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Gansu Juxiang Fluoroplastics Technology Co.,Ltd. produces compressed non-asbestos fiber rubber gasket sheet and finished gaskets alongside a wider fluoroplastic and high-performance sealing range manufactured at our Zhejiang and Gansu bases. The JXF5220 family replaces asbestos jointing in plant sealing duty where the joint still has to hold water, steam, refrigerant, gasoline, lubricating oil and aliphatic hydrocarbon service at temperatures up to 300 °C and pressures up to 6.4 MPa.
Refineries, chemical plants, thermal power stations, metallurgy lines, instrumentation assemblies and automotive fluid systems use these sheets as a general-purpose sealing material. We supply them as 1500 × 1500 mm sheet for in-house conversion, or cut to ring, full-face and special-profile gaskets against customer drawings. As a Non-Asbestos Fiber Rubber Gasket manufacturer, we hold the formulation, calendering and vulcanising steps in-house so that grade, thickness and gasket geometry stay under one specification.
Four Grades Built on Four Binder Systems
Grade selection is driven by the binder and reinforcement, not by thickness alone. Each grade in the range is a distinct formulation with its own compression window, recovery behaviour and temperature ceiling, and each is pressed and vulcanised from 100% asbestos-free filling fibres, synthetic fibres, latex and additives.
- JXF5220 — NBR binder with synthetic fibre. The economic general-service sheet for water, refrigerant, aliphatic hydrocarbons, gasoline and lubricating oil, from −40 to 260 °C at 4 MPa.
- JXF5220S — NBR with aramid fibre. Highest tensile strength (≥10 MPa) and highest rebound (≥45%) in the family, and the grade we specify for 6.4 MPa service.
- JXF5230 — flexible graphite with synthetic fibre. Extends the range to 300 °C and suits hot process lines, thermal equipment and higher-temperature flange joints.
- JXF5290 — NBR with synthetic fibre, formulated for low-temperature duty down to −196 °C and supplied in thin sheet from 0.5 mm.
| Grade | Binder / reinforcement | Service temperature | Max pressure | Compression / rebound | Tensile strength |
|---|---|---|---|---|---|
| JXF5220 | NBR + synthetic fibre | −40 to 260 °C | 4 MPa | 5–19% / ≥40% | ≥7 MPa |
| JXF5220S | NBR + aramid fibre | −40 to 280 °C | 6.4 MPa | 5–19% / ≥45% | ≥10 MPa |
| JXF5230 | Flexible graphite + synthetic fibre | −50 to 300 °C | 4 MPa | 5–17% / ≥40% | ≥7 MPa |
| JXF5290 | NBR + synthetic fibre | −196 to 260 °C | 4 MPa | 7–12% / ≥40% | ≥5 MPa |
All four grades are tested to a leakage rate of ≤1.0×10⁻³ and to oil resistance within 15, which is the basis on which we match a sheet to fuel, lubricant and hydraulic circuits.
Sheet Format and Gasket Conversion
JXF5220, JXF5220S and JXF5230 are supplied in 1.5, 2.0, 3.0 and 4.0 mm sheet; JXF5290 in 0.5, 0.8, 1.0, 1.5 and 3.0 mm. Thickness is chosen against flange face condition and available bolt load rather than by habit: a thinner sheet seats within a narrower compression band and suits machined raised faces, while thicker sheet absorbs more distortion on cast, pitted or re-used flanges.
We convert sheet into ring gaskets, full-face gaskets and non-standard profiles to drawing, including outside and inside diameters that fall outside standard envelope tables. Tolerances, bolt-hole pitch and tab or web details are taken from the drawing supplied with the enquiry, and special specifications are reviewed by our technical centre before release.
Sealing Behaviour and Installation Fit
Compression rate, recovery and stress relaxation decide whether a joint stays tight through thermal cycling. The range is built with a controlled compression window and a rebound of at least 40% so the gasket retains seating stress as flanges move under temperature change.
- Seat the gasket inside its compression window; over-compression crushes the fibre structure and removes the recovery the joint depends on.
- Match sheet thickness to flange finish and flatness — rough or warped faces need the thicker sheet and a correspondingly higher bolt load.
- Tighten in a cross pattern in stages, and retorque after the first thermal cycle on hot lines.
- Gaskets are single-use; a compressed fibre joint that has been disturbed is replaced, not re-seated.
Water, refrigerant, aliphatic hydrocarbons, gasoline and lubricating oil sit inside the standard application range. Media such as CO, O₂, H₂S, H₂O, NO and CH₄, and strongly oxidising or aggressive process streams, are reviewed with our technical centre before a grade is released, because binder compatibility rather than temperature alone governs the choice.
Compliance and Acceptance Evidence
Sheets in this range hold ABS, CCS and DNV certification and have passed the API 607 fire resistance test. Those are the evidence points most often written into project specifications for petroleum, marine and thermal power sealing packages.
Delivery documentation identifies grade, sheet thickness, batch and the certificate reference that applies, so incoming inspection can be tied back to the certified product rather than to a generic material description. Where a project requires a specific certificate set or a witnessed acceptance test, that requirement is fixed at the quotation stage and reflected in the packing list.
Where This Range Sits in Our Sealing Portfolio
Non-asbestos fibre sheet is the utility end of our sealing range, and it is not always the right answer for a given flange. Where the medium attacks the elastomer binder — concentrated acids, solvents, oxidisers — the specification moves to a Modified PTFE Gasket or a filled PTFE sheet. For fragile, vacuum or low-bolt-load flanges, an Expanded PTFE Reinforced Flange Gasket conforms at lower seating stress. Groove sealing on pumps, valves and instrumentation heads is handled by a moulded Rubber O-ring rather than a flat cut gasket.
Because we produce the fluoroplastic side of the portfolio as well, a mixed sealing package for one plant — fibre sheet for utility lines, PTFE and PFA components for chemical duty — can be quoted and shipped together with consistent documentation.
Information We Use to Configure Your Solution
A workable quotation needs the working point, not just a size. The following inputs let us fix grade, thickness and gasket geometry without a second round of questions.
- Medium, concentration and phase, including any trace components such as CO, O₂, H₂S or CH₄.
- Operating temperature and pressure, plus maximum excursion and whether the joint sees cycling or steady load.
- Flange standard, nominal size, pressure class, face type and surface finish; a drawing where the profile is non-standard.
- Bolt size, bolt load or torque procedure where the client specifies one.
- Quantity per size, whether sheet or finished gaskets, and whether spares are required for a shutdown kit.
- Certificate and documentation requirements, marking, and packaging suitable for the site store or export transit.
Ordering, Packing and Delivery Scope
Orders are released as full sheet, cut gaskets or a mixed schedule of both. Sheet is packed flat to protect the cut edge and the surface finish; finished gaskets are bundled by size and tagged with grade and thickness so that site stores can issue them against a line number without opening every pack.
Custom sizes, non-standard profiles and project-specific marking are part of normal production rather than an exception, and the same engineering team follows the order from drawing review through to dispatch. Spare requirements for planned shutdowns are quoted at the same time as the initial order so that the second delivery matches the first in grade and thickness.
Frequently Asked Questions
What are the temperature and pressure limits of the range?
JXF5230 reaches 300 °C and JXF5220S carries 6.4 MPa; JXF5220 and JXF5290 are rated to 4 MPa, and JXF5290 extends down to −196 °C. Temperature and pressure are applied together, so a joint at the top of the temperature band is not simultaneously run at the top of the pressure band.
Can you cut gaskets to our own flange drawing?
Yes. We cut ring, full-face and special-profile gaskets from 1500 × 1500 mm sheet to supplied drawings, including non-standard outside and inside diameters, and we review the drawing against the intended service before production.
Which certificates come with the gasket?
The sheet range holds ABS, CCS and DNV certification and has passed the API 607 fire resistance test. Documentation issued with the order identifies grade, thickness, batch and the applicable certificate reference.
How do you handle service involving CO, O₂, H₂S or other reactive media?
Those streams are referred to our technical centre before a grade is confirmed. Binder compatibility with the specific medium decides the recommendation, and in some cases the answer is a PTFE-based gasket rather than a fibre sheet.
