Choosing the right potting compound is crucial for rain gauges. Key performance requirements include: 

Electrical Insulation: The potting compound must provide excellent electrical insulation to prevent current leakage, protect the sensor from electromagnetic interference, and ensure accurate and safe data transmission. 

Flexibility and Moderate Hardness: Rain gauges usually contain sensitive electronic components; therefore, the potting compound should not be too hard to avoid stressing or damaging the components. Excessive hardness can damage sensor components or cause the encapsulating layer to crack. A hardness of less than 60D is more suitable, balancing mechanical protection with component safety. 

Low Mixed Viscosity: The potting compound should have a low mixed viscosity to ensure even coverage of the internal sensor structure during potting, protecting every detail. Low viscosity also improves production efficiency and reduces operational difficulty. 

Water and Moisture Resistance: Since rain gauges are often exposed outdoors to rain, dew, and other humid environments, the potting compound must have excellent water and moisture resistance to prevent water from entering and damaging electronic components. 

Bond Strength: The potting compound must have good adhesion to the sensor substrate (such as metal, plastic, or ceramic) to form a strong bond, preventing sealing failure or reduced mechanical strength due to poor adhesion, thus preventing delamination of the encapsulating material during use. 

Environmental Friendliness: With increasing environmental awareness, the potting compound must meet environmental standards, with low volatile organic compound (VOC) emissions to minimize environmental impact, especially for sensors used outdoors for extended periods.

Recommended Product: HNGel5270 Organosilicon Gel 

Hinnel organosilicon gel has excellent fluidity, very good self-defoaming properties, and processability. It can be used for a long time in the temperature range of -65～200℃. It has excellent electrical properties and chemical stability and is physiologically inert. Used for waterproof sealing of instruments and meters, junction boxes; waterproof sealing of automotive electronics and sensors; transparent potting of solar energy and photovoltaic equipment. 

HNGel5270 Organosilicon Gel Characteristics: 

· Colorless and transparent, resistant to yellowing, easy to repair 

· Soft colloid, high strength and elongation 

· Excellent waterproof sealing performance 

· The colloid is not easy to break when frequently damaged, and the colloid can be separated by double-sided bonding 

· A variety of hardness and curing time products are available 

HNGel5270 Organosilicon Gel With its excellent waterproof performance, moderate hardness, low mixed viscosity, good adhesion, and long-term stability after curing, it is an ideal choice for potting rain gauges. It effectively protects internal sensor components, ensuring stable operation even in harsh weather conditions, providing reliable technical support for meteorological monitoring, agricultural irrigation, smart city construction, and other fields. We hope this introduction is helpful. If you have any further questions, please feel free to contact us!

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