Nomex Fiber Packing with Rubber Core
Model:KXT P305
Kaxite KXT P305 Nomex Fiber Packing with Rubber Core combines a Nomex (aramid) braided outer layer with a high-elastic rubber core that absorbs vibration and maintains sealing contact. Ideal for abrasive slurries, sand and vibrating pumps — rated −100 °C to +280 °C, pH 2–12 and shaft speeds up to 20 m/s.
Kaxite KXT P305 Nomex Fiber Packing with Rubber Core is a high-performance braided gland packing built from Nomex (aramid) fiber over a high-elastic rubber core. The rubber core — normally silicone rubber, but available in other elastomers on request — absorbs vibration and shaft movement, keeping the packing in continuous contact with the shaft and controlling leakage far more effectively than solid braided packings. Combined with Nomex's outstanding abrasion resistance, high temperature tolerance and mechanical strength, this packing is the ideal choice for abrasive slurries, gritty media, sand, water, steam, solvents and oils in the mining, chemical, pulp & paper, and general process industries.
Nomex Fiber Packing with Rubber Core at a Glance
| Product Name | Nomex Fiber Packing with Rubber Core |
| Kaxite Model | KXT P305 |
| Outer Material | Nomex (aramid) fiber, braided |
| Core Material | High-elastic rubber core — normally silicone rubber; other elastomers available on request |
| Construction | Square braid, diagonal braid or interlock braid; rubber core running through the center |
| Color | Natural Nomex yellow / golden (with a visible core end) |
| Temperature Range | −100 °C to +280 °C |
| Pressure Rating | Rotary pump 25 bar / Reciprocating pump 50 bar / Static sealing 100 bar |
| Shaft Speed | Up to 20 m/s |
| Density | 1.3 g/cm³ |
| pH Range | 2–12 |
| Origin | Made in China — manufactured in Kaxite's own factory in Ningbo, Zhejiang |
What Is Nomex Fiber Packing with Rubber Core?
Nomex Fiber Packing with Rubber Core is a dual-material braided gland packing. It combines two components that each deliver a specific function:
- Outer layer — Nomex (aramid) fiber. Nomex is a heat-resistant synthetic aramid fiber with outstanding abrasion resistance, tensile strength and thermal stability. It is the same class of fiber used in firefighter protective clothing, aerospace components and heavy-duty industrial textiles. In braided packing, Nomex provides the mechanical strength and wear resistance that keep the packing in service even against abrasive slurries.
- Inner core — high-elastic rubber. Running through the center of the braid is a cord of high-elastic rubber — normally silicone rubber, which combines excellent elasticity with a wide temperature range. This rubber core absorbs vibration and small shaft movements, keeping the packing in continuous contact with the shaft surface. This is critical in vibrating equipment, where a solid packing would quickly develop gaps and start leaking.
The two components work together. The Nomex outer layer resists abrasion and heat; the rubber core maintains sealing pressure and absorbs vibration. The result is a packing that seals more reliably, lasts longer and is more forgiving of imperfect shaft conditions than a single-material braided packing.
In everyday purchasing language, this product is also searched as Nomex packing with rubber core, aramid packing with rubber core, vibration-absorbing gland packing or slurry pump packing. All of them refer to the same product family covered by Kaxite model KXT P305.
Key Features and Performance Benefits
Rubber Core Absorbs Vibration
The elastic core keeps the packing in constant contact with the shaft, absorbing vibration and small movements — dramatically reducing leakage in vibrating equipment.
Extreme Abrasion Resistance
Nomex (aramid) fiber is one of the most abrasion-resistant synthetic fibers available — the correct choice for abrasive slurry, sand and gritty media.
Gentle to the Shaft
Despite its abrasion resistance, the Nomex braid is designed to be gentle on the shaft surface — reducing shaft wear and extending equipment life.
High Temperature Resistance
Serviceable from −100 °C to +280 °C — covering cryogenic service, steam and hot process fluids.
Broad Chemical Resistance
Resistant to most chemicals across pH 2–12 — suitable for water, steam, solvents, oils, many process fluids and mild chemicals.
High Shaft Speed Capability
Rated up to 20 m/s — among the highest shaft speeds for a braided packing, thanks to the combination of low-friction Nomex braid and vibration-absorbing core.
Configurable Core Material
Standard core is silicone rubber, but the core can be changed to other elastomers (e.g. EPDM, NBR, FKM) to match your process media and temperature.
Clean and Easy to Install
No messy lubricants or graphited surfaces — clean to handle, easy to cut to length and install as individual rings in the stuffing box.
Technical Data of Nomex Fiber Packing with Rubber Core
The table below shows typical values for Kaxite KXT P305 Nomex Fiber Packing with Rubber Core. Standard cross-sections are square; other profiles, sizes and core materials are available on request.
| Property | Value |
|---|---|
| Outer material | Nomex (aramid) fiber, braided |
| Core material | High-elastic rubber — standard silicone rubber; other elastomers on request |
| Color | Natural Nomex yellow / golden |
| Density | 1.3 g/cm³ |
| Temperature range | −100 °C to +280 °C |
| pH range | 2–12 |
| Pressure — rotary pump | 25 bar |
| Pressure — reciprocating pump | 50 bar |
| Pressure — static sealing | 100 bar |
| Rotary speed | Up to 20 m/s |
| Cross-sections available | Standard square sizes on request; custom sizes available |
Available Variations of KXT P305
The KXT P305 series can be supplied with different braiding styles and different core materials, so that the packing can be tuned to the specific operating conditions of your equipment.
| Variant | Braid Style | Core Material | Typical Use |
|---|---|---|---|
| KXT P305 (standard) | Square braid | Silicone rubber | General slurry, water and mild chemical service |
| KXT P305-D | Diagonal braid | Silicone rubber | Higher-pressure and higher-speed service |
| KXT P305-I | Interlock braid | Silicone rubber | High-speed rotary pumps and demanding dynamic service |
| KXT P305-EPDM | Square braid | EPDM rubber | Hot water, steam and weather-resistant service |
| KXT P305-NBR | Square braid | Nitrile rubber | Oil and petroleum-based media |
| KXT P305-FKM | Square braid | FKM (Viton-type) rubber | High-temperature and aggressive chemical service |
Note: The core material can be changed to meet your process media and temperature requirements. If your application involves a specific chemical or a temperature outside the standard silicone range, tell us at the time of inquiry and we will recommend the best core elastomer.
Typical Applications
- Abrasive slurries — pumps handling sand, ore slurry, cement slurry and other gritty media in the mining industry.
- Water handling equipment — centrifugal and rotary pumps in water supply, wastewater and utility systems.
- Steam service — valve stems, pump shafts and glands exposed to saturated or superheated steam.
- Solvent handling — pumps and valves for solvents, thinners and other organic fluids (depending on core material).
- Oil and petroleum service — with NBR core option for pumps handling oils, diesel and petroleum-based fluids.
- Pulp and paper industry — stock pumps, refiners and process equipment handling fiber slurries.
- Chemical industry — pumps and valves handling mild acids, alkalis and process fluids within pH 2–12.
- Food processing — pumps and mixers handling food slurries and process water (with suitable food-grade core).
- Vibrating equipment — any rotating equipment with significant vibration, where conventional braided packing would quickly leak.
- General industrial sealing — wherever a durable, abrasion-resistant, vibration-absorbing packing is required.
Related packing products: Aramid Fiber Packing, Nomex Fiber Packing, Spun Kevlar Packing, Graphite PTFE and Aramid Fiber in Zebra Braided Packing, Graphite PTFE Packing with Aramid Fiber Corners.
How to Choose the Right Nomex Packing with Rubber Core
Selecting the correct braid style, cross-section size and core material is the difference between a long-lasting seal and premature failure. Use the guidance below, or send us your service conditions and our engineers will recommend a specification.
1. Confirm Abrasive or Vibrating Service
- Abrasive slurry, sand, grit — KXT P305 is the correct choice.
- Vibrating equipment — the rubber core makes this packing far superior to solid braids.
- Clean, non-abrasive media — a standard packing may be more economical.
2. Choose the Core Material
- Silicone rubber — standard; wide temperature range, good general chemical resistance.
- EPDM — better for hot water, steam and weather-resistant service.
- NBR — better for oils and petroleum-based media.
- FKM — better for high-temperature and aggressive chemical service.
3. Check the Operating Conditions
- Pressure: rotary 25 bar / reciprocating 50 bar / static 100 bar.
- Speed: up to 20 m/s for rotary service.
- Temperature: −100 °C to +280 °C.
- pH: 2–12.
4. Choose the Cross-Section Size
- Measure the stuffing box cross-section (width × depth) — the packing size should match.
- Standard square sizes and custom sizes are available on request.
Rule of thumb: whenever the process fluid is abrasive (sand, slurry, grit) or the equipment vibrates noticeably, Nomex Fiber Packing with Rubber Core is almost always the right first choice. For non-abrasive, low-vibration service, a standard Nomex packing or an aramid fiber packing may be a more economical alternative.
Why Nomex Fiber Packing with Rubber Core?
Compared with a single-material braided packing, the dual-material construction of KXT P305 offers clear trade-offs. The table below summarises the practical differences.
| Consideration | Nomex with Rubber Core (KXT P305) | Standard Braided Packing |
|---|---|---|
| Vibration absorption | Excellent — rubber core absorbs vibration | Poor — solid braid transmits vibration |
| Sealing on vibrating equipment | Excellent — continuous contact is maintained | Poor — gaps develop quickly |
| Abrasion resistance | Excellent — Nomex outer resists wear | Depends on material — often lower |
| Shaft speed capability | Up to 20 m/s | Varies — often 10–12 m/s |
| Temperature range | −100 °C to +280 °C | Depends on material — often narrower |
| Chemical resistance | pH 2–12 (core-dependent) | Material-dependent |
| Installation | Clean, easy — cut to length, standard rings | Clean, easy — cut to length, standard rings |
Quality Assurance
Every batch of Kaxite Nomex Fiber Packing with Rubber Core is produced and released under a documented quality control procedure:
- Incoming inspection — Nomex yarn and rubber core material are verified for grade, purity and physical properties before braiding.
- In-process control — braiding density, cross-section dimensions, core position and braid style are monitored throughout production.
- Finished goods testing — density, cross-section tolerance, temperature rating, pH resistance and core concentricity are verified against specification.
- Batch traceability — each spool, coil or carton carries a batch number traceable back to the raw material lot.
- Third-party testing — SGS, TÜV or other nominated laboratories can be arranged at the buyer's request.
Inspection certificates and material test reports are issued with every shipment. If your project requires a specific standard or an approved-vendor audit, please contact us before ordering so that we can prepare the documentation in advance.
Packing, Delivery and Ordering Information
| Packaging | Supplied in coils, spools or cartons as agreed with the customer. Each unit sealed and labelled with product name, model, cross-section, batch number and net weight. |
| Standard pack sizes | Standard coil weights and pack sizes — please state your preferred pack format when ordering. |
| Marking | Product name, model, cross-section, braid style, core material, batch number and quantity on each package. |
| Production lead time | Typically 7–15 working days for standard specifications after order confirmation; shorter for stock items. |
| Shipping terms | FOB Ningbo / Shanghai, CIF, CFR, DDP and express delivery are all available. |
| Customisation | Custom cross-sections, braid styles, core materials, pre-formed rings and private-label packing. |
Please include the following information in your inquiry so that we can quote accurately the first time: cross-section size, quantity, application equipment, process media, working temperature, pressure and shaft speed. If you have a preferred core material, please specify it — otherwise our engineers will recommend the best one for your process conditions.
Why Buy Nomex Fiber Packing with Rubber Core from Kaxite
- We are the manufacturer, not a trader. Our Nomex braiding, rubber core extrusion and finished packing all take place in our own facility in Ningbo, Zhejiang, China — so you get factory pricing and direct technical support.
- Full packing range under one roof. Beyond this product we manufacture aramid fiber packing, Nomex fiber packing, PTFE packing, graphite packing and gaskets, so you can consolidate your sealing sourcing with one qualified supplier.
- Technical sales, not order-taking. Our team answers application questions — braid style, core material selection, size recommendation, temperature and pressure limits — and will tell you honestly when a different packing would serve you better or more economically.
- Fast response. Inquiries are normally answered within 2 business hours during working days.
- Consistent export experience. Products are shipped worldwide with complete export documentation and packing suitable for long sea transport.
- Flexible order sizes. Both trial quantities and repeat container loads are welcome.
Frequently Asked Questions
What is Nomex Fiber Packing with Rubber Core used for?
It is used for gland sealing of pumps, valves and other rotating equipment in demanding service — particularly where the process fluid is abrasive (sand, slurry, grit) or where the equipment vibrates noticeably. The Nomex outer layer resists abrasion, while the rubber core absorbs vibration and maintains sealing contact. Typical industries are mining, pulp and paper, water treatment, chemical processing and general industrial sealing.
Why is a rubber core used?
The rubber core is the key differentiator of this product. Standard braided packings are solid — when the shaft vibrates or moves slightly, the packing loses contact and leaks. The high-elastic rubber core absorbs that vibration, keeping the packing in continuous contact with the shaft surface. This makes the packing dramatically more reliable on vibrating equipment and provides a better, more stable seal over time.
What is the temperature range of this packing?
The standard product with silicone rubber core is rated from −100 °C to +280 °C. If your application requires service outside this range, or if your process media is incompatible with silicone, we can supply alternative core materials — EPDM, NBR or FKM — to match your conditions. Please specify your media and temperature at the time of inquiry.
What chemicals is this packing suitable for?
The standard silicone-cored product is suitable for service across pH 2–12 — most process fluids, water, steam, solvents and mild chemicals. For petroleum-based fluids, choose the NBR-cored variant. For high-temperature or aggressive chemical service, choose the FKM-cored variant. Send us your specific media and conditions and we will recommend the correct core material.
Is this packing gentle on the shaft?
Yes — one of the key features of the Nomex braid is that although it is extremely abrasion-resistant, it is also designed to be gentle on the shaft surface. This reduces shaft wear and extends both packing and shaft life. Combined with the vibration-absorbing rubber core, the packing is much more forgiving of imperfect shaft conditions than a conventional solid braid.
What cross-section sizes do you supply?
Standard square cross-sections are available on request, and custom sizes can be produced. Please measure your stuffing box cross-section (width × depth) and the shaft diameter, and send us the details — our engineers will confirm the correct size.
Can you supply pre-formed die-formed rings?
Yes. We can supply this packing as pre-formed rings sized to your shaft diameter and stuffing box dimensions. Pre-formed rings save installation time, ensure a proper fit and reduce the risk of installation error on site.
What is the minimum order quantity and lead time?
We accept both trial orders and full container loads. Lead time is typically 7–15 working days for standard specifications after order confirmation. Please send your requirement and we will confirm the exact MOQ and delivery schedule for your specification.
Are you a manufacturer or a trading company?
Kaxite is a manufacturer. Ningbo Kaxite Sealing Materials Co., Ltd. operates its own production facility at No. 432 Zhenhai Middle Road, Luotuo Street, Zhenhai District, Ningbo City, Zhejiang, China, where the Nomex Fiber Packing with Rubber Core is braided, core-inserted, finished and packed.
Ready to specify your Nomex Fiber Packing with Rubber Core?
Send us your cross-section size, quantity and working conditions (media, temperature, pressure, shaft speed) — our technical sales team will reply within 2 business hours with a quotation and a recommended specification.
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No. 432 Zhenhai Middle Road, Luotuo Street, Zhenhai District, Ningbo City, Zhejiang China
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