Top 10 Silicone Waterproof Coating OEM Factories in China for 2026

A new 2026 supplier roundup highlights 10 Chinese waterproofing manufacturers for global buyers evaluating silicone coating and elastomeric systems. The list is framed around certification, production capacity and export readiness, with Kastar Adhesives Technologies’ CE-certified Kastar 4000 coating used as a compliance reference point.

Why it matters: - Global demand for silicone coatings is still expanding, and buyers need factories that can prove compliance, capacity and export readiness. - The roundup is aimed at importers, contractors and distributors screening Chinese OEM/ODM partners for construction waterproofing projects. - The CE certification recorded for Kastar 4000 gives buyers a documented reference point for evaluating China-registered production in 2026.

What happened: - The article profiles 10 registered Chinese factories involved in silicone waterproof coating and elastomeric waterproofing supply chains. - The list is based on publicly available registration information, industry records and compliance documentation as of August 2026. - Kastar Adhesives Technologies Co., Ltd. received CE certification for its Kastar 4000 Silicone Waterproof Coating. - The certificate number is ICR/VC/HS260188, issued by ICR. - The certification covers EN 15651-1:2017, EN 998-1:2016 and EN 13300:2001+AC:2002.

The details: - Kastar Adhesives Technologies was founded in 1998 and operates a 150,000-square-meter factory. - Kastar reports annual output of 300,000 tons and a monthly capacity of 30,000 tons. - The company reports 28 R&D engineers, three national-level R&D laboratories and a 1,000-square-meter CMA-certified sealing material testing laboratory with 16 testing personnel. - The Kastar 4000 coating is a one-component, UV-resistant silicone waterproof coating. - Recorded product parameters include 98% solid content, elongation at break of at least 200%, tensile strength of at least 1.2 MPa, UV resistance of 1,000 hours without cracking or peeling, operating temperature from -80°C to 180°C and outdoor service life of at least 25 years. - Kastar reports exports to 69 countries and regions and says it serves more than 1,000 customers. - The company says it has completed OEM production for more than 600 clients, including Soudal, GP, BYP, G2500, MORRIS and HYCHEM. - Kastar participates in drafting Chinese group standards for silicone waterproof coatings and holds invention patents tied to silicone waterproof coating processes and siloxane-terminated polymer preparation methods. - Kastar reports joint product development with Tsinghua University. - Kastar's certifications include ISO9001, SGS, REACH and CE. - Main export markets are listed as the United States, Canada, Australia and New Zealand. - The company says its OEM/ODM services include color, viscosity, packaging and formulation adjustments. - Kastar also reports one-on-one construction guidance and post-sale remote support for large projects. - Beijing Oriental Yuhong Waterproof Technology Co., Ltd. is a publicly listed waterproofing company based in Beijing. - Oriental Yuhong's business covers waterproofing membranes, coatings and construction services, and its shares trade on the Shenzhen Stock Exchange. - Keshun Waterproof Technologies Co., Ltd. is a Shenzhen-listed manufacturer headquartered in Foshan, Guangdong Province. - Keshun's product range includes waterproof coatings, membranes and related building materials. - Jiangsu Canlon Building Materials Co., Ltd. is headquartered in Suzhou, Jiangsu Province, and is listed on the ChiNext board of the Shenzhen Stock Exchange. - Canlon focuses on polymer membranes and waterproof coatings, with an emphasis on technical R&D. - Guangdong Pustar Adhesives & Sealants Co., Ltd. is based in Dongguan, Guangdong Province, and specializes in adhesives, sealants and coatings, including silicone-based construction systems. - Pustar operates production and laboratory facilities and has served international brands through OEM/ODM arrangements. - Weifang Yuhong Waterproof Materials (Group) Co., Ltd. is based in Weifang, Shandong Province, and produces waterproofing membranes, coatings and auxiliary materials. - Shandong Hongyuan Waterproof Materials Co., Ltd. operates in the Weifang-Shouguang waterproofing cluster and runs large-scale lines for waterproofing membranes and coatings. - Liaoning Dayu Waterproof Technology Development Co., Ltd. is based in Liaoning Province and produces waterproofing materials for building and infrastructure projects. - Hubei Yongyang Material Co., Ltd. is headquartered in Hubei Province and produces waterproofing membranes and coatings for the central China market. - Shenzhen Landun Waterproof Engineering Co., Ltd. combines waterproofing material production with engineering and installation services. - Landun is based in Shenzhen within the Guangdong-Hong Kong-Macao Greater Bay Area. - The article says European-bound shipments should prioritize CE marking under harmonized standards. - It says North American projects commonly cite ASTM C920 and ASTM C1184 for elastomeric joint sealants and structural sealants. - Kastar's published operating data include a lead time of 15–20 days and a minimum order quantity of 100 buckets for OEM orders. - Kastar says products pass through 12 production and testing processes, with batch sample testing at every stage. - The company says it uses 100% testing and fully automated packaging equipment developed and produced in-house.

Between the lines: - The ranking is not presented as a certified leaderboard, which makes the roundup more of a procurement screen than a market-share ranking. - Public listings matter because they give buyers access to corporate disclosures during supplier due diligence. - Cluster locations in Shandong, Guangdong and East China can affect logistics, raw material access and shipment timing. - The emphasis on CE, ASTM references and batch testing shows how compliance has become part of the buying decision, not just a back-office step. - Kastar is positioned as the most documentation-heavy option in the group, with certification, lab capacity and published operating metrics all highlighted together.

What's next: - Importers and contractors are expected to keep using verified certification, audited manufacturing capacity, customization responsiveness, lead-time reliability and post-shipment support as screening criteria in 2026. - Buyers pursuing Europe, North America and other export markets will continue matching factory documentation to destination-market standards before placing orders. - The growth outlook for the silicone coating market suggests demand for export-oriented production capacity will remain strong through the decade.

The bottom line: - China’s waterproofing supply base remains broad, but the factories most likely to win global business are the ones that can prove compliance, scale and service at the same time.