(July 31, 2026)The scale of photovoltaic installations keeps rising, bringing demand expansion opportunities for hydrophobic fumed silica dedicated to photovoltaic sealants. With technological iteration of global photovoltaic modules, new-generation cells such as TOPCon and HJT are being widely adopted. Outdoor photovoltaic modules face increasingly strict requirements for weather resistance, UV resistance and anti-yellowing performance of encapsulated silicone sealants. As the core reinforcing and thixotropic filler, modified fumed silica for photovoltaic adhesives directly determines the long-term outdoor service life of sealants. The new energy photovoltaic sector continuously fuels incremental demand for high-end functional silica.
For a long time, ordinary grades of silica feature unstable surface functional groups. Incorporation into photovoltaic silicone adhesive systems tends to trigger powder agglomeration and drastic viscosity fluctuation of finished adhesives during storage. Long-term outdoor exposure easily causes adhesive yellowing and attenuation of bonding strength, failing to meet the 25-year service standard for photovoltaic modules. Photovoltaic-grade silica with precise hydrophobic modification and low-volatility treatment boasts uniform particle size distribution and excellent dispersibility in silicone polymers. It can form a stable three-dimensional network structure, effectively improving the tensile strength and crack resistance of sealants, optimizing thixotropy to avoid sagging during construction, and inhibiting adhesive yellowing. It is suitable for multiple scenarios including module frame sealants, junction box potting adhesives and photovoltaic backsheet coatings.
In the second half of 2026, new domestic and overseas photovoltaic projects start construction intensively. Distributed photovoltaic and energy storage integrated projects continue to expand, while export orders for modules grow steadily. Multiple European and American countries have updated environmental standards for photovoltaic components with strict control over low-molecular volatiles, pushing sealant manufacturers to upgrade raw material systems. Leading domestic silica enterprises keep optimizing fumed synthesis and surface modification processes, and develop special grades with low extractables and outstanding weather resistance. Many powder enterprises carry out joint formula testing with silicone sealant research institutes, and develop customized filler solutions for ultra-thin module sealing and double-glass module encapsulation.
Photovoltaic encapsulation scenarios impose differentiated indicator requirements on silica. Frame sealants for modules prioritize UV resistance and anti-yellowing performance; junction box potting adhesives require ultra-low volatile content to prevent corrosion of electronic components; outdoor backsheet coatings for energy storage photovoltaic products balance wear resistance and resistance to high-low temperature cycles. A single universal grade cannot adapt to diversified silicone adhesive formulas, driving powder manufacturers to build graded product portfolios. Leading photovoltaic adhesive companies implement lengthy raw material certification cycles, continuously lifting technical entry barriers for this track.
The track sees continuously unleashed growth potential, yet industrial challenges cannot be ignored. Photovoltaic-grade fumed silica enforces strict standards for modification uniformity and impurity control, calling for heavy investment in production line technologies. Overseas high-end powder has long occupied supply chains of top photovoltaic adhesive producers. Numerous small and medium-sized powder manufacturers lack long-term outdoor weathering test data and suffer unstable batch performance, making it hard to enter formal photovoltaic industrial chains. Low-cost non-standard powder on the market may trigger mass failure of modules and damage the overall reputation of domestic powder products.
Differentiation within the industry keeps intensifying. Leading enterprises mastering stable hydrophobic modification processes, real weathering aging test data and formula technical support achieve steady order growth. Manufacturers without refined production capacity that only produce general powder struggle to enter the new energy photovoltaic track. Localization of the photovoltaic industrial chain accelerates, and procurement orders keep converging to upstream powder suppliers with stable quality control and complete environmental certifications.
Industrial research institutes predict that global newly-added photovoltaic installed capacity will maintain high growth in the next three years, the penetration rate of long-life silicone sealants will keep rising, and demand for fumed silica dedicated to photovoltaic encapsulation adhesives will grow steadily. Featuring high added value and long-term demand certainty, this segmented track enables silica manufacturers to escape low-price competition in traditional markets and make in-depth layout in the new energy new material industry.
In the long run, developing modified fumed silica for photovoltaic sealants helps domestic silicon-based powder enterprises accelerate import substitution of high-end fillers. Domestic silica manufacturers shall continuously optimize fumed synthesis and silane modification technologies, and complete compliance certifications for new energy component materials. Strengthen upstream and downstream collaborative R&D with sealant and photovoltaic material enterprises, iterate functional reinforcing fillers for new-generation high-efficiency photovoltaic modules, and enhance the competitiveness of domestic fumed silica in the global industrial chain of photovoltaic supporting materials.