As electronic components continue to advance toward miniaturization and weight reduction while simultaneously demanding higher electrical and mechanical performance, the requirements for encapsulating materials in terms of chemical, thermal, and physical properties have become increasingly stringent. Against this backdrop, single-component, solvent-free, low-temperature fast-curing epoxy resins are emerging as a key material direction in electronics manufacturing. ThreeBond 2212B is a heat-curable, one-component epoxy compound developed precisely to meet these demands, specifically designed for precision bonding, sealing, and potting applications in the electrical and electronics field.
ThreeBond 2212B is a black paste-like single-component system with a viscosity of 25 Pa·s at 25°C and a density of 1.39 g/cm³, suitable for filling micro-gaps and potting precision structures. The product requires no weighing, mixing, or stirring — it is ready to use straight from the container and can be directly integrated into automated dispensing systems, eliminating the mixing errors and process interruptions commonly associated with two-component systems.
In terms of curing performance, ThreeBond 2212B demonstrates significant low-temperature fast-curing advantages. The product achieves full cure at 80°C in 30 minutes, reduced to 20 minutes at 100°C and just 10 minutes at 120°C, while a rapid cure of only 1 minute can be achieved at 150°C. This flexible curing window allows it to accommodate both low-temperature process requirements for heat-sensitive components and the short cycle times demanded by high-speed production lines.
After curing, ThreeBond 2212B has a non-volatile content exceeding 99% with minimal shrinkage, effectively reducing internal stress at the bonding interface and preventing deformation and cracking of precision components. Its tensile shear strength reaches 10.2 MPa, maintaining a stable 8.8 MPa shear strength across the 25°C to 120°C temperature range, and still retaining 2.0 MPa at 200°C. The glass transition temperature is 130°C, volume resistivity reaches 1.6*10¹⁴ Ω·m, dielectric constant at 1 MHz is 3.4, dissipation factor at 1 MHz is 0.020, dielectric breakdown strength is 23 MV/m, and arc resistance reaches 140 seconds. These electrical performance metrics enable the product to provide reliable insulation protection and stable signal transmission for precision electronic components over the long term.
In practical applications, ThreeBond 2212B is widely suitable for relay sealing, sensor component bonding and fixing, impregnation and fixing of small motor coils, temporary chip fixing, and potting protection of various small electronic components. Its low-stress characteristics effectively prevent deformation of internal sensor structures, ensuring long-term stability of measurement accuracy. In relay sealing applications, the product forms a dense sealing layer through low-temperature fast curing, effectively isolating dust, moisture, and chemical erosion, meeting the demands of long-term use in harsh environments such as high temperature and high humidity. The product provides strong adhesion to a variety of substrates including metals, ceramics, glass, PCBs, and plastics, meeting the bonding and sealing needs of components with different materials in electronic equipment.
ThreeBond 2212B covers three major market segments: automotive, electronics, and public industrial materials. In the automotive market, the product can be used for bonding and sealing in vehicle powertrains, electrical components, construction machinery, and marine vessels. In the electronics market, it is widely used for bonding and sealing small electronic components in electrical appliances such as mobile phones and computers. In the public industrial materials market, it is suitable for infrastructure, construction, and general machinery applications.
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