Solar Silicone Sealant for PV Panels & Solar Applications
Silicone sealing solutions for suitable photovoltaic module, solar frame, junction box, cable-entry and outdoor solar equipment applications.
Redisil silicone sealants can help provide flexible environmental sealing where solar assemblies are exposed to moisture, UV radiation, temperature variation and outdoor conditions.
Silicone Sealing Solutions for Solar Energy
Photovoltaic modules and solar equipment operate continuously in outdoor environments. Solar assemblies may experience sunlight, rain, humidity, dust, temperature cycling, vibration and thermal movement throughout their service life.
Silicone sealants are used in suitable solar applications to seal joints and interfaces while maintaining flexibility under environmental and mechanical movement.
Redisil provides silicone sealing options for selected solar applications, while the wider Fasto portfolio provides specialized products for solar frame sealing, junction-box potting and related electrical protection requirements.
What Challenges Do Solar Assemblies Face?
Where Are Silicone Sealants Used in Solar Applications?
Different parts of a solar assembly may require different sealing or protection technologies. The correct product depends on the application, substrates and operating conditions.
Solar Panel Frame Sealing
Sealing suitable interfaces between aluminium frames, glass and other compatible module components.
- Frame-to-glass interfaces
- Module perimeter sealing
- Frame joints
- Outdoor environmental sealing
PV Module Assembly
Silicone sealants can be evaluated for suitable module assembly interfaces requiring flexible environmental protection.
- Panel assembly interfaces
- Edge sealing
- Component interfaces
- Outdoor protection
Junction Box Sealing
Junction-box applications may require both external sealing and internal encapsulation depending on the assembly design.
- Junction-box bonding
- External sealing
- Cable-entry protection
- Electrical component protection
Cable Entry & Connector Sealing
Suitable silicone sealants can help protect cable entry points and component interfaces against moisture, dust and outdoor exposure.
- Cable entry points
- Connector interfaces
- Cable glands
- Outdoor electrical interfaces
Solar Inverters & Power Electronics
Solar inverter and power-electronics assemblies may require sealing, encapsulation and environmental protection for sensitive electronic components.
- Electrical enclosures
- PCB protection
- Component sealing
- Environmental protection
Rooftop Solar Installations
Outdoor rooftop systems require suitable sealing solutions for exposed components, mounting interfaces and cable-entry areas.
- Weather sealing
- Cable interfaces
- Outdoor equipment
- Mounting-related interfaces
Solar Sealant vs. Solar Potting Compound
Sealing and potting are different functions. Selecting the correct material for the actual application is important for reliable solar assembly performance.
Redisil Silicone Sealants for Solar Applications
Select the product according to the application, substrate, outdoor exposure, joint movement and required performance.
Redisil NP Pro
One-part, neutral-cure RTV silicone sealant for selected solar panel, assembly and environmental sealing applications.
- Neutral cure
- Non-corrosive formulation
- Flexible sealing
- Weather and UV exposure resistance
- Suitable for selected substrates
Redisil 789 Pro
Weather-grade neutral-cure RTV silicone sealant for suitable outdoor applications exposed to UV, humidity and temperature variation.
- Neutral cure
- UV and weather resistance
- High flexibility
- Outdoor applications
- Wide substrate compatibility
Fasto SM30
Solar frame sealant and RTV silicone technology intended for suitable solar frame and module sealing applications.
- Solar frame sealing
- RTV silicone technology
- Outdoor application focus
- Flexible sealing
- Solar module applications
Fasto SP70
Two-part, PV-grade silicone potting and encapsulation compound for suitable solar junction-box and electronic protection applications.
- Two-part neutral-cure system
- Low viscosity
- Self-leveling
- Electrical insulation
- UV and moisture resistance
Fasto S887
Neutral-cure RTV silicone technology that can be evaluated for selected solar inverter and power-electronics sealing requirements.
- Neutral-cure silicone
- Electrical protection applications
- Flexible sealing
- Suitable for selected electronics
- Environmental protection
Fasto Solar Silicone Solutions
Explore the wider Fasto portfolio for solar frame sealing, junction-box potting, electrical protection and related solar adhesive and sealant requirements.
- Solar frame sealing
- Junction-box potting
- Electrical protection
- Outdoor sealing
- Solar manufacturing applications
Solar Silicone Sealant Selection Guide
| Solar Application | Product Direction | Primary Requirement |
|---|---|---|
| PV panel & assembly sealing | Redisil NP Pro | Flexible environmental sealing |
| Outdoor solar sealing | Redisil 789 Pro | UV, weather and humidity exposure |
| Solar frame sealing | Fasto SM30 | Solar frame and module sealing |
| Junction box potting | Fasto SP70 | Component encapsulation and protection |
| Solar inverter / power electronics | Fasto S887 | Selected electrical and environmental sealing |
| Rooftop solar sealing | Redisil NP Pro / Redisil 789 Pro / Fasto SM30 | Outdoor weather and moisture protection |
Product selection should be validated against the actual substrate, joint design, operating environment and required performance before production use.
Where Silicone Materials Fit into Solar Manufacturing
Solar manufacturing involves several different sealing, bonding and protection requirements. The material should be selected according to the function it performs.
Module Assembly
Suitable sealing and bonding around module interfaces.
Frame Sealing
Weather-resistant sealing around suitable frame interfaces.
Junction Box
Bonding, sealing and/or encapsulation according to the assembly design.
Cable Interfaces
Protection of suitable cable entry and connector interfaces.
Outdoor Service
Long-term exposure to UV, moisture, temperature variation and weather.
How to Select the Right Solar Silicone Sealant
Solar application alone is not enough to select a sealant. Consider the complete assembly and operating environment.
Glass, aluminium, steel, plastic, rubber or composite materials.
Determine the level and duration of outdoor sunlight exposure.
Consider rain, humidity, condensation and possible water ingress.
Evaluate minimum, maximum and continuous operating temperatures.
Consider expansion and contraction between different materials.
Determine whether insulation or electronic protection is required.
Consider manual, pneumatic or automated dispensing requirements.
Determine whether the application requires a surface seal or complete component encapsulation.
How to Apply Silicone Sealant in Solar Applications
Prepare
Clean and dry the surfaces and remove dust, grease, oil and contaminants.
Check
Verify substrate compatibility and determine whether primer or other preparation is required.
Dispense
Apply a continuous and uniform bead using suitable dispensing equipment.
Tool
Tool the sealant before skin formation to obtain proper substrate contact.
Cure
Allow curing according to the relevant product Technical Data Sheet and environmental conditions.
Explore Complete Solar Adhesive & Sealant Solutions
Solar manufacturing can require more than silicone sealants. Fasto provides additional technologies for frame sealing, junction-box potting, electrical protection and other solar applications.
Fasto Adhesives – Solar Energy Solutions
Explore application-specific solutions for solar module manufacturing, PV sealing, junction-box protection, inverter electronics and solar installation.
Explore Fasto Solar Energy →Fasto Silicone Compounds
Explore the complete silicone portfolio including solar sealants, industrial RTV sealants, silicone potting compounds and other silicone technologies.
View Silicone Compounds →Frequently Asked Questions About Solar Silicone Sealants
What is solar silicone sealant?
Solar silicone sealant is a silicone-based sealing material used for suitable photovoltaic module, frame, electrical and outdoor solar applications. The appropriate product depends on the substrate, environment and required performance.
What is silicone sealant used for in solar panels?
Silicone sealants can be used for suitable frame sealing, module interfaces, cable-entry areas, electrical enclosures and other outdoor component sealing applications.
Which Redisil product can be used for solar applications?
Redisil NP Pro can be evaluated for selected solar panel and assembly sealing applications. Redisil 789 Pro is a weather-grade neutral-cure option for suitable outdoor applications. Final product selection should be based on the actual application.
What is used for solar frame sealing?
Solar frame sealing requires a product compatible with the frame, glass and joint design. Fasto SM30 is positioned within the Fasto portfolio as a solar frame sealant and RTV silicone solution.
What is used for solar junction box potting?
A dedicated silicone potting compound should be considered when complete encapsulation is required. Fasto SP70 is a two-part PV-grade silicone potting and encapsulation compound for suitable solar junction-box applications.
What is the difference between solar sealant and potting compound?
A sealant is generally applied to joints and interfaces, while a potting compound fills and encapsulates suitable components or cavities. They should not automatically be treated as interchangeable materials.
Can silicone sealants withstand outdoor solar exposure?
Selected silicone sealants are designed for outdoor and weather-exposed applications. UV, temperature, moisture and substrate performance should always be verified against the relevant product Technical Data Sheet.
How do I select a silicone sealant for a PV module?
Evaluate the substrate, joint design, UV exposure, moisture, temperature cycling, movement, electrical requirements, dispensing method and required service performance.
Are silicone sealants suitable for solar inverter applications?
Selected silicone sealing and potting technologies can be used for suitable inverter and power-electronics applications. The exact material should be selected according to the electronic assembly and environmental requirements.
Does Redisil provide solar silicone sealing solutions?
Yes. Redisil provides silicone sealant options for selected solar sealing applications, while the wider Fasto portfolio provides specialized solar technologies including frame sealants and silicone potting compounds.
Looking for the Right Solar Silicone Solution?
Tell us about your solar application, substrate, joint design, environmental conditions and production process. Our team can help identify a suitable sealing or protection technology.
Explore Solar SolutionsProduct suitability depends on the specific application, substrates, operating conditions and required performance. Always review the latest Technical Data Sheet and validate the selected product under actual application conditions before production use.
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