How do you choose the right potting compound for a solar junction box?
Solar junction boxes are exposed outdoors for long periods and must withstand harsh conditions such as intense high-temperature exposure, freezing temperatures, ultraviolet radiation, and rainwater erosion. Moreover, they must ensure reliable electrical insulation and stable heat dissipation. Therefore, the encapsulating adhesive used must meet the following performance requirements:
Shanghai Hinnel
2026/01/13
1. Weather resistance: Choosing a potting compound with excellent weather resistance can ensure that the solar junction box maintains stable operation under various climatic conditions.
2. Bonding performance: Ensure that the potting compound has strong adhesion to effectively secure the solar junction box and prevent loosening.
3. Environmental friendliness: Choose potting compounds that meet environmental protection requirements to reduce their impact on the environment.
There are three common types of potting compounds: epoxy resin potting compounds, polyurethane potting compounds, and silicone potting compounds. Each has its own unique advantages. For example, epoxy resins are widely used due to their excellent insulation properties, strong adhesion, and good temperature resistance. Polyurethanes are renowned for their ability to withstand low temperatures and their superior waterproof and moisture-proof performance, though their high-temperature resistance is relatively limited. Silicone, with its outstanding resistance to both high and low temperatures, weathering, electrical insulation, and shock-absorbing capabilities, has become the mainstream choice in the solar junction box industry.
Recommended for use Hinnel 5：1 Thermally Conductive Flame-Retardant Condensation-Type Silicone Potting Compound
· Excellent weather resistance, anti- UV Strong ability to withstand alternating high and low temperatures
· Good flexibility, doesn't tear when expanding or contracting with temperature changes.
· Thermal conductivity is adjustable, and insulation performance is excellent.
· Can be reworked (strippable) after curing.
· Waterproof and flame-retardant, with excellent adhesion.
Precautions for using potting compounds:
1. Clean the surface: Ensure that the mounting surface of the solar junction box is clean, free of oil stains and impurities, to enhance the adhesion of the potting compound.
2. Evenly apply: Apply the potting compound evenly onto the mounting surface of the solar junction box, ensuring that no air bubbles or voids are left behind.
3. Appropriate pressure: When potting the solar junction box, apply appropriate pressure to ensure that the adhesive fully bonds and any air bubbles are expelled.
In short, Encapsulating photovoltaic junction boxes It is an important component that affects the normal operation of the entire solar power generation system. Therefore, when selecting potting compounds, you must choose high-quality silicone potting compounds and follow the potting standards strictly to achieve the desired results.
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2026/01/22
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