Asbestos Rubber Sheets
Model:KXT ARS
Asbestos rubber sheets (model KXT ARS, grades KXB150 to KXB510) are compressed asbestos fibre sheets made from chrysotile asbestos fibre, rubber binder and heat-resistant fillers, manufactured to GB/T 3985-2008. Eight grades cover +150 °C to +510 °C and 1.5 MPa to 14 MPa, with tensile strength up to 21 MPa. Standard sheet sizes up to 4600 × 1500 mm, thickness 0.3–6.0 mm. Suitable for steam, water, air, oil and non-oxidizing chemical flange gaskets. Non-asbestos alternatives (KNXB series) available for restricted markets.
Asbestos Rubber Sheets (also called compressed asbestos fibre sheets, CAF sheets or asbestos jointing sheets; Kaxite model KXT ARS) are sealing sheets produced from chrysotile asbestos fibre, rubber binder and heat-resistant fillers, then compressed and calendered into a dense, paper-like sheet. They are manufactured to GB/T 3985-2008 and supplied in eight standard grades from KXB150 to KXB510, covering service temperatures from +150 °C to +510 °C and working pressures from 1.5 MPa to 14 MPa.
Asbestos rubber sheets are one of the most traditional and cost-effective sealing materials for steam, water, air, oil and non-oxidizing chemical service. They are widely used to cut flange gaskets, vessel gaskets and general industrial die-cut parts. Standard sheet sizes go up to 4600 × 1500 mm, with thickness from 0.3 mm to 6.0 mm.
Regulatory note — please read before ordering. Asbestos is a regulated material in many countries. Buyers are responsible for confirming that import, sale and use of asbestos-containing products are permitted in their market and for complying with all applicable health, safety and disposal regulations. For markets where asbestos is restricted or prohibited, Kaxite supplies equivalent non-asbestos jointing sheets (KNXB series) — please see the non-asbestos sheet page or ask our engineers for a cross-reference.
ModelKXT ARS
GradesKXB150 – KXB510
StandardGB/T 3985-2008
Max Temperatureup to +510 °C
Max Pressureup to 14 MPa
Thickness0.3 – 6.0 mm
Density1.6 – 2.0 g/cm³
MOQ500 kg (negotiable)
What Is an Asbestos Rubber Sheet?
An asbestos rubber sheet is a compressed fibre gasket material. Chrysotile asbestos fibre provides the heat resistance and mechanical reinforcement; the rubber binder (typically NBR, SBR or natural rubber) gives the sheet its flexibility, compressibility and resistance to water, steam and oils; heat-resistant fillers complete the formulation.
The sheet is produced in a controlled multi-stage process:
- Fibre opening — chrysotile asbestos fibre is opened and graded to a controlled fibre length.
- Mixing — fibre, rubber binder, fillers and vulcanising agents are blended into a uniform compound.
- Calendering — the compound is calendered into a continuous sheet of controlled thickness.
- Vulcanising & finishing — the sheet is vulcanised, trimmed and inspected for thickness, density and surface quality.
- Testing — tensile strength, compressibility, rebound, ageing and heat-and-pressure resistance are checked against GB/T 3985-2008.
Because the fibre-to-rubber ratio and filler type can be adjusted, the finished sheet can be tuned for higher temperature, higher pressure or better oil resistance. Tell us your medium, temperature and pressure and we will recommend the right grade.
Available Grades — KXB150 to KXB510
The KXT ARS family covers eight grades. Each grade is identified by its maximum recommended steam temperature; higher grades also deliver higher tensile strength and higher pressure capability.
| Grade | Max Temp. (Steam) | Max Pressure | Tensile Strength | Typical Service |
|---|---|---|---|---|
| KXB150 | +150 °C | 1.5 – 2 MPa | ≥ 5.0 MPa | Low-pressure water and air lines |
| KXB200 | +200 °C | 2 – 3 MPa | ≥ 6.0 MPa | Water, steam and general industrial flanges |
| KXB250 | +250 °C | 3 – 4 MPa | ≥ 8.0 MPa | Saturated steam and hot-water flanges |
| KXB300 | +300 °C | 4 – 5 MPa | ≥ 9.0 MPa | Medium-pressure steam lines |
| KXB350 | +350 °C | 7 – 8 MPa | ≥ 12.0 MPa | High-temperature steam and process piping |
| KXB400 | +400 °C | 8 – 9 MPa | ≥ 15.0 MPa | High-pressure steam headers and vessels |
| KXB450 | +450 °C | 11 – 12 MPa | ≥ 18.0 MPa | Superheated steam and power plant service |
| KXB510 | +510 °C | 13 – 14 MPa | ≥ 21.0 MPa | Highest-temperature steam and industrial sealing |
Heat-and-pressure resistance test: each grade must hold for 30 minutes at its rated temperature and pressure without puncture, per GB/T 3985-2008. Grades and values above are typical for the KXT ARS family; please request the current data sheet for exact limits.
Technical Specifications
| Property | Typical Value | Notes |
|---|---|---|
| Material | Chrysotile asbestos fibre + rubber binder + heat-resistant fillers | Grade-dependent |
| Standard | GB/T 3985-2008 | — |
| Colour | Dark grey, black or reddish-brown | Depends on grade and filler |
| Density | 1.6 – 2.0 g/cm³ | — |
| Tensile strength | 5.0 – 21.0 MPa | KXB150 → KXB510 |
| Ageing coefficient | ≥ 0.9 | — |
| Burning loss | ≤ 28 % (high grades) / ≤ 30 % (low grades) | — |
| Compressibility | 7 – 17 % | — |
| Rebound | 35 – 45 % | Grade-dependent |
| Creep relaxation | ≤ 50 % | — |
| Nitrogen leakage rate | ≤ 500 ml/(h·mm) | — |
| Max working temperature | +150 °C to +510 °C | By grade |
| Max working pressure | 1.5 – 14 MPa | By grade |
Values above are typical ranges for the KXT ARS family and are not a substitute for a specification sheet. Please request the current data sheet for the exact grade you require.
Standard Sheet Sizes
| Sheet Size (mm) | Thickness (mm) |
|---|---|
| 4600 × 1500 | 0.3 – 6.0 |
| 4100 × 1500 | 0.3 – 6.0 |
| 3800 × 2700 | 0.3 – 6.0 |
| 2000 × 1500 | 0.5 – 6.0 |
| 1500 × 1360 | 0.5 – 6.0 |
| 3810 × 1270 | 0.5 – 6.0 |
| 1270 × 1270 | 0.5 – 6.0 |
| 1500 × 1500 | 0.5 – 6.0 |
Other sizes and thicknesses are available on request, or can be produced to your drawing. Die-cut gaskets and strip-cut sheets are available.
Key Performance Advantages
Thermal performance
- Service temperature from +150 °C up to +510 °C depending on grade.
- Reliable in saturated and superheated steam service.
- Stable under long-term heat exposure thanks to the asbestos fibre structure.
Sealing performance
- Good compressibility (7–17 %) and rebound (35–45 %) for effective flange sealing.
- Low creep relaxation (≤ 50 %) helps hold bolt torque over time.
- Low nitrogen leakage rate (≤ 500 ml/(h·mm)) for tight sealing.
Mechanical properties
- High tensile strength — up to 21 MPa for KXB510.
- Good ageing coefficient (≥ 0.9) for long service life.
- Tough and easy to cut, punch and die-cut into gaskets.
Commercial advantages
- One of the most cost-effective sealing materials for steam and water service.
- Eight grades let you match price to actual duty instead of over-specifying.
- Wide stock range of sheet sizes and thicknesses for fast delivery.
Typical Applications
Asbestos rubber sheets are specified wherever a cost-effective, heat-resistant sealing material is required for low to high pressure flanges. Common applications include:
- Steam systems — saturated and superheated steam flanges, boiler manholes, turbine casings and steam headers.
- Water and air — low and medium pressure water lines, air ducts and compressed-air flanges.
- Oil and process fluids — oil-resistant grades for petroleum-based fluids and general process piping.
- Power generation — boiler, turbine and high-temperature steam service.
- Petrochemical and refinery — high-temperature piping and vessel flanges.
- General industry — vessel gaskets, heat exchanger gaskets and general die-cut sealing parts.
Supply Options & Custom Fabrication
We supply asbestos rubber sheets in the form that best fits your production line:
| Option | Available Range |
|---|---|
| Form | Full sheet, strip, roll, die-cut gasket, water-jet cut part |
| Sheet size | Up to 4600 × 1500 mm standard; custom sizes on request |
| Thickness | 0.3 – 6.0 mm (laminated to thicker build-ups on request) |
| Grade | KXB150, KXB200, KXB250, KXB300, KXB350, KXB400, KXB450, KXB510 |
| Reinforcement | Wire-net reinforced versions available for higher blow-out resistance |
| Surface | Smooth or graphite-coated |
| Branding | Neutral packing or your own label — OEM / ODM welcome |
Send us a drawing, a sample or simply the flange standard and we will quote the most economical cutting layout.
Need a price for asbestos rubber sheets today? Tell us grade, thickness, sheet size and quantity — our technical sales team replies within 2 business hours.
Why Buy Asbestos Rubber Sheets from Kaxite?
Ningbo Kaxite Sealing Materials Co., Ltd. is a China-based manufacturer and exporter of sealing materials, serving industrial distributors, OEMs and MRO buyers for more than a decade.
- Manufacturer, not just a trader — we control fibre opening, mixing, calendering, vulcanising and die-cutting in-house, which keeps quality consistent and lead times short.
- Application engineering support — our technical sales team reviews your medium, temperature and pressure before recommending a grade, so you do not over-specify or under-specify.
- Batch traceability — incoming fibre and rubber compounds are recorded, and finished sheets are checked for density, tensile strength, compressibility, rebound and ageing before packing.
- Third-party inspection welcome — SGS, BV, TÜV or your own nominated inspector can be arranged before shipment.
- Export experience — regular shipments to Europe, North America, the Middle East, Southeast Asia and South America, with export packing and documentation handled in-house.
- One-stop sourcing — as a full-range sealing supplier we also produce non-asbestos sheet, graphite sheet, PTFE sheet, rubber sheet, mica sheet and spiral wound gaskets, so you can consolidate orders.
Quality Control & Inspection
- Incoming raw material check on asbestos fibre grade and rubber compound.
- In-process control of mixing ratio, calendering thickness and vulcanising temperature.
- Finished goods inspection: density, tensile strength, compressibility, rebound, ageing coefficient and visual defect screening.
- Heat-and-pressure resistance test per grade, per GB/T 3985-2008.
- Pre-shipment sampling and retained counter-samples for traceability.
- Third-party test reports available on request against your specification.
Have a specific standard or acceptance criterion? Send it to us before ordering and we will confirm in writing whether the requested KXB grade can meet it.
Ordering, Packing & Delivery
| Item | Details |
|---|---|
| Minimum order quantity | 500 kg for standard grades (negotiable for trial orders and mixed containers) |
| Sample policy | Free A4-size samples for evaluation; buyer covers courier cost |
| Lead time | Typically 15 – 25 days after order confirmation; stock items ship faster |
| Packing | Sheets flat-packed on wooden pallets of about 1000 kg or 2000 kg net each, wrapped in film and strapped |
| Shipping | Sea, air or express; FOB Ningbo/Shanghai, CIF, DDP on request |
| Payment | T/T, L/C at sight, and other terms to be agreed |
| Documentation | Commercial invoice, packing list, bill of lading, certificate of origin, test report |
Lead times are indicative and confirmed per order.
Frequently Asked Questions
What is an asbestos rubber sheet used for?
Asbestos rubber sheets are used to cut flange gaskets, vessel gaskets and general industrial sealing parts. They are most commonly specified for steam, water, air, oil and non-oxidizing chemical service, where a cost-effective, heat-resistant compressed fibre gasket material is required.
Which grade should I choose — KXB150 to KXB510?
Choose the lowest grade that meets your maximum continuous steam temperature and working pressure. For example, KXB150 is suitable for low-pressure water and air lines up to +150 °C, while KXB510 handles superheated steam up to +510 °C and 14 MPa. Tell us your medium, temperature and pressure and our engineers will confirm the correct grade.
What is the difference between KXB and KNY grades?
KXB grades are the standard KXT ARS asbestos rubber sheets with good all-round performance for steam, water and general service. KNY grades are oil-resistant asbestos rubber sheets, formulated with a nitrile binder for better resistance to petroleum-based oils and fuels. If your application is mainly oil or fuel, ask for the KNY series.
What sheet sizes and thicknesses are available?
Standard sheet sizes range from 1270 × 1270 mm up to 4600 × 1500 mm, with thickness from 0.3 mm to 6.0 mm. Other sizes and thicknesses, including laminated thicker build-ups, can be produced on request. Die-cut gaskets and strip-cut sheets are also available.
Is asbestos rubber sheet legal in my country?
Asbestos is regulated in many countries, and import, sale or use of asbestos-containing products may be restricted or prohibited. Buyers are responsible for confirming that the product is permitted in their market. For markets where asbestos is restricted, Kaxite supplies equivalent non-asbestos jointing sheets (KNXB series) — please ask our engineers for a cross-reference.
Can you supply a non-asbestos alternative?
Yes. Our KNXB series non-asbestos jointing sheets are formulated with aramid fibre, glass fibre, carbon fibre and NBR/SBR binders to deliver comparable sealing performance without asbestos. Send us the KXB grade you are currently using and we will recommend the closest KNXB equivalent.
What is the MOQ and delivery time?
Standard MOQ is 500 kg, negotiable for trial orders or mixed containers. Production lead time is normally 15–25 days after order confirmation, and stock sizes can ship sooner.
Can I get a free sample before placing an order?
Yes. We provide free A4-size samples for evaluation; the buyer covers the courier cost, which can be deducted from the first order. Send us your grade, thickness and application details so we can send the most suitable material.
Send your specification — get a quotation and a free sample Include grade, thickness, sheet size, medium, temperature, pressure and annual quantity for the fastest response.
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