With the continuous upgrading of domestic exterior‑wall building coatings, industrial equipment coatings, outdoor steel‑structure and anti‑corrosion coating markets, end‑market requirements for comprehensive performance such as weather resistance, UV resistance, hydrophobic anti‑fouling property and anti‑chalking performance of coatings keep increasing, and the iteration speed of coating formulas is accelerating. As a key functional filler, hydrophobically modified silica has seen further release of market demand. At present, the overall silica market is still in the traditional summer off‑season. Transactions of ordinary precipitated silica are sluggish, and market activities are dominated by on‑demand restocking. Nevertheless, hydrophobically modified silica suitable for high‑end coating systems has shown independent market performance and achieved steady volume growth in coating‑related segments, becoming another important growth driver for the silica industry.

  In terms of downstream coating applications, outdoor‑used exterior wall paints for buildings, topcoats for construction machinery, anti‑corrosion coatings for steel structures and protective coatings for photovoltaic supports are long‑term exposed to complex environments with sunlight, rain and alternating day‑night temperatures. Coatings are prone to gloss loss, chalking, cracking, staining and fading, which directly shorten coating service life. Conventional unmodified silica features strong hydrophilicity and tends to agglomerate within coating systems with limited dispersion capacity, making it hard to satisfy strict specifications of high‑end outdoor coatings. Hydrophobically surface‑modified silica can effectively improve compatibility between powder and resin systems, and build uniform network structures inside paint films. It delivers thickening, thixotropic and anti‑settling functions, while greatly enhancing weather resistance, hydrophobicity and anti‑fouling performance of paint films and mitigating erosion caused by rain and ultraviolet rays. Such products are widely used in fluorocarbon coatings, polyurethane anti‑corrosion paints, weather‑resistant building exterior coatings, protective coatings for engineering machinery and anti‑rust coatings for metal components. As downstream coating enterprises accelerate product upgrading, more formula engineers adopt hydrophobically modified silica to optimize product performance. Downstream procurement patterns have also changed obviously. Coating factories reduce large‑volume stockpiling and shift to small‑batch, high‑frequency replenishment based on orders. Strict standards are set for hydrophobic degree, dispersibility and storage stability, and inquiry volume for high‑end grades keeps climbing. By comparison, general‑purpose precipitated silica mainly supplies rubber and ordinary shoe‑material sectors. High temperatures restrain downstream operating rates. Most enterprises consume existing inventories, large‑volume deals are limited, supply is abundant and market competition is fierce. Some manufacturers offer flexible prices to boost shipments, profit margins of general‑grade products keep shrinking, and market gaps between high‑end and commodity‑grade products keep widening.

  On the supply side, domestic silica manufacturers maintain stable plant operation, and inventories of general precipitated silica have accumulated. Many producers actively adjust product mix, cut output of ordinary grades and divert production capacity toward high‑value‑added modified products. However, coating‑specific hydrophobically modified silica has high technical barriers instead of simple surface coating treatment. Production requires precise control over primary‑particle size, specific surface area and surface hydrophobic modification rate. Grade switching demands repeated commissioning and equipment cleaning, resulting in long capacity‑expansion cycles and prohibiting rapid output expansion. Only a limited number of domestic enterprises can stably produce coating‑grade hydrophobically modified silica. Orders for relevant grades from leading manufacturers have been scheduled till mid‑to‑late September, and delivery cycles for custom‑tailored specifications are further extended. Hydrophobic fumed silica is also in tight supply. A large share of capacity flows into high‑end adhesives and electronic‑material sectors, further diverting available supply for coating markets and tightening supply‑demand balance for coating‑specific modified silica. Prices of soda ash, sulfuric acid and surface‑treatment additives fluctuate and bring cost pressure to manufacturers, offering solid cost support for high‑end modified products and strengthening producers’ firm price sentiment. General precipitated silica receives weak cost support amid raw‑material swings and remains weak‑stable, with price gaps among different categories continuing to expand.

  Foreign‑trade markets also hold growth potential. The global anti‑corrosion and architectural coating markets maintain steady expansion. Robust overseas demand for high‑weather‑resistance coatings drives steady export growth of supporting hydrophobically modified silica, with prominent order growth in Southeast Asia and the Middle East. Overseas coating clients impose strict standards on batch consistency, storage stability and hydrophobic effect of fillers, forcing domestic silica manufacturers to continuously polish modification technologies, narrow performance gaps versus imported products and accelerate domestic substitution of high‑end fillers. Meanwhile, export businesses face multiple challenges including fluctuating international freight rates, competition from local overseas manufacturers and compliance reviews for chemical exports, which constitute practical obstacles for Chinese enterprises engaged in overseas business.

  In the medium‑to‑long run, it is a confirmed long‑term trend for domestic coating industry to move toward high weather resistance, low VOC and high‑performance standards. Expanding outdoor anti‑corrosion and architectural coating markets will continuously generate incremental demand for hydrophobically modified silica. In the short term, demand from coating industries will stay sound and the tight‑balance pattern for hydrophobically modified silica is expected to continue. After entering the traditional chemical peak season in September, operating rates of traditional downstream sectors such as rubber and shoe‑making will gradually recover, and the silica market will receive dual driving forces from traditional demand and emerging coating‑related demand. Market practitioners shall keep tracking order changes of coating enterprises, price swings of upstream raw materials and commissioning progress of new production capacity for hydrophobically modified silica. Industry analysts point out that the silica industry has stepped out of the era driven merely by capacity expansion and price competition, and competition value of segmented tracks keeps rising. Manufacturers shall proactively adjust product layouts, dig deep into the niche track of weather‑resistant fillers for coatings, strictly guarantee product quality, optimize modification technologies and satisfy customized formula requirements from coating customers, so as to fully capture market dividends brought by coating‑industry upgrading.