Solenoid valve coils are susceptible to degradation from temperature and humidity, and improper operating conditions can lead to moisture‑induced short circuits or thermal aging and burnout, directly causing equipment failure. The valve spool, with extremely tight fit tolerances, is prone to sticking due to residual contaminants in the working medium, inadequate lubrication, or excessive viscosity, resulting in impaired opening and closing performance. After prolonged high‑frequency operation, seals tend to age and wear, leading to air leaks and cross‑flow; this not only reduces system pressure but also compromises the precision of media control. In environments characterized by high humidity, significant temperature fluctuations, vibration, or corrosive media, component degradation accelerates markedly, further limiting overall environmental adaptability. Moreover, conventional solenoid valves support only two discrete on/off states, failing to meet the demands of high‑precision continuous regulation, and they impose stringent requirements on fluid viscosity and cleanliness, thereby restricting their applicability.

So, what characteristics should an encapsulating potting compound possess when selecting one for solenoid valves?

1 ) Excellent fluidity: Encapsulating adhesives used in applications must have low viscosity to readily penetrate every corner inside the solenoid valve, ensuring complete encapsulation.

2 ) Fast curing speed: Under appropriate conditions, potting compounds can cure rapidly, shortening the production cycle and enhancing manufacturing efficiency.

3 ) No shrinkage after curing: The potting adhesive exhibits no shrinkage during curing, ensuring a tight bond between the encapsulant and the internal structure of the solenoid valve, thereby preventing the ingress of water and moisture.

4 ) Excellent electrical performance: Encapsulating potting compounds must exhibit excellent insulating and voltage‑withstand properties to effectively ensure the electrical safety of solenoid valves.

5 ) Good weather resistance: Potting compounds must exhibit excellent weather resistance, maintaining stable performance across diverse climatic conditions and enduring a wide range of harsh environments.

6 ) Environmentally friendly and non-toxic: The potting compound is formulated with environmentally friendly raw materials, is non‑toxic and odorless, and poses no harm to humans or the environment.

Solution: HN6225 Two-component flame-retardant epoxy potting compound.

HN6225 Epoxy potting compound, Room-temperature or heat-curable adhesives with low mixed viscosity, excellent air‑release properties, and resistance to damp heat, high and low temperatures, and thermal shock (available upon request). 5:1 or 4:1 Formulation. Suitable for potting and encapsulating small electronic components such as solenoid valves, capacitors, transformers, automotive electronics, and sensors.

1. The construction process is compatible with electromagnetic valve potting, resulting in high processing efficiency.

HN6225 It features low viscosity and excellent flow‑infiltration properties, with inherent self‑degassing capabilities. During potting, it fully fills the gaps in solenoid valve coils and the fine spaces between windings, eliminating bubble‑induced voids. Environmentally friendly—solvent‑free, non‑toxic, and odorless—it cures without releasing small‑molecule byproducts, thereby preventing corrosion of the internal copper windings, iron core, and plastic components of the solenoid valve. It is compatible with automated, high‑volume potting lines.

II. The cured product exhibits dimensional stability and ensures electrical safety, making it suitable for solenoid valve operating conditions.

It exhibits extremely low curing shrinkage and, when paired with a high-toughness curing system, effectively prevents cracking and debonding of the encapsulant layer within the valve body caused by temperature fluctuations. HN6225 After molding, the surface is glossy and exhibits a high flame-retardant rating along with excellent insulation properties, effectively preventing leakage current and short-circuit risks in solenoid coil windings, suppressing arc formation, and significantly enhancing the safety of solenoid operation under power.

3. Excellent weather-resistant bonding performance, extending the service life of solenoid valves.

The cured material exhibits exceptional mechanical strength and heat resistance, enduring repeated high–low temperature cycling and adapting to the thermal‑fluctuating conditions of solenoid valves subjected to prolonged energization and intermittent on/off operation. It demonstrates excellent adhesion to the valve’s metal core, housing, and engineering‑plastic coil bobbin, preventing delamination under alternating thermal stress. Moreover, it effectively seals out moisture and dust, protecting the internal valve‑core assembly, thereby ensuring stable long‑term performance and reducing the likelihood of leaks and valve‑sticking failures.

Common issues with potting compounds:

Q: Why choose Hinnel for the solenoid valve? HN6225 Epoxy potting compound?

A: Hinnel epoxy potting compound can specifically address the core pain points of solenoid valves, offering advantages such as insulation and moisture resistance to prevent coil failure, high bonding strength to enhance vibration resistance, and broad temperature tolerance and resistance to thermal shock, making it suitable for various types of solenoid valves. Its overall performance and cost-effectiveness surpass those of silicone and polyurethane potting compounds.

Q: What are the key considerations when potting solenoid valves?

A: When potting the solenoid valve, control the amount of adhesive to prevent overflow that could jam the valve; select an adhesive compatible with the valve body material, and regularly inspect the seals, replacing any aged sealants or sealing components.

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