Every breakthrough and progress
It is our continuous pursuit of technological innovation
Every breakthrough and progress
It is our continuous pursuit of technological innovation
In Southeast Asia, South Asia, and the coastal regions of Southern China, high humidity, long rainy seasons, and high water tables are common conditions. Projects such as bridges, docks, tunnels, and basements often face damp substrates or even waterlogged environments. Conventional epoxy curing agents tend to suffer from amine blushing, poor adhesion, and incomplete curing when exposed to water, leading to construction delays or substandard quality.
Highfar HF-8450 is a modified mixed amine epoxy curing agent specifically developed to address the challenges of damp and underwater construction.
HF-8450 is insoluble in water and has a density greater than water. After mixing, it settles in water and remains in the application area without being washed away. It can complete crosslinking curing with epoxy resin even when fully submerged, without interference from water. On damp substrates such as wet concrete or water-covered steel, HF-8450 also provides good adhesion, eliminating the need to wait for the substrate to become completely dry. At low temperatures of 5°C, full curing is achieved within 72 hours, making it suitable for different climatic conditions.
In terms of technical parameters, HF-8450 appears as a light yellow to transparent brown liquid with a color no higher than Gardner 9. Its viscosity at 25°C is 800 to 2000 mPa·s, with an amine value of 320 mg KOH/g and an active hydrogen equivalent weight of 115 g/eq. When used with a liquid epoxy resin having an EEW of 190, the recommended dosage is 60 phr. At 25°C, the gel time is 40 to 60 minutes, with full curing achieved in 48 hours. At 5°C, full curing is achieved in 72 hours.
The Southeast Asian and South Asian markets are key regions for this type of product. Countries such as Indonesia, the Philippines, Vietnam, Thailand, Malaysia, Singapore, Bangladesh, and India experience hot, humid climates and long rainy seasons, with a large number of infrastructure projects situated in damp or submerged environments.
Specific applications include:
Underwater concrete repair: On-site repair of bridge piers, dock piles, and dam cracks. HF-8450 can be injected directly into underwater work areas without the need for cofferdams or dewatering.
Wet-surface anticorrosive coatings: Sewage treatment tanks, cooling towers, and underground diaphragm walls that are persistently damp or have water seepage.
Underwater bonding: Repair and fixing of submarine pipelines, underwater cable joints, and offshore platform facilities.
Damp environment flooring: Primers and mid-coats for basements, underground parking garages, and food processing plants where surface moisture compromises adhesion.
In humid and rainy regions, the main challenge of epoxy construction is not the material itself but the interference of environmental moisture with the curing process. Through its modified amine design, HF-8450 enables epoxy systems to cure properly in underwater and high-humidity environments, providing a reliable technical solution for construction projects in tropical, subtropical, and coastal areas.
For samples or technical support, please contact the Highfar team.
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