DN350 Acid Resistant Rubber Joint

The DN350 acid resistant rubber joint is an acid-resistant flexible connection accessory developed by us for DN350 medium and large-diameter strongly corrosive pipelines. DN350, as a commonly used nominal diameter for large-diameter acid-alkali conveying pipelines in scenarios such as chemical parks, sewage treatment plants, and electroplating plants, combined with a dedicated acid-resistant rubber formula and PTFE lining structure, can operate stably for long periods under corrosive medium working conditions such as strong acids, weak acids, and industrial sewage. Ordinary rubber joints rapidly corrode, powder, bulge, and leak when in contact with acidic media such as sulfuric acid, hydrochloric acid, and nitric acid, with extremely short service life. The DN350 acid resistant rubber joint internally adds a thickened acid-resistant isolation layer, with the main body compositely molded using corrosion-resistant special rubber, paired with an optional PTFE lining solution, capable of long-term stable contact with weak acids, weak alkalis, industrial sewage, and chemical cleaning media, with the rubber layer not corroded, powdered, or perforated, and service life far exceeding ordinary general-purpose rubber joints. The product adopts a single-sphere one-piece molding and vulcanization process, with the sphere reinforced by multi-layer tear-resistant cord, capable of absorbing axial expansion and contraction, lateral offset, and angular deflection of DN350 large-diameter pipelines, buffering chemical pump operation vibration, and protecting corrosion-resistant pipelines and valves from stress damage.

Our factory has over 20 years of R&D and manufacturing experience in anti-corrosion rubber joints. We have specially optimized the acid-resistant rubber compound formula and large-diameter molding process for DN350 acid resistant rubber joints. The DN350 medium and large-diameter sphere wall thickness is thickened by 20% compared with conventional products, with increased internal cord layers, ensuring the structural stability of large-diameter acid-resistant products under dual high-pressure and corrosion working conditions. The product nominal diameter is DN350 (can be customized with the full series of acid-resistant specifications from DN25 to DN3000), with working pressure PN6-PN16. The rubber main body adopts acid-resistant special rubber, with optional PTFE anti-corrosion lining to adapt to stronger corrosion working conditions. For flanges, SS304 and SS316 stainless steel anti-corrosion models are preferably recommended, with anti-corrosion carbon steel also available as an alternative. Working temperature is -15°C to +80°C, with special acid-alkali resistant rubber compound of -30°C to +150°C customizable for high-temperature pickling working conditions. Flange dimensions are compatible with global mainstream standards of DIN, ANSI, GB, and JIS. For overseas chemical parks, sewage treatment plants, electroplating plant engineering contractors, and distributors, we can individually adjust lining thickness and rubber compound ratio according to customer acidic medium concentration and temperature, with customized samples in 15-20 days and minimum order quantity of 10 pieces. Overseas chemical equipment and water affairs distributors can trial order at low threshold to build an anti-corrosion dedicated differentiated product line. Currently, DN350 acid resistant rubber joints have been applied in batches to chemical park pickling production lines, industrial sewage treatment plants, electroplating wastewater conveying pipelines, paper mill acid-alkali circulation systems, and other projects. Products are exported to over 80 countries and regions worldwide, and with the dedicated performance of large-diameter acid resistance, they have become designated acid-resistant flexible joints for numerous overseas chemical and environmental protection engineering contractors.

The product is widely used in chemical park pickling production lines, industrial sewage treatment plant large-diameter inlet and outlet main pipes, electroplating wastewater conveying pipelines, paper mill acid-alkali circulation systems, printing and dyeing sewage pipelines, metallurgical pickling cooling pipelines, chemical plant area weak acid medium conveying main pipes, and other strongly corrosive working condition scenarios. It is an ideal acid-resistant flexible connection accessory for large-diameter pipelines at chemical pump, corrosion-resistant valve, and sewage treatment equipment inlets and outlets.

We are one of the earliest domestic manufacturers engaged in acid-resistant and anti-corrosion pipeline flexible components, with over 20 years of industry experience and technical accumulation. Our factory covers an area of 10,000 square meters, equipped with a rubber acid-alkali resistant formula laboratory, fully automatic vulcanizing machine units, and stainless steel flange CNC machining equipment, with all processes completed independently without outsourcing. A 50-person professional production and technical team, with multiple technical personnel having over ten years of anti-corrosion rubber R&D experience, can quickly adjust product structure according to customer medium acid-alkali value, with stable monthly production capacity of 15-20 standard containers. DN350 acid resistant rubber joints maintain regular specification inventory, with chemical project urgent orders eligible for priority production scheduling. Products are exported to over 80 countries worldwide, and we are familiar with overseas chemical industry acceptance specifications, able to assist customers in preparing a full set of project bidding materials.

The full series of DN350 acid resistant rubber joints possess complete international compliance qualifications. The production system has passed dual certification of GB/T19001-2016/ISO9001 Quality Management System and GB/T45001-2020/ISO45001 Occupational Health and Safety Management System. The products have obtained CE and RoHS compliance licenses, along with supporting material MTC certificates, acid-alkali resistance test reports, and certificate of origin (CO). All qualification documents can be provided in electronic version in advance for overseas chemical project bidding, or can be sent in paper form with the goods. Complete compliance qualifications can help distributors smoothly undertake chemical park and large environmental protection sewage treatment project orders, avoiding bid loss and customs clearance obstruction caused by missing qualifications.

A dedicated cross-border after-sales team is available 7×24 hours for online Q&A. The product comes with a unified 24-month warranty. During the warranty period, quality issues such as corrosion leakage, rubber layer powdering and cracking, and interface delamination caused by non-human external forces will be replaced with brand new products free of charge. Before sales, we can issue exclusive acid-resistant selection solutions and lining thickness recommendations for acidic medium concentration, temperature, and pressure working conditions. During the order production stage, we regularly push real-time photos and videos of acid-resistant rubber compound mixing, vulcanization molding, and finished products to synchronize production progress. After the goods are shipped, we synchronize bills of lading and packing lists, and follow up on ocean shipping logistics status throughout the process. For long-term stable cooperating chemical and environmental protection engineering contractors, we offer value-added services such as priority production scheduling channels, one-on-one technical specialist remote guidance, and priority trial sales of new products, comprehensively assisting customers in developing the acid-resistant and anti-corrosion pipeline supporting market.

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