For potting Hall current sensors, should you choose polyurethane or epoxy adhesive?
When selecting encapsulating adhesive for Hall‑effect current sensors, several factors must be considered, including the adhesive’s bond strength, high‑temperature resistance, corrosion resistance, ease of application, and the physical properties of the cured material.
Shanghai Hinnel
2026/06/16
I. Characteristics of Polyurethane Potting Compound:
Polyurethane potting compounds are better suited for applications that demand high elasticity, impact resistance, and excellent performance under temperature fluctuations.
Core Advantages : After curing, polyurethane potting compounds exhibit excellent elasticity, effectively mitigating mechanical stresses caused by temperature variations and safeguarding sensor measurement accuracy. Their low viscosity and outstanding self‑degassing properties facilitate penetration into minute gaps. They also demonstrate superior resistance to damp heat and thermal shock, and can pass dual… 85 Tested to withstand humid and vibration‑prone environments; its hardness can be finely tuned, and it exhibits excellent flame retardancy and thermal conductivity.
Main drawbacks : The standard type has lower high-temperature resistance than the high-temperature epoxy adhesive, and ordinary polyurethane is not resistant to… 200℃ The above-mentioned high temperatures result in poor weather resistance and make the material susceptible to UV exposure.
II. Characteristics of Epoxy Potting Compound:
Epoxy adhesives are better suited for applications that demand high hardness, excellent electrical insulation, and superior high-temperature resistance:
Core Advantages Epoxy potting compounds offer superior bonding strength, high hardness after curing, and the ability to withstand mechanical and thermal stresses in high-temperature environments. They exhibit excellent corrosion resistance, protecting sensors from corrosive damage, and provide outstanding electrical insulation and waterproofing, securely anchoring internal electronic components while preventing vibration‑induced loosening. High‑temperature‑resistant epoxy adhesives can meet… 200℃ For use in high-temperature environments.
Main drawbacks : After curing, the material exhibits a relatively brittle texture and poor stress‑relief capability under thermal cycling; it also requires a longer curing time, resulting in a correspondingly extended processing cycle, and its high‑temperature resistance is generally moderate.
When selecting an adhesive, ease of application and cost-effectiveness should also be taken into account. Both polyurethane potting compounds and epoxy potting compounds offer excellent workability, making them easy to mix and apply. Meanwhile, as manufacturing technologies advance and market competition intensifies, the costs of both adhesives continue to decline, making them highly cost-effective options.
Recommendations for Selecting Hall Current Sensors:
- If the Hall current sensor is operating In 200℃ High-temperature environments, or applications with stringent requirements for insulation hardness. ， Prioritize high-temperature-resistant epoxy potting compounds.
- If the sensor is functioning In Humid and vibration-prone environment, with frequent temperature fluctuations. , prioritize polyurethane potting compounds, It can better safeguard measurement accuracy and prevent stress-induced deformation.
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For potting Hall current sensors, should you choose polyurethane or epoxy adhesive?
Shanghai Hinnel
2026/06/16
Shanghai Hinnel
2026/06/09
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