SS304 Flange PTFE Lined EPDM Rubber Expansion Joint 1.0-2.5 MPa Chemical Pipeline

Chemical circuits punish elastomers. This joint answers that problem with a sintered PTFE liner bonded to the inner wall of the EPDM sphere, so the fluid touches only PTFE while the rubber behind it still provides the flexibility. Acids, alkalis, solvents and oxidising solutions that would attack plain rubber pass through without swelling or leaching the elastomer.

The body is clamped between SS304 flanges, which resist the same aggressive atmosphere that the process fluid creates around the pipework. Working stress of 1.0 to 2.5 MPa covers most dosing, transfer and recirculation duties, and the smooth PTFE bore discourages scale build-up and product retention. Because the liner is a continuous sleeve, there is no crevice at the flange face where corrosive liquid can stagnate.

• PTFE Barrier Liner: A continuous PTFE sleeve isolates the process fluid from the rubber, extending service life in acid, alkali and solvent duty.
• SS304 Flanges: Stainless flanges resist the corrosive atmosphere around chemical plant pipework and stay clean in hygienic areas.
• 1.0-2.5 MPa Rating: Working stress from 1.0 to 2.5 MPa covers dosing skids, transfer pumps and recirculation loops.
• Anti-Scaling Bore: The low friction PTFE surface limits crystal growth and product hold-up, which simplifies cleaning and product changeover.
• Vibration Isolation: The EPDM carcass behind the liner still absorbs pump vibration and thermal movement before it reaches the anchors.
• Leak-Free Sealing: The liner wraps over the flange face so the gasket seal is made against PTFE, not against an exposed rubber edge.

These joints are used on pickling and plating lines, acid dosing skids, chlor-alkali transfer, brine circuits, fertiliser plant pipework and pharmaceutical reactor connections. They are also chosen where product purity matters and a bare rubber bore is not acceptable. For very high temperature or strongly oxidising media, please confirm concentration and temperature so we can advise on liner thickness and gasket selection.

The PTFE face is protected with a soft cover during transit to prevent scratching, and each unit is hydrostatically tested before packing. Inner packing is plastic film and carton, outer packing a wooden sea freight case. We supply the pressure test record, PTFE material certificate and SS304 mill certificate on request, together with an installation note covering bolt torque and gasket choice.