Can an electric bicycle controller be encapsulated using polyurethane potting compound?
As the core component of an electric vehicle, the controller’s sealing performance directly affects the overall reliability of the vehicle. Therefore, to safeguard the controller and its internal electronic components, a high‑performance potting compound is required to provide effective sealing protection.
Shanghai Hinnel
Jul 20,2026
In practical applications, drive controllers must contend with a range of challenges. First, electric bicycles operating on varying road surfaces are subject to vibrations and impacts, which can compromise the reliability of internal electronic components. Second, high humidity and temperature fluctuations may lead to circuit shorting or increased insulation losses, potentially resulting in component failure. Furthermore, external contaminants such as dust and oil can infiltrate electronic devices, causing damage to their internal parts. Consequently, selecting an appropriate potting material can significantly extend the controller’s service life.
Polyurethane potting compound, a sealant specially formulated to provide long-term protection for precision circuit controllers and electronic components in the electronics industry. It boasts exceptional water- and dust-proof performance, effectively preventing the ingress of moisture, dust, and particulates, thereby ensuring stable operation of the controller even under harsh environmental conditions and reducing the likelihood of failures. Additionally, it offers excellent electrical insulation, effectively mitigating the risks of short circuits and electric shock, providing reliable protection for riding applications.
Polyurethane potting compound is easy to apply, cures quickly, and helps boost production efficiency. Moreover, it meets environmental standards, is non‑toxic and odorless, and is environmentally friendly.
Specific model recommendations: Hinnel PU512 Polyurethane potting compound
HNPU512 It is a two-component polyurethane sealant that cures at room temperature or with heat. After mixing, it exhibits excellent processability, a long working life, and a moderate cure rate. The cured product features a glossy, smooth surface, high adhesive strength, superior toughness, and outstanding flame retardancy and electrical insulation properties, making it well suited for potting electronic components—such as electric‑bike controllers, automotive electronics, filters, and capacitors—that operate in humid, vibration‑prone environments.
Features and Advantages
- Low mixed viscosity, with excellent fluidity and permeability.
- The cured product exhibits excellent electrical properties as well as water- and moisture-resistant characteristics.
- Excellent low-temperature performance, flame retardancy, and thermal conductivity.
- It exhibits high colloidal strength, excellent toughness, and strong adhesion to metals, plastics, wire harnesses, and other materials.
- High-temperature and high-humidity resistant, (at a relative humidity of 85% , temperature 85 Under conditions of ℃, after 1000 (1-hour damp-heat test)
- Resistance to thermal shock and thermal cycling ( -45~125℃ )
In summary, to ensure the reliability of electric bicycle drive controllers, implementing effective protective measures is essential. Polyurethane potting compounds, with their outstanding protective performance, electrical insulation, thermal stability, and environmental friendliness, are an ideal choice for electric bicycle drive controllers, significantly enhancing the vehicle’s overall stability.
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