Australian safety standards.
- ASTM Standards Compliance: Meets relevant ASTM standards for its properties.
Frequently Asked Questions About Megapoxy HT
Q: Can Megapoxy HT be used for vertical and overhead concrete repairs?
A: Yes, Megapoxy HT's gel consistency makes it suitable for vertical and overhead applications. It's designed to adhere to surfaces without sagging, which is crucial for these types of repairs.
Q: How does Megapoxy HT perform in underwater conditions?
A: Megapoxy HT is specifically formulated to be hydrophilic, meaning it can displace water and bond effectively to surfaces that are damp or even submerged. This makes it ideal for underwater repair work.
Q: What is the correct mixing ratio for Megapoxy HT?
A: The correct mixing ratio is 3 parts of Part A to 1 part of Part B by volume. Accurate measurement and thorough mixing are essential for the product to cure properly and achieve its full strength.
Q: Is Megapoxy HT resistant to chemical exposure?
A: Yes, Megapoxy HT exhibits excellent chemical resistance, including resistance to hydrogen sulphide. This makes it suitable for use in environments where chemical exposure is a concern, such as sewage treatment plants.
Q: What surface preparation is required for steel before using Megapoxy HT?
A: Steel surfaces should be grit blasted to AS CK 9.4 - 1964 Class 3 finish. If this isn't possible, mechanically abrade the surface to a clean, bright metal finish and degrease it thoroughly.
Q: What safety precautions should be followed when using Megapoxy HT?
A: It's important to wear appropriate personal protective equipment (PPE), including gloves and eye protection. Ensure adequate ventilation, and avoid skin and eye contact. Refer to the Safety Data Sheet for detailed safety guidelines.
Use Megapoxy HT for:
- New to Old Concrete Bonding: Creating a strong bond between new and existing concrete, essential for construction and repair work.
- Concrete Crack Repair: Filling and reinforcing cracks in concrete structures to restore their integrity.
- Steel Anchoring: Securing steel bolts or other fixtures into concrete.
- Underwater Repairs: Repairing concrete or steel structures in marine or submerged environments.
Why Use Megapoxy HT for:
- Water Tolerance: Its hydrophilic nature makes it effective in damp or underwater conditions.
- High Strength: Provides excellent structural strength for demanding applications.
- Versatility: Suitable for a range of applications, reducing the need for multiple products.
- Durability: Resistant to chemical exposure and environmental factors.
How to apply Megapoxy HT:
- Prepare Surfaces: Ensure surfaces are clean, dry, and free from contaminants. For concrete, remove any laitance. For steel, grit blast or mechanically abrade.
- Mix Components: Combine 3 parts of Part A with 1 part of Part B by volume. Mix thoroughly for several minutes until a uniform colour and consistency are achieved.
- Apply Adhesive: Apply the mixed Megapoxy HT to the prepared surfaces using a trowel, brush, or other suitable applicator.
- Bond Materials: Bring the materials to be bonded together and hold or clamp them in place until the adhesive has cured.
- Clean Up: Clean tools and any spills with Megapoxy Thinners before the adhesive cures.
Megapoxy HT limitations:
- Mixing Ratio: Accurate measurement of the mixing ratio is crucial. Incorrect ratios can lead to poor curing and reduced strength.
- Surface Preparation: Proper surface preparation is essential. Contaminated or poorly prepared surfaces will compromise the bond.
- Cure Time: While versatile, Megapoxy HT has typical epoxy cure times. It's not designed for very rapid bonding applications.
Megapoxy HT can be used on the following substrates:
- Concrete: For bonding new to old concrete, repairing cracks, and general concrete repairs. Surface preparation is critical to ensure a strong bond.
- Steel: For anchoring steel and bonding steel components. Proper surface preparation, such as grit blasting, is necessary.
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