For seals, wipers and guides in hydraulic cylinders, rotating shafts, bearings, dust protection systems and slurry equipment. Select materials by fluid, pressure, temperature, speed, motion, groove geometry and surface condition.
Elastomers provide resilience and contact pressure. Polyurethane offers wear and extrusion resistance in selected dynamic hydraulic seals. PTFE and its composites provide low friction and chemical compatibility, while engineering plastics are often used for guide rings, wear rings and supports. Select the material together with the seal type and complete groove design.
Group parts by function, then select materials for the fluid and operating conditions.
Seals and guides form a system. Check grooves, clearances and rod surface damage when replacing a seal.
Speed, shaft diameter, runout and inadequate lubrication can rapidly change material performance.
Slurry pump wet-end linings and seals have different functions. A rubber lining compound is not automatically suitable for a shaft seal.
After selecting a material family, define temperature limits and service life targets for the specific operating conditions.
| Material Family | Key Properties | Typical Parts | Selection Limits |
|---|---|---|---|
| NBR Nitrile Rubber | A balance of elasticity, sealing and wear resistance in common oil applications. | O-rings, static seals, selected shaft seals and conventional hydraulic seals. | Oil type, low and high temperatures, ozone and the specific compound; the NBR designation alone does not establish suitability. |
| HNBR Hydrogenated Nitrile Rubber | Greater resistance than conventional NBR to selected thermal, mechanical and environmental ageing conditions. | Heavy-duty hydraulic seals, dynamic seals and more demanding oil applications. | Check fluid compatibility, temperature, pressure cycling and compound certification. |
| FKM Fluoroelastomer | Stable sealing in selected high-temperature, oil and chemical applications. | High-temperature oil seals, static seals and secondary seals for special fluids. | Low temperatures, steam and amines may limit suitability; consult the compound compatibility data. |
| PU Polyurethane | Wear, tear and extrusion resistance for selected reciprocating hydraulic seals. | Piston and rod seals, wipers, buffer seals and wear rings. | Hydrolysis, temperature, fluid compatibility and friction at high speed; seal PU compounds differ from mining liner PU compounds. |
| PTFE and Composites | Low friction, broad chemical compatibility and low adhesion; fillers can modify load capacity and wear performance. | Sliding rings, rotary and reciprocating seals, guide rings, wear rings and mechanical seal secondary parts. | Resilience, cold flow, creep, mating surfaces and preload design; often used in combination with an elastomer. |
| Engineering Plastics / Composite Guide Materials | Support, guidance, low friction, seizure resistance and dimensional stability. | Guide rings, support rings, wear rings, and insulating or low-friction separators. | Bearing pressure and speed, temperature, water absorption, creep, lubrication and clearance. |
Small seals can have a major effect on equipment downtime.
Record the material family, compound or grade, batch and certificate; colour is not a reliable material identifier.
Check cross-section, bore and outside diameter, lips, flash, nicks, surfaces and deformation caused by packaging.
Check groove dimensions, extrusion gaps, shaft or cylinder surfaces, chamfers and assembly orientation.
Assess compatibility and perform necessary bench or trial-fit testing for the fluid, pressure, temperature and motion.
Use the part pages to check OEM drawing numbers, spare part numbers, installation positions and applicable models.
Technical References: Trelleborg Sealing Solutions distinguishes NBR, HNBR, FKM, polyurethane and other elastomers, and explains how materials interact with fluids, temperatures and seal designs. The final grade and application limits depend on complete operating conditions, customer drawings and supplier material data.
Please provide the equipment model, OEM drawing number, seal type, fluid, pressure, temperature, speed, shaft or bore diameter, groove dimensions, current material, failure photographs and quantity.
Consultation, supplier coordination, quality control and finished part delivery for custom parts, wear parts and industrial spares worldwide.
Identify parts, review drawings and operating conditions, and assess material options.
Match Chinese manufacturing resources to the technical requirements.
Track materials, machining, inspection and acceptance.
Arrange manufacturing, packaging and complete finished-part delivery.
Send the model, drawing, part number, material or operating conditions so we can define the technical review and supply process.
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