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Gansu Juxiang Fluoroplastics Technology Co.,Ltd. is an Expanded PTFE Sheet & Gasket manufacturer operating from a production base in Yumen City, Gansu Province, with a second base in Zhejiang. We produce fibrillated PTFE sheet from 100% PTFE and convert it into ring gaskets, full-face gaskets and large-diameter sealing components for chemical, pharmaceutical, food, semiconductor and power plant flange assemblies.
The sheet is built from multi-directional PTFE fibres rather than skived or moulded stock, so bolt load is carried by an isotropic network of interlocked fibrils. That structure gives the material its low creep, its tolerance of pitted or slightly damaged flange faces, and its resistance to delamination during handling and installation.
Range We Manufacture
Sheet is pressed in standard formats and in extended lengths for large vessel, duct and tank-mouth flanges. Gaskets are cut to DN sizes or to customer drawings, with outside diameter capped at 1500 mm on our largest format.
- Sheet thickness from 0.5 mm to 12 mm in 1520 × 1520 mm and 1500 × 1500 mm formats.
- Extended sheet at 1520 × 4500 mm and 1520 × 6000 mm for strip-cut and segmented gasket work.
- Wide sheet at 2500 × 5000 mm for large-diameter and non-standard flanges.
- Ring and full-face gaskets from DN10 to DN2000, plus custom profiles cut to drawing.
- Expanded PTFE Reinforced Flange Gasket where a glass-fibre or metal insert is needed for blow-out resistance and tighter bolt-load retention.
Sealing Performance and Operating Limits
Measured values on 0.8 mm and 2.0 mm sheet show how thickness shifts the balance between tightness and stress relaxation. Thinner sheet seals clean, machined faces with less bolt load; thicker sheet conforms to worn faces but relaxes further where the joint cycles in temperature.
| Property | Value | Basis |
|---|---|---|
| Thickness range | 0.5 mm – 12 mm | Standard formats |
| Sheet formats | 1520 × 1520, 1500 × 1500, 1520 × 4500, 1520 × 6000, 2500 × 5000 mm | Press formats |
| Gasket size | DN10 – DN2000; outside diameter up to 1500 mm | Cut gaskets |
| Temperature range | −160 °C to +290 °C | Material data |
| Operating pressure | Vacuum to 3000 psi | Material data |
| Chemical resistance | pH 0–14, excluding molten alkali metals and elemental fluorine | Material data |
| Sealability | 0.06 ml/hr at 0.8 mm; 0.17 ml/hr at 2.0 mm | ASTM F37B |
| Compression ratio | 63.6% at 0.8 mm; 63.4% at 2.0 mm | ASTM F36 |
| Elastic resilience | 8.80% at 0.8 mm; 9.10% at 2.0 mm | ASTM F36 |
| Stress relaxation | 16.3% at 0.8 mm; 37.1% at 2.0 mm | ASTM F38 |
| Food and pharmaceutical contact | Complies with FDA 21 CFR 177.1550 | Material statement |
The material does not age in storage and is not subject to contamination under normal warehouse conditions, so gaskets can be held as line spares without a shelf-life limit. It contains no asbestos or other additive phase.
Where the Material Fits
Expanded PTFE gaskets are used where a soft, chemically inert seal must sit between metal flanges without contaminating the process stream or embrittling in service.
- Chemical and petrochemical piping, storage tanks and tank-mouth flanges handling acids, caustics and solvents across the full pH range.
- Pharmaceutical and food processing lines where FDA 21 CFR 177.1550 compliance is part of the validation file.
- Semiconductor wet benches, chemical delivery lines and high-purity gas manifolds.
- Power generation, paper, shipbuilding and medical equipment flanges.
- Crude, warped or corroded flange faces where a conformable gasket is needed to re-establish a seal without re-machining.
Configuration and Fabrication Choices
Thickness, geometry and insert selection follow the flange standard, the bolt load available and the thermal cycle of the line rather than a single default specification.
- 1.5 mm to 3 mm sheet for sound raised-face steel flanges with a defined bolt load.
- 3 mm to 6 mm for pitted faces, cast-iron housings and low-pressure joints where conformability matters more than relaxation.
- Ring gaskets for raised-face joints; full-face gaskets for flat-face, low-pressure water and air service.
- Modified PTFE Gasket where higher pressure or tighter creep control is required than expanded sheet can hold.
- PTFE Thread Seal Tape for threaded connections in the same assembly.
Quality Control and Acceptance
Sealability, compression and recovery, and stress relaxation are measured to ASTM F36, F37B and F38 on reference thicknesses, and the recorded values are issued with the batch documentation. Sheet lots are identified so the reported data can be traced to the gaskets delivered.
- Dimensional inspection of cut gaskets against the drawing, including outside diameter, inside diameter and bolt-circle positions.
- Thickness verification across the sheet, with the tolerance agreed at order stage.
- ASTM test values reported per batch on request, alongside the FDA 21 CFR 177.1550 material statement.
- Third-party inspection and witness testing arranged when the project specification calls for it.
Information We Use to Configure Your Solution
A proposal is built from the working point, not from a catalogue number. These inputs let us fix thickness, geometry and insert type in one pass.
- Flange standard and size: DN or NPS, pressure class, and face type (raised face, flat face, tongue-and-groove).
- Media, concentration and any trace components, including oxygen or halogen service.
- Operating and design temperature, design pressure and available bolt load.
- Gasket dimensions or a drawing, with quantity per size and the delivery schedule.
- Documentation, inspection and packaging requirements for the receiving site.
Frequently Asked Questions
What thickness do you recommend for a standard raised-face flange?
For sound, machined raised faces we normally supply 1.5 mm or 2.0 mm sheet. Where faces are pitted, the joint cycles in temperature, or the flange is cast iron, 3 mm gives more conformability at the cost of higher relaxation. We confirm the final thickness against the pressure class and bolt load before quoting.
Can you cut gaskets above DN1000?
Yes. Ring and full-face gaskets are cut from DN10 to DN2000, with outside diameter up to 1500 mm. Larger assemblies are handled by segmenting from the 2500 × 5000 mm wide sheet or the 1520 × 6000 mm extended format.
Is expanded PTFE suitable for oxygen or molten alkali service?
The standard grade is specified for pH 0–14 service excluding molten alkali metals and elemental fluorine. Oxygen and other strong oxidising media are reviewed individually before we confirm a material recommendation.
How is sheet supplied for site cutting?
Sheet is packed flat in 1520 × 1520 mm, 1500 × 1500 mm, 1520 × 4500 mm, 1520 × 6000 mm and 2500 × 5000 mm formats, in thicknesses from 0.5 mm to 12 mm. Cut gaskets and sheet can be combined in one shipment where a maintenance stock is being built.
