Square Flange EPDM Expansion Joint

The square flange EPDM expansion joint is a special-type flexible expansion joint adopting a square flange connection structure paired with an EPDM rubber main body. Different from conventional circular flange products, square flanges can be directly docked with special structures such as square interface equipment, rectangular air ducts, and square boxes, without the need for circular-to-square transition conversion flanges. It is particularly suitable for scenarios such as HVAC rectangular air ducts, square dust removal pipelines, square water tank interfaces, and square equipment inlets and outlets. The square flange EPDM expansion joint uses EPDM (ethylene propylene diene monomer) as the main raw material, combined with a high-strength nylon cord framework molded and vulcanized in one piece. EPDM material features excellent weather resistance, ozone resistance, UV resistance, and aging resistance, particularly suitable for working conditions with high requirements for aging resistance such as outdoor exposure and air duct exhaust. The product can efficiently absorb axial expansion and contraction, lateral offset, and angular deflection of square pipelines, buffer vibration generated by fans and equipment operation, reduce operating noise of the air duct system, and avoid the probability of leakage and cracking at square interface connections caused by repeated stress pulling from the source.

Our factory has over 20 years of R&D and manufacturing experience in special-structure rubber expansion joints. We have specially optimized the square flange molding process and EPDM rubber compound formula for square flange EPDM expansion joints. Square flange dimensions can be customized and processed according to square interface drawings provided by customers, with flange sealing surfaces and bolt hole positions 100% matched to customer equipment interfaces, requiring no modification for on-site installation. The EPDM rubber main body adopts high-quality ethylene propylene diene monomer compound, with a temperature resistance range of -30°C to +120°C, excellent weather and aging resistance, and is not prone to hardening and cracking after long-term outdoor use. The product square interface dimensions cover 100mm×100mm to 2000mm×2000mm (any rectangular size can be customized as needed), with working pressure PN2.5-PN10 (lower pressure can be customized for air duct low-pressure working conditions), meeting the operational needs of the vast majority of square air ducts and square equipment interfaces. Flange materials are available in multiple grades including anti-corrosion carbon steel and SS304 stainless steel. For overseas HVAC equipment manufacturers, dust removal system integrators, square equipment supporting dealers, and distributors, we support customization of any square size, flange material, and EPDM rubber compound performance according to drawings, and can provide square dimension test reports and material certificates with the goods. Currently, square flange EPDM expansion joints have been applied in batches to HVAC rectangular air ducts, industrial dust removal square pipelines, square water tank inlets and outlets, square fan interfaces, environmental protection equipment square connections, and other projects. Products are exported to over 80 countries and regions worldwide, and with the convenience of direct docking of square flanges and EPDM's excellent weather and aging resistance, they have become designated supporting flexible expansion joints for numerous overseas HVAC and environmental protection equipment manufacturers.

The product is widely used in HVAC rectangular air duct systems, industrial dust removal square pipelines, square water tank inlet and outlet connections, square fan interfaces, environmental protection equipment square pipelines, laboratory exhaust square air ducts, outdoor exposed square air ducts, and other scenarios, particularly suitable for air duct and square equipment supporting projects requiring direct docking of square flanges and with high requirements for weather and aging resistance.

We offer full-chain personalized customization services. We can customize any rectangular size, flange bolt hole layout, overall product length, and sphere wall thickness according to square interface drawings provided by customers. For different temperature and corrosion working conditions, we can individually formulate EPDM rubber compound formulas to create special high-temperature and acid-alkali resistant solutions. We support printing customers' own brand LOGOs and customizing exclusive outer packaging cartons and labels. Special structures such as any rectangular size, reducer square, extended sphere, and thickened pressure-bearing design can all be independently molded for production. The customized sample development cycle is controlled at 15-20 days, and small-batch mixed orders in the industry can also be flexibly accepted, with a minimum order quantity of only 10 pieces, lowering the trial order threshold for overseas distributors. For long-term cooperating major customers, we can provide free product drawings, technical manuals, and square interface selection solutions, assisting distributors in building their own special-structure differentiated product matrix and escaping homogeneous low-price competition of circular flange products.

An exclusive protective packaging solution is designed for ocean shipping of square flange products. Small square interface products are individually packed in thickened waterproof and moisture-proof cartons, with high-density foam pads filled inside to isolate products and prevent square flange corner bump deformation and rubber sphere scratches during transportation. Medium and large square interface products are individually wrapped with multiple layers of waterproof plastic film to isolate seawater moisture, externally reinforced with customized fumigated solid wood wooden boxes or steel frames to prevent square flange deformation and sphere flattening caused by lifting and ocean shipping extrusion. Outer packaging is printed with bilingual (Chinese-English) product parameters, square interface dimension labels, and lifting direction indicators, facilitating overseas warehouse inventory and lifting operations. Long-term cooperating customers can customize their own brand outer carton printing. We have long-term cooperation with leading ocean freight forwarders, with real-time trackable logistics information throughout the process. After shipment, we synchronize bills of lading and packing lists, minimizing transportation losses and customs clearance troubles for square products.

For regular standard in-stock square products, a 30% advance payment is required, with the remaining 70% balance settled before shipment. For customized products requiring mold opening or special square sizes, a 50% advance deposit is required, with the balance fully settled before shipment. For single full-container large-batch purchases, tiered purchase discounts can be applied, with greater unit price discounts for larger purchase quantities. We support multi-currency cross-border settlement in US dollars, euros, British pounds, and RMB. Trade terms can be selected from EXW (Ex Works), FOB (Free On Board), and C&F (Cost and Freight), flexibly adapting to the trade operation habits of different overseas HVAC and environmental protection equipment manufacturers.

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