Do Sealants Play To Protect Your Solar Panels​​

On the solar front, panels contend each day with sun, heat, cold and water. As everyone focuses on the solar cells themselves, the sealant that holds it all together is just as crucial for long-term performance.

There are three primary types of sealants that safeguard the panels of photovoltaic systems:

Excellent high-temperature resistance

Prone to gradual UV degradation

Common in older panel designs

Superior moisture blocking

Limited flexibility in cold climates

Often used in laminate edges

Perfect balance between flexibility and strength

Remains flexible, won”t become brittle -40 to 120 degrees Celsius

30x better UV resistance than silicones

Preferred for frameless bifacial panels

There are now more sophisticated polyurethanes that specifically target the solar problems:

​​Thermal Stress Relief​​: Provides a flex feature to expand/contract with panel materials

​​Weather resistant​​: Successful laboratory testing shows 100% mm water absorption in 5,000 hours

Electrical Safeguard: Patented cell connectors are protected from moisture and corrosion to promote longer battery life

​​Choosing Quality Sealants​​

Look for these certifications:

IEC 61215 (Thermal Cycling Test)

UL 746C (Long-Term UV Exposure)

ISO 10993 (Material Safety)

Independent testing indicates that, for premium polyurethane sealants, this increase in service can be 5-8 years more than that of basic sealants.

Examine Sealant Every Few Years:

Cracking or peeling at edges

Discoloration from UV damage

Moisture accumulation under laminates

​​For Industrial and Residential Applications:​​

High-Performance Polyurethane Sealants for Professionals Pros can look to Joobond’s solar-grade sealant formulations, which marry military-grade weather-resistance with solar-specific electrical-safety features. They have a technical team that provides free compatibility testing for new panel designs.