Every breakthrough and progress
It is our continuous pursuit of technological innovation
Every breakthrough and progress
It is our continuous pursuit of technological innovation
Carbon fiber is made from polyacrylonitrile (PAN), pitch, or rayon through high-temperature carbonization. Its diameter is typically 5-10 microns, much thinner than a human hair. Despite its thinness, its tensile strength is 5-10 times that of steel, while its density is only about one-quarter that of steel.
Single carbon fibers cannot be used directly. They are typically woven into carbon fabric, then impregnated with epoxy resin and cured to form carbon fiber composite materials. This is similar to steel bars in concrete—carbon fiber provides strength, while epoxy resin provides shape and load transfer.
Carbon fabric adhesive is a specialized epoxy bonding material used to bond carbon fiber fabric to concrete or steel surfaces, primarily for building structure reinforcement. When a building has insufficient load-bearing capacity, fails to meet seismic standards, or is damaged, carbon fiber fabric can be applied to the surface to increase structural strength.
Carbon fabric adhesive consists of epoxy resin and curing agent, mixed on site. The mixture is applied to carbon fiber fabric, which is then bonded to the substrate. After curing, the fabric and substrate form a single unit that bears loads together.
Working window: On-site operations such as cutting fabric, applying adhesive, bonding, and rolling must be completed before gelation. A gel time that is too short leaves insufficient working time, while too long delays the project. A gel time of 35-45 minutes is generally ideal.
High hardness and strength: The cured adhesive layer must transfer loads from carbon fiber to the substrate, requiring sufficient hardness and compressive strength. Shore D hardness of 80-85 is a reliable industry standard.
Good wetting ability: Carbon fiber has a smooth, chemically inert surface. The adhesive must fully wet each fiber to achieve the full strength of the carbon fiber. Low-viscosity curing agents improve wetting.
Color differentiation: Carbon fabric adhesive often needs to be distinguished from primers or repair materials. A characteristic color such as amber helps workers identify the product.
Substrate adhesion: Different substrates such as concrete, steel, and masonry have varying adhesion requirements. The curing agent must provide good bonding performance.
Highfar HF-J3-2S is a modified amine epoxy curing agent specifically designed for carbon fabric bonding and building structure reinforcement.
HF-J3-2S is an amber transparent liquid, making it easy to identify during application. Viscosity at 25°C is 1100-1600 mPa·s, providing good wetting and workability when mixed with epoxy resin. Amine value is 280-380 mg KOH/g, with an active hydrogen equivalent weight of 97 g/eq. When used with liquid epoxy resin (EEW 190), the recommended dosage is 50 phr. Gel time at 25°C (100g mixed mass) is 35-45 minutes, offering adequate working time for on-site application. Cured Shore D hardness reaches 80-85, and a 0.2mm thin film dries to the touch within 24 hours at room temperature, meeting the rapid turnaround requirements of building reinforcement projects.
Carbon fabric bonding: Bonding carbon fiber fabric to concrete beams, slabs, columns, and shear walls to increase flexural and shear capacity. Suitable for reinforcement of bridges, factories, warehouses, parking garages, and other structures.
Building structure reinforcement: Includes floor load-bearing upgrades, beam and column section enlargement, wall opening reinforcement, seismic retrofitting, and crack repair. For structures requiring reinforcement due to design changes, functional adjustments, or construction defects, HF-J3-2S provides reliable bonding.
Concrete and steel bonding: HF-J3-2S offers good adhesion to concrete, steel, masonry, and other substrates, making it suitable for bonding dissimilar materials.
Precast component assembly: In prefabricated construction, HF-J3-2S meets the requirements for filling and bonding joints between precast concrete components with its high hardness and fast curing characteristics.
Other composite applications: Includes glass fabric bonding, carbon fiber plate bonding, aramid fabric bonding, and similar applications.
Carbon fiber reinforcement has become the mainstream method for building structure renovation and repair. As a key component of carbon fabric adhesive, the performance of epoxy curing agents directly determines the reliability and durability of the reinforcement. Highfar HF-J3-2S provides stable performance for carbon fabric bonding and building reinforcement with its optimized formulation.
For samples or technical support, please contact the Highfar team.
Highfar National Service Hotline
