русский
Deutsch
عربى
Gansu Juxiang Fluoroplastics Technology Co.,Ltd. manufactures expanded PTFE reinforced flange gaskets at our Yumen, Gansu production base, inside a wider fluoroplastic sealing range that also covers modified PTFE gaskets, filled PTFE components and large molded sealing frames. The gasket pairs a microporous ePTFE body with a 304 or 316 stainless steel insert and is supplied from DN10 to DN300 as standard, with non-standard diameters, thicknesses and full-face patterns produced to drawing.
We are a fluoroplastic manufacturer with production in Zhejiang and Gansu, supplying sealing components into chemical, chlor-alkali, semiconductor, hydrogen, pharmaceutical and marine projects. Gasket proposals are built around the actual flange interface, the media and the bolt load rather than a nominal size alone.
Our Position in the Sealing Range
As an Expanded PTFE Reinforced Flange Gasket manufacturer, we keep ePTFE sheet forming, insert preparation, bonding and finish machining within our own production chain, so reinforcement grade, gasket thickness and bore are set together for a project instead of being assembled across separate suppliers.
- Reinforced ePTFE gaskets — the DN10–DN300 range described below, for steel, glass-lined and plastic-lined flanges in corrosive duty.
- Modified PTFE gasket — machined rings where a denser, lower-creep body is preferred over a microporous structure.
- Large integrated molded PTFE sealing frame and gasket — single-piece sealing frames for vessel mouths, columns and large rectangular openings.
- Filled PTFE and PFA-backed glass fiber sheet — alternative facing materials where the duty calls for higher compressive strength or a different liner construction.
Construction and Performance Envelope
The body is expanded PTFE: a fibrillated, microporous structure with 40–60% compression recovery, which lets the gasket follow flange surface irregularities and hold sealing stress through thermal cycling. The stainless insert sits inside the ring and carries the bolt load, limiting cold flow and preventing the gasket from being crushed or extruded at the bore.
- Temperature: −200 °C to +260 °C continuous, with short-term excursions to 300 °C.
- Pressure: the reinforced construction is rated for system pressures up to 20 MPa, subject to flange class and bolt load.
- Chemical resistance: strong acids, strong bases, oxidants, chlorine and organic solvents, including concentrated sulfuric and hydrofluoric acid duty.
- Ageing: stable under UV and ozone; sealing performance does not decay in long-term storage or outdoor installation.
- Sealing behaviour: corrugated face geometry raises contact stress at low bolt load, which suits low-pressure, vacuum and thin-wall flange connections.
Standard Range and Dimensions
Standard stock covers DN10 to DN300, with 4 mm thickness up to DN125 and 8 mm from DN150 upward. Dimensions are confirmed against the mating flange standard, bolt circle and raised-face or full-face pattern supplied with the enquiry.
| Size | Gasket OD (mm) | Gasket ID (mm) | Thickness (mm) | Insert |
|---|---|---|---|---|
| DN10 | 40 | 23 | 4 | 304 / 316 |
| DN15 | 45 | 27 | 4 | 304 / 316 |
| DN20 | 55 | 33 | 4 | 304 / 316 |
| DN25 | 65 | 40 | 4 | 304 / 316 |
| DN32 | 77 | 48 | 4 | 304 / 316 |
| DN40 | 87 | 54 | 4 | 304 / 316 |
| DN50 | 102 | 66 | 4 | 304 / 316 |
| DN65 | 122 | 82 | 4 | 304 / 316 |
| DN80 | 137 | 95 | 4 | 304 / 316 |
| DN100 | 157 | 120 | 4 | 304 / 316 |
| DN125 | 187 | 146 | 4 | 304 / 316 |
| DN150 | 213 | 174 | 8 | 304 / 316 |
| DN200 | 268 | 225 | 8 | 304 / 316 |
| DN250 | 323 | 279 | 8 | 304 / 316 |
| DN300 | 373 | 330 | 8 | 304 / 316 |
Application Fit by Service Environment
| Service | Typical duty | Configuration focus |
|---|---|---|
| Chemical and fine chemical | Concentrated sulfuric, hydrofluoric and nitric acid; solvents; reactor and pipe flanges | 316 insert, 4 mm body, corrugated face |
| Chlor-alkali and chlorine | Wet chlorine, caustic, hypochlorite, oxidising media | 316 insert, full-face pattern, insert grade confirmed against the media list |
| Refining, power and flue gas | Hydrocarbons, steam, hot process lines, cycling temperature | 8 mm body from DN150, heavier bolting, creep-controlled insert |
| Semiconductor and electronics | Wet-bench chemicals, high-purity water, acid drainage | Low-permeability ePTFE body, clean handling, batch marking |
| Hydrogen and new energy | Hydrogen lines, electrolyte circuits, thermal cycling | Thin 4 mm section, low bolt load, vacuum-tight seating |
| Marine and desalination | Seawater, brine, salt-spray atmosphere, submerged pipelines | 316 insert, full-face ring, corrosion allowance at the bore |
| Pharmaceutical | Solvent transfer, CIP and SIP cycles, purification skids | Smooth ePTFE face, defined cleaning and packing routine |
Configuration Options and Flange Interface
- Insert grade: 304 stainless for general chemical and utility lines; 316 where chlorides, acids, seawater or wet chlorine are present.
- Thickness: 4 mm as standard to DN125, 8 mm from DN150; intermediate and heavier sections on request.
- Face geometry: corrugated as standard for low bolt load and vacuum duty, plain face where a smooth contact surface is specified.
- Pattern: ring type for raised-face flanges, full-face type with bolt holes drilled to the mating flange standard.
- Non-circular parts: oval, rectangular and frame-shaped gaskets machined to drawing for vessel mouths, manways and heat-exchanger covers.
- Marking: size, insert grade and batch reference on each gasket or its individual bag.
Installation, Acceptance and Documentation
The gasket is a single-use component and depends on the flange as much as on the material. Faces should be clean, flat and free of old gasket residue and radial scoring; the ring is centred on the bolt circle so the insert is fully supported, and bolts are brought up in a cross pattern in stages to the torque specified for the flange class.
- Check OD, ID, thickness and insert grade against the packing list before assembly.
- Do not reuse a gasket after compression; the recovery reserve is consumed on first tightening.
- Store flat, dry and out of direct UV, without hanging or point loading.
- Handle by the edge; avoid bending the insert, which breaks the bond between metal and ePTFE.
Each batch is checked for bore, outside diameter, thickness, insert grade and bond integrity before packing. The documentation pack follows the scope agreed at order confirmation and typically covers the dimensional record, insert material identification and packing list; where a project requires third-party inspection or a specific document format, we agree it before production.
Information We Use to Configure Your Solution
- Line size, flange standard and pressure class, and whether the joint is raised-face or full-face.
- Gasket OD, ID, bolt circle and bolt hole diameter, or a marked drawing of the flange.
- Media, concentration and phase, including any trace chlorides or oxidants.
- Operating and design temperature, pressure, and whether the line cycles or sees vacuum.
- Preferred insert grade and any restriction on wetted materials.
- Quantity per size, spare allowance and required delivery window.
- Marking, packaging, documentation and export packing requirements.
Frequently Asked Questions
What temperature and pressure range does the reinforced gasket cover?
Continuous service runs from −200 °C to +260 °C, with short-term excursions to 300 °C. The reinforced construction is rated for system pressures up to 20 MPa; the final figure for a given joint follows the flange class, bolt load and media, which we confirm when the line data is available.
Should the insert be 304 or 316 stainless steel?
316 is the usual choice for chlorides, acids, seawater and wet chlorine, where molybdenum content matters for pitting resistance. 304 covers general chemical and utility service. We match the grade to the media list supplied with the enquiry and state it on the quotation.
Can you produce non-standard sizes and full-face gaskets?
Yes. Outside diameters, bores, thicknesses and bolt patterns are machined to drawing, including full-face rings, oval and rectangular frames, and sections outside the 4 mm and 8 mm standards. Send the flange drawing or the measured interface and we will confirm the geometry before production.
How are the gaskets packed and what accompanies the shipment?
Gaskets are individually bagged, cartoned by size and palletised for export, with size, insert grade and batch reference marked on the bag or the gasket. The documentation pack is issued to the scope agreed at order confirmation, and packing can be adapted for sea freight or consolidated project deliveries.
Related Products and Categories
Our portfolio also includes Products for applications with different operating ranges, interfaces or integration requirements.
