KAIFIL supplies flat sealing gaskets for metal filter end faces, basket seats and removable filter holders. Choose PTFE, EPDM, NBR, FKM or silicone, with annular, full-face and drawing-cut profiles matched to the sealing land.
Share a drawing, reference sample or application requirements to discuss the configuration.
PTFE flat annular gaskets
A gasket closes the joint between two clamped faces around the filter element. Its inner opening leaves the flow passage clear, while the annular contact area separates the intended flow path from the surrounding joint. We match the gasket outline to the end cap, seating shoulder or holder face so that the clamp load acts on a continuous sealing land.
Annular gaskets suit circular seats with a clear central passage. Full-face gaskets extend across the mating face and include the required bolt holes. Drawing-cut gaskets add tabs, slots or non-circular openings to fit an equipment-specific holder. Molded profiles can incorporate a controlled lip or raised sealing feature when a flat cut part does not match the seat.
Virgin PTFE provides a chemically resistant sealing surface without an elastomer base. Common sheet-cut thicknesses are 1.0, 1.5, 2.0 and 3.0 mm. Specify virgin, filled or expanded PTFE explicitly: the different constructions have different compression and creep behavior. Select the thinnest section that accommodates the mating faces and closure travel.
EPDM is a useful starting choice for water-based systems and compatible aqueous cleaning processes. NBR suits mineral-oil service. FKM covers many oil, fuel and elevated-temperature chemical duties. Silicone offers flexibility over a broad temperature span for compatible static joints. Select the exact compound using the process fluid, cleaning agent, concentration and temperature together; material color is an identification option, not a grade specification.
The finished gasket should sit flat without extending into the active filter area or catching on a locating shoulder. Hole position, inner-edge clearance and local sealing width matter as much as the overall diameter. For a narrow seat, define the gasket and metal-part tolerances together to keep continuous contact around the full circumference.
Clean the mating faces, center the gasket and close the joint evenly using the equipment tightening sequence. Use the specified gasket thickness to preserve the intended filter stack height. After dismantling, replace a gasket that is permanently compressed, cut, hardened or chemically swollen. Pressure capability is established by the complete clamped joint, including its face geometry and fasteners.
A flanged filter insert uses its metal flange to locate the element and its gasket to close the bypass path around that flange. The gasket’s inner edge clears the active opening, while its outer contour and bolt holes follow the mating face. Disc holders use the same separation of functions: the metal seat supports the filter and the gasket seals the joint. The assembly bill lists sealing position, profile, material and finished thickness independently from the filter-medium grade.
| Component / interface | Defined function and inspection |
|---|---|
| Filter flange or disc holder | Rigid support and locating surface |
| Gasket sealing land | Continuous contact around the flow opening |
| Inner opening | Clears the filter area and locating shoulder |
| Bolt-hole pattern | Matches the mating flange layout |
| Installed stack | Gasket thickness and metal seats set closure height |
| Thickness (mm) | Gasket construction | Dimension definition |
|---|---|---|
| 1.0 | PTFE sheet-cut flat gasket | Nominal free-state thickness before clamping. |
| 1.5 | PTFE sheet-cut flat gasket | Nominal free-state thickness before clamping. |
| 2.0 | PTFE sheet-cut flat gasket | Nominal free-state thickness before clamping. |
| 3.0 | PTFE sheet-cut flat gasket | Nominal free-state thickness before clamping. |
| Supply item | Order basis |
|---|---|
| Production lead time | 2–3 weeks after order and drawing confirmation. |
| Trial orders | Small trial quantities for fit and process evaluation. |
| Regular production orders | 50 pieces or US$3,000 per order. |
| Quotation basis | Material, finished dimensions, section geometry, mating interface and quantity. |
| Parameter | Specification | Notes |
|---|---|---|
| Seal profile | Flat annular / full-face / drawing-cut | Match the complete sealing land. |
| Material options | PTFE / EPDM / NBR / FKM / VMQ | Select the compound for the process and cleaning fluid. |
| Common PTFE thicknesses | 1.0 / 1.5 / 2.0 / 3.0 mm | Nominal thickness of the finished sheet-cut gasket before clamping; virgin, filled and expanded PTFE remain separate material constructions. |
| Dimension definition | OD × ID × thickness | Add hole pattern and contour for full-face or non-circular parts. |
| Rubber construction | Die-cut sheet / molded profile | Cut parts for flat faces; molded parts for raised or shaped seats. |
| PTFE construction | Virgin / specified filled / expanded | Keep the material construction separate on the drawing and purchase description. |
| Sealing width | (OD − ID) / 2 | For a concentric annulus; check local width around holes or tabs separately. |
| Bolt pattern | Hole diameter / count / PCD | Full-face gaskets use the mating flange hole layout. |
| Seal duty | Static face sealing | Filter end faces, basket seats and removable holders. |
| Identification | Material / dimensions / drawing revision | Keep sealing material identification with the part batch. |
| Delivery format | Loose gaskets / assembly-matched sets | Identify each sealing position when several gaskets share one assembly. |
Materials: Virgin PTFE; EPDM; NBR; FKM; silicone (VMQ). Filled or expanded PTFE can be specified as a separate material construction.
Examine the part profile, contact faces and construction details.
PTFE gaskets in different diameters
Flat gasket faces and central openings
Include these details when discussing your requirements.
Annular gaskets close the joint between a metal end cap and its clamping seat.
Flat or profile-cut gaskets follow the holder perimeter and leave the screen opening clear.
A matched gasket provides a compressible sealing layer beneath a basket flange or removable cover.
A flat gasket is compressed between faces over an annular or shaped area. An O-ring has a circular section and normally works in a designed groove. Choose the seal type from the joint geometry.
EPDM is commonly selected for compatible water and aqueous cleaning service; NBR is commonly selected for mineral oils. FKM and PTFE cover additional chemical duties. Include the cleaning fluid in the material specification.
No. Use enough thickness to accommodate the sealing faces while maintaining the designed closure height and clamp load. Extra thickness can increase deformation and relaxation.
Yes. We supply annular, bolt-hole and contour-cut profiles. A dimensioned drawing should identify hole centers, local sealing widths and the assembly orientation.
Yes. Gaskets can be supplied as separate spares or as a set matched to the metal filter, holder and sealing position.
The compound and joint design work together. Specify operating and cleaning temperatures, pressure, face dimensions and clamp arrangement so the gasket is selected for that joint.
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