Transparent Potting Adhesive: Application in Lamp Potting Scenarios
2025/12/03
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Transparent potting adhesive is a widely used material in lamp potting scenarios. Its core advantage lies in combining excellent protective performance with optical transparency, which can meet the dual requirements of lamps for sealing, weather resistance, and light transmittance. The following is a detailed analysis from the aspects of adaptability, core characteristics, applicable scenarios, and selection key points:
1. Core Reasons for Transparent Potting Adhesive Adapting to Lamp Potting
Transparent Potting Adhesive: Application in Lamp Potting Scenarios
Optical Compatibility
High-quality transparent potting adhesive can achieve a light transmittance of more than 90% (in the visible light band) and has a low yellowing index. It will not block the light output efficiency of the lamp’s light source, making it suitable for LED lamps, optical lamps, and other types that require light transmittance. At the same time, it can fill the gaps inside the lamp, reduce light refraction/scattering losses, and improve light utilization efficiency.
Protective Performance
- Waterproof and Moisture-proof: It can reach IP67/IP68 protection levels, isolating external moisture and dust from entering the lamp cavity, and preventing short circuits or oxidation of circuit boards and light source modules.
- Temperature and Weather Resistance: It can adapt to temperature changes during lamp operation (a common tolerance range of -40℃ to 150℃), resist ultraviolet rays and high-low temperature cycle aging, and is suitable for complex working conditions such as outdoor lamps (street lamps, garden lamps) and vehicle-mounted lamps.
- Shock Absorption and Buffering: After curing, the adhesive has elasticity or toughness, which can absorb shock impacts during transportation and use, and protect the precision components inside the lamp.
Process Adaptability
It has good fluidity and can be fully potted into complex lamp cavities (such as the gap between the lens and the base, and the periphery of the circuit board). It has flexible curing methods (room temperature curing or heat curing can be selected), which is suitable for automated/manual potting processes in mass production. Moreover, there is no obvious shrinkage after curing, avoiding structural deformation of the lamp.
2. Types and Characteristics of Transparent Potting Adhesives Commonly Used in Lamp Potting
| Adhesive Type | Core Characteristics | Applicable Lamp Scenarios | Limitations |
|---|---|---|---|
| Silicone Potting Adhesive | Excellent temperature resistance (-60℃ to 200℃), strong weather resistance, good elasticity, and moderate adhesion to substrates | Outdoor LED lamps, vehicle-mounted lamps, high-temperature lamps | Low mechanical strength and general chemical resistance |
| Epoxy Resin Potting Adhesive | High hardness, excellent bonding strength, good insulation, and low cost | Indoor lamps, small LED modules, decorative lamps | Slightly poor temperature resistance, easy to be brittle at low temperatures, and higher yellowing risk than silicone |
| Polyurethane Potting Adhesive | Good flexibility, strong impact resistance, and excellent adhesion | Portable lamps, waterproof light strips, landscape lamps | Poor UV resistance, easy to age when used outdoors for a long time |
3. Key Points for Selecting Transparent Potting Adhesive for Lamp Potting
- Light Transmittance and Yellowing Resistance: Priority should be given to products with a yellowing index (ΔYI) < 3 (after 1000h UV aging test) to ensure no obvious light transmittance attenuation during long-term use of the lamp.
- Temperature Resistance Matching: According to the lamp’s working temperature rise (for example, the core temperature of high-power LED lamps can reach above 120℃), select an adhesive type whose upper temperature resistance limit is more than 20℃ higher than the actual working temperature.
- Environmental Protection and Safety: It should comply with environmental standards such as RoHS and REACH. Especially for indoor lamps, it is necessary to avoid excessive volatile organic compounds (VOC).
- Process Adaptability: For automated production lines, two-component adhesives with low viscosity (500-1000 mPa・s) and machine-mixable properties are preferred; for manual potting, adhesives that can be cured at room temperature and have an operation time of more than 30 minutes can be selected.
4. Application Precautions
- Before potting, the surface of the lamp cavity must be cleaned (to remove oil stains and dust), otherwise the adhesion and sealing performance of the adhesive will be affected.
- Control the potting amount to avoid adhesive overflow polluting the lamp’s appearance, and at the same time reserve a small amount of expansion space (especially for heat-curing adhesives).
- For outdoor lamps, it is recommended to use them with sealing rubber rings. The combination of potting adhesive and sealing rings provides double protection and improves waterproof reliability.
Dongguan Yusheng Technology focuses on the design and R&D of transparent potting and waterproofing for lamps, and can provide waterproof solutions for various scenarios.
