Performance Technical Parameters
Working range: -60°C to +260°C (continuous), short-term peak +310°C
PV value limits: Dry running ≤1.8MPa·m/s, water lubrication ≤2.5MPa·m/s, oil lubrication ≤3.5MPa·m/s
Max load capacity: Static ≤100MPa, dynamic ≤50MPa (pure PEEK), dynamic ≤75MPa (30% carbon fiber reinforced)
Max linear speed: ≤2.5m/s (dry running), ≤5m/s (lubricated)
Friction coefficient: Dry 0.12-0.18, water 0.08-0.12, oil 0.05-0.10
Wear rate: ≤5×10⁻⁶mm³/N·m (against steel, dry state), ≤2×10⁻⁶mm³/N·m (lubricated state)
Surface roughness: Inner bore Ra≤0.4μm, outer diameter Ra≤0.8μm
Dimensional tolerances: ID H7-H9 (+0.010~+0.040mm), OD h6-h8 (-0.010~-0.035mm), length ±0.050mm
Fit clearance: Radial clearance 0.05-0.20mm (determined by shaft diameter and load)
Hardness: Shore D 85-92 (pure), Shore D 95-100 (carbon fiber reinforced)
Compressive / Flexural: ≥130MPa / ≥170MPa
Linear expansion: 4.7×10⁻⁵/K (pure), 3.0×10⁻⁵/K (30% CF reinforced)
Water absorption rate: ≤0.5% (23°C, 24h immersion)
Sizes: Inner diameter Φ5-Φ200mm, outer diameter Φ8-Φ250mm, length 5-300mm, wall thickness 1.5-25mm.
Application Fields
As pump shaft support bushings, bearing radial loads and axial thrust. When conveying corrosive chemicals, PEEK resists strong acids and alkalis. In high-temp heat transfer oil pumps (180-220°C), inspection cycle exceeds 12,000 hours.
Used for cylinder piston rod guidance, buffers, and valve stem support. Withstands high-frequency reciprocating motion (>10⁸ times), wear amount only 1/5 of bronze. Self-lubricating in oil-free pneumatic systems.
Complies with FDA 21 CFR 177.2415 and EU 10/2011 food contact regulations. Withstands CIP cleaning (80°C alkaline) and SIP sterilization (121°C steam). No metal ion precipitation, meeting GMP and HACCP.
Applied in wafer transfer manipulators, CMP equipment, and vacuum pumps. Maintains chemical inertness in ultra-pure water, etching solutions, and photoresists. Particle precipitation <1ppb, meeting Class 10 cleanliness standards.
Used in EPS worm gear bushings, transmission shift fork bushings, and seat adjustment mechanisms. Maintains stable performance from -40°C to +150°C, reduces NVH, and cuts weight by 30-50%.
Applied in high-speed roller bearings, yarn guides, and tension control devices. Long-term operation at 2000-4000rpm. Resistant to dye and solvent corrosion, maintenance intervals extended to >3 times that of traditional bushings.
Common Failure Causes and Remedial Measures
Causes: Fit clearance too small (<0.05mm); Shaft roughness >Ra1.0μm; PV value exceeding limit; Foreign particles (>HV 800); Insufficient lubrication.
Remedies: Increase radial clearance to 0.10-0.15mm; Polish shaft surface to Ra0.4-0.8μm; Recalculate PV value and reduce load/speed. Install filtration device (<25μm). Select compatible greases.
Causes: Thermal expansion error; Shaft bending/misalignment (>0.10mm); Assembly interference too large (>0.05mm); Lubrication film not established during cold start; Burrs in bore.
Remedies: Compensate clearance according to working temp (add 0.05-0.10mm per 100°C); Check shaft straightness; Control press-fit interference (0.01-0.03mm); Preheat or run at low speed for 200 revs.
Causes: Impact load exceeding strength limit; Stress concentration (sharp corners); Sudden temperature change (>100°C/min); Wall thickness too thin (<1.5mm); Material defects.
Remedies: Add buffering/shock absorption; Optimize structural design (fillets R≥2mm); Control heating/cooling rate ≤50°C/h; Increase wall thickness to 3-5mm or adopt glass fiber reinforced PEEK.
Causes: Moisture absorption expansion (0.1-0.3%); Creep deformation (plastic flow under long-term high load); Non-uniform thermal expansion; Press-fit stress release.
Remedies: Pre-soak in boiling water for 24 hours for water environments; Reduce working stress below 50% of yield strength; Select 30% CF reinforced PEEK for high temp; Perform stress relief treatment (150°C for 2 hours).
Procurement Selection Essential Parameters
When ordering, purchasing engineers must provide:
- Bushing installation location and working mode (rotating/reciprocating/oscillating).
- Bushing dimensions (inner diameter × outer diameter × length) and tolerance requirements.
- Mating shaft diameter, surface hardness (required ≥HRC 45) and roughness (recommended Ra0.6-0.8μm).
- Working load (radial force, axial force), speed or reciprocating frequency.
- Working environment (temperature range, media type, pH value, presence of lubrication).
- Expected service life and maintenance cycle.
Selection conditions: Mating shaft surface requires hardening or nitriding treatment, hardness ≥HRC 45 (recommended ≥HRC 55), roughness Ra≤0.8μm. PV value must be within material capacity range. For high-speed (>1500rpm), heavy-load (>20MPa) or high-temperature (>150°C) conditions, detailed parameters must be provided. Our engineers will provide selection plans and CAD models within 24 hours.
FAQ
Q1: What advantages does PEEK bushing have compared to bronze bushing?
Self-lubricating (friction coefficient 0.08-0.15), high corrosion resistance, excellent wear resistance (service life extended 3-5 times), lightweight (15% of bronze), low noise, maintenance-free, food-grade compliant, and excellent insulation properties.
Q2: How to determine bushing and shaft fit clearance?
Reference empirical formula: radial clearance = 0.001 × shaft diameter (mm) + correction amount. Correction factors include high speed (>1500rpm), high temperature (>100°C), heavy load, reciprocating motion, and dry running. Practical application varies from light load low speed (0.05-0.10mm) to heavy load high speed (0.15-0.25mm).
Q3: Can PEEK bushing work under non-lubricated conditions?
Yes, but with limitations dependent on PV value. Pure PEEK dry running PV≤1.8MPa·m/s. Adding solid lubricants (PTFE, graphite, MoS2) increases PV to 2.5MPa·m/s. 30% carbon fiber + 15% PTFE composite reaches 3.0MPa·m/s. Exceeding limits causes rapid friction heat accumulation and failure.
Q4: How to install PEEK bushing?
Three methods: Press-fit method (interference 0.01-0.03mm, use MoS2), Cold installation method (liquid nitrogen at -196°C or dry ice at -78°C for 5-10 mins), and Hot installation method (heat housing to 80-100°C). Check concentricity and face runout after installation.
Q5: How to choose between pure PEEK and reinforced PEEK bushing?
Pure PEEK: good toughness, low friction (0.08-0.12), ideal for light load/low speed. 30% CF reinforced: higher hardness, load capacity increased 50%, thermal expansion reduced 35%, suitable for high speed/temp. 15% PTFE + CF composite: lowest friction and high strength. 10-15% GF reinforced: optimal cost-performance ratio.
Q6: What is the service life of PEEK bushing?
Depends on wear rate and limit. Wear limit is usually 20-30% of wall thickness. Typical life: Clean water reciprocating (PV=1.5) 25,000-40,000 hrs; Hydraulic cylinder (PV=2.0) 10,000-15,000 hrs; Dry running pneumatic (PV=1.0) 5,000-8,000 hrs. Monitor internal diameter for replacement.
Q7: Can PEEK bushing withstand impact loads?
Has certain impact resistance, but not as good as metal. Pure PEEK (impact strength 85kJ/m²) is suitable for frequent start-stop. CF reinforced has reduced impact strength due to brittleness. For heavy impacts, recommend using metal bushings or composite bushings (metal outer layer + PEEK inner lining).
Q8: What should be noted when PEEK bushing mates with stainless steel shaft?
Hardness matching (shaft requires HRC 50-60 to avoid reverse wear), Surface treatment (nitriding/chrome plating), Roughness control (Ra0.4-0.8μm), Corrosion prevention (avoid galvanic corrosion in seawater), and Thermal expansion difference (PEEK expands 2.8 times more than stainless steel).
About Dalian Allstar Material
Dalian Allstar Material is a professional enterprise focusing on PEEK and PI high-performance polymer research, development, and manufacturing. The company has a complete material modification, precision machining and quality inspection system, equipped with Swiss imported CNC machining centers, coordinate measuring machines and friction wear testing equipment.
Professionally provides customized solutions for various bushings, sleeves and sliding bearings, with products widely applied in pumps and valves, hydraulic and pneumatic, food and pharmaceuticals, semiconductors, automotive and other fields, helping customers reduce maintenance costs and improve equipment reliability.