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NBR EPDM FKM Back Up Ring & Rubber Washer Manufacturer - Topseals

NBR EPDM FKM Back Up Ring & Rubber Washer | Custom Seals Manufacturer Topseals

Product Introduction

Topseals is a professional rubber plastic sealing parts factory, supplying high-performance PTFE back up rings and NBR/EPDM/FKM rubber washers for hydraulic, pneumatic and mechanical sealing systems.

Combined back up ring and rubber washer assembly prevents seal extrusion under high pressure, eliminates leakage and extends the service life of sealing components. Standard and custom sizes are supported with strict quality inspection for heavy industrial use.

Material Options for Rubber Washers & PTFE Back Up Rings

NBR Rubber Washer

Excellent oil and wear resistance, cost-effective. Working temperature: -30℃ ~ 120℃. Ideal for hydraulic oil, engine oil and general machinery.
EPDM Rubber Washer

Superior weather, aging, water and steam resistance, acid & alkali proof. Working temperature: -40℃ ~ 150℃. Suitable for water pipelines, outdoor equipment and cooling systems.
FKM Rubber Washer

Outstanding high temperature and chemical corrosion resistance, resistant to solvents, gasoline, acid and alkali. Working temperature: -20℃ ~ 250℃. Perfect for auto engines and chemical equipment.

We supply modified PTFE back up rings matched with above rubber washers, including carbon-filled and glass-filled PTFE for enhanced compression and wear resistance.

Three Main Types of PTFE Back Up Rings

Solid Back Up Ring

Integral one-piece design, best anti-extrusion performance for static high-pressure sealing.
Split Back Up Ring

Single-side cut design, easy to install without full equipment disassembly, fit for dynamic shaft sealing.
Spiral Back Up Ring

Continuous spiral structure, ultra-high pressure resistance and good flexibility, widely used in heavy-duty hydraulic cylinders.

Core Advantages of Topseals Sealing Products

Direct factory supply without middlemen, competitive bulk wholesale price.
Complete material portfolio: NBR/EPDM/FKM rubber washers + solid/split/spiral PTFE back up rings.
Full OEM & ODM customization: custom size, thickness, hardness, color, logo and mold opening for non-standard parts.
Reliable high-pressure sealing performance, effectively avoid rubber washer extrusion damage.
Strict QC: raw material inspection, compression set, aging and dimensional tolerance testing for every batch.
Wide size range: standard metric sizes M2-M42, custom small/large sizes available per drawings or samples.

Wide Application Range

Hydraulic & pneumatic equipment: cylinders, valves, pumps, pipe fittings
Automotive parts: engine sealing, fuel and brake systems
Chemical industry: corrosion-resistant pipelines and reaction vessels
Water treatment & sanitary equipment: valves, flanges, steam devices
Heavy construction machinery: excavators, loaders, high-pressure sealing assemblies
General hardware: bolt sealing washers and flange gaskets

Custom Manufacturing Service

As an original sealing parts manufacturer, Topseals provides one-stop custom service for back up rings and rubber washers:

Free sample support for performance testing before mass orders.
Independent mold workshop for fast custom molds based on customer drawings or samples.
Adjustable rubber hardness Shore A 30~90 to meet different compression requirements.
Optional surface treatment for PTFE back up rings, anti-adhesion coating available.
Custom export packaging and private brand labels for sea & air shipment.

Technical Specifications

Rubber Washer Sizes: Standard metric M2 to M42, custom ID/OD/thickness on request.
Back Up Ring Types: Solid, single split, spiral wound PTFE.
Rubber Hardness: Shore A 40 ~ 85 adjustable for NBR/EPDM/FKM.
Pressure Resistance: Matched PTFE back up rings support working pressure up to 70MPa.
Dimensional Standard: Compliant with GB and ISO sealing tolerance standards.

FAQ

Q1: What is the function of PTFE back up ring matched with rubber washer?

The PTFE back up ring fills the extrusion gap of seal grooves, stopping NBR/EPDM/FKM rubber washers from being squeezed out under high hydraulic pressure, reducing leakage and prolonging service life.

Q2: How to select NBR, EPDM or FKM rubber washers?

NBR: Oil & lubricant media, normal temperature working conditions
EPDM: Water, steam, outdoor weather and weak acid/alkali environments
FKM: High temperature, strong solvents, gasoline and harsh chemical conditions

Q3: What back up ring styles do you produce?

We manufacture solid, single split and spiral wound PTFE back up rings, compatible with all our NBR/EPDM/FKM rubber washers.

Q4: Do you support OEM custom washers and back up rings?

Yes, we are a direct sealing factory offering full OEM & ODM customization. Custom sizes, hardness and materials are available; we can open new molds according to drawings or samples, and provide free test samples.

Q5: What standard sizes of rubber washers are available?

Our standard metric rubber washers cover M2 to M42, non-standard extra-small or large sizes can be customized as required.

Q6: Are these assemblies suitable for hydraulic cylinder high-pressure sealing?

Absolutely. Our PTFE back up rings withstand pressure up to 70MPa. Combined with high-quality NBR/EPDM/FKM rubber washers, they are widely used in heavy-duty hydraulic cylinder sealing assemblies.

Contact US

If you need standard or customized NBR EPDM FKM rubber washers and PTFE back up rings, send us your size drawings, working medium, temperature and pressure requirements. Our professional engineering team will provide cost-effective sealing solutions with factory-direct wholesale prices and fast delivery. Global machinery manufacturers, engineering equipment buyers and distributors are welcome to contact us for quotations and samples.

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Topseals