PTFE-lined bushings are self-lubricating bearings featuring a PTFE sliding layer bonded to a metal substrate. As a specialist manufacturer of PTFE products, Taifno offers this reliable solution—which is self-lubricating, maintenance-free, and corrosion-resistant—as an alternative to metal bearings.
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Problem |
Consequences |
How PTFE-Lined Bushings Solve the Problem |
|
Severe wear of metal bearings under oil-free or low-oil conditions |
Frequent replacement, equipment downtime |
Self-lubricating PTFE liner; requires no external lubrication and allows for long-term operation under oil-free conditions. |
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Corrosion of metal bearings by strong acids, alkalis, or solvents |
Bearing failure, equipment damage |
PTFE liner offers excellent chemical resistance, suitable for a pH range of 0–14. |
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Stick-slip behavior of metal bearings under heavy, low-speed loads |
Unstable operation, high noise levels |
PTFE liner features a low friction coefficient (0.02–0.15) and eliminates stick-slip phenomena. |
|
Bearing seizure due to thermal expansion or contraction under extreme temperatures |
Equipment failure, production shutdown |
Complies with the AS81934 standard (-65°F to +325°F); custom solutions are available for wider temperature ranges (-200°C to +260°C). |
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Product Form |
Description |
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Straight Bushing |
Standard cylindrical bushing for radial loads |
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Flanged Bushing |
Flanged bushing for radial and axial loads |
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Thrust Washer |
Flat washer for axial loads |
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Custom Shape |
Custom-made according to drawings |
✅ Self-lubricating: No external lubrication required; maintenance-free operation
✅ Low friction: Friction coefficient of 0.02–0.15; no stick-slip
✅ High load capacity: Static load capacity up to 482 N/mm²
✅ Corrosion resistance: PTFE liner offers chemical resistance across pH 0–14
✅ Temperature resistance: Meets AS81934 standards (-65°F to +325°F); custom wide-range options (-200°C to +260°C) available upon request
✅ Long service life: PTFE fabric-lined bushings offer 7–10 times the service life of conventional bronze-sintered PTFE bearings
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Comparison Item |
PTFE Bushing |
PTFE-Lined Bushing |
|
Structure |
Solid sleeve (pure or filled PTFE) |
Metal substrate + PTFE composite layer |
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Wall Thickness |
Thick (mm to cm range) |
Thin-wall (0.5–2.7 mm) |
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Load Capacity |
Low to medium |
High (static load 482 N/mm²) |
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Best For |
Light-to-medium loads, corrosive environments, clean operating conditions |
Heavy-duty/low-speed, aerospace, construction machinery |
|
Corrosion Resistance |
★★★★★ (Solid PTFE) |
★★★★★ (PTFE sliding layer) |
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Installation Method |
Press-fit |
Press-fit |
|
Typical Industries |
Chemical, food, and pharmaceutical industries |
Aerospace, construction machinery, heavy-duty equipment |
Quick Decision:
Need high load capacity + self-lubricating + aerospace standard compliant → Choose PTFE Lined Bushing
Need overall chemical resistance + light-medium load + clean service → Choose PTFE Bushing
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Comparison Items |
Metal Bearing |
PTFE-Lined Bushing |
Customer Value |
|
Lubrication Method |
Requires regular greasing |
Self-lubricating; requires no external lubrication |
Saves on lubricant costs and maintenance time |
|
Coefficient of Friction |
0.10–0.50 (requires lubrication) |
0.02–0.15 (self-lubricating) |
Lower operating resistance; energy-efficient |
|
Corrosion Resistance |
★★☆☆☆ Rusts easily |
★★★★★ Corrosion-resistant PTFE lining |
Suitable for humid and corrosive environments |
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Stick-Slip Phenomenon |
Significant at low speeds and high loads |
No stick-slip |
Smoother operation |
|
Service Life |
Baseline |
7–10x |
Significantly extended service life |
|
Maintenance Frequency |
Regular lubrication (monthly or quarterly) |
Maintenance-free |
Substantially reduced maintenance costs |
|
Best For |
Heavy load, high speed (with lubrication) |
Oil-free/low-lube; heavy-load, low-speed; corrosive environments |
— |
|
Structural Layer |
Material |
Thickness |
Function |
|
Sliding Layer |
PTFE + Fiber mixture |
0.01–0.03 mm |
Low friction, self-lubricating, initial transfer film |
|
Middle Layer |
Sintered Bronze Powder |
0.20–0.35 mm |
Heat dissipation, load support, PTFE reservoir |
|
Backing Layer |
Low Carbon Steel |
0.50–2.7 mm |
High load capacity, structural strength |
PTFE Fabric Liner Construction:
PTFE fabric-lined bushings use woven PTFE fibers integrated with phenolic resin, offering higher tensile strength (270MPa) and load capacity, suitable for aerospace and heavy-load applications.
|
Parameter |
Typical Value |
Notes / Note |
|
Material |
Steel backing + sintered bronze + PTFE sliding layer |
— |
|
Applicable Standards |
AS81934, AS8942, MIL |
Aerospace and industrial standards |
|
Minimum Temperature |
-65°F (-54°C) |
Complies with AS81934 standard |
|
Maximum Temperature |
+325°F (+163°C) |
Complies with AS81934 standard |
|
Custom Wide Temperature Range |
-180°C to +260°C |
Customized solutions available upon request |
|
Maximum Static Load |
482 N/mm² |
PTFE fabric liner |
|
Maximum Dynamic Load |
220-275 N/mm² |
PTFE fabric liner |
|
Coefficient of Friction |
0.02-0.15 |
Depends on load and temperature |
|
Tensile Strength |
270 MPa |
PTFE fabric liner |
Custom Size Range:
Inner Diameter: 6mm – 300mm+
Outer Diameter: Depends on specific design
Length: Depends on specific design
⚠️ NOT Suitable For:
Environments with strong acid or strong alkali atmospheres (phenolic resins may be affected; sealing requires attention for PTFE fabric liners)
High-temperature operating conditions exceeding 325°F (163°C) (please consult regarding custom solutions for wider temperature ranges if higher temperatures are required)
Extremely high-speed operating conditions (PTFE liners are recommended for heavy-load, low-speed applications)
|
Value Points |
Description |
Customer Benefits |
|
Maintenance-free (No lubrication required) |
PTFE self-lubricating; no external lubricants required |
Saves on lubricant and labor costs; eliminates oil contamination of products |
|
Long service life |
PTFE fabric liner offers 7–10 times the service life of traditional bearings |
Reduces replacement frequency and lowers long-term costs |
|
Corrosion resistance |
PTFE liner is resistant to almost all chemicals |
Suitable for corrosive environments; extends service life |
|
High load capacity |
Static load capacity up to 482 N/mm² |
Suitable for heavy-load operating conditions |
|
No stick-slip |
Low-friction PTFE properties ensure smooth operation |
Improves equipment operational quality |
|
Aerospace standard compliant |
Complies with AS81934 and AS8942 standards |
Suitable for demanding aerospace and industrial applications |
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Industry |
Typical Applications |
Key Requirements |
|
Aerospace |
Landing gear, actuators, flight control bearings |
Compliant with AS81934 standards, self-lubricating, wide operating temperature range |
|
Chemical & Petrochemical |
Valves, pumps, agitator bearings |
Corrosion resistance + self-lubrication |
|
Construction Machinery |
Scissor lifts, aerial work platforms |
High load/low speed + long service life |
|
Automotive |
Shock absorbers, suspension systems |
Maintenance-free + low friction |
|
Food & Beverage |
Food processing equipment bearings |
No lubricant contamination |
|
Semiconductor |
Cleanroom equipment bearings |
No particle shedding + chemical resistance |
|
Case Studies |
Challenge |
Solution |
Result |
|
Aerial Work Platform for a Construction Machinery Enterprise |
Metal bearings suffered severe wear under oil-free operating conditions, requiring replacement every six months. |
Replaced with PTFE-lined bushing (self-lubricating, heavy-load/low-speed) |
2 years of maintenance-free operation; maintenance costs reduced by 85% |
|
Aerospace Component Supplier |
A high-reliability bearing compliant with the AS81934 standard was required, but conventional solutions could not meet this need. |
Used PTFE fabric-lined bushing (AS81934 compliant) |
Certified to aerospace standards; service life of 10,000 cycles |
A: The main difference between PTFE-lined bushings and PTFE bushings is structure and load capacity.
PTFE bushings are solid sleeves made of virgin or filled PTFE, suitable for light-medium load and corrosive environments.
PTFE-lined bushings are thin-wall composite structures with a PTFE layer on a metal substrate, higher load capacity (static 482N/mm²), suitable for heavy low-speed applications.
Choose PTFE lined bushing for: Heavy low-speed, aerospace, construction machinery.
Choose PTFE bushing for: Light-medium load, corrosive environments, clean service. For specific selection advice, please provide your operating conditions.
A: Temperature: Meets AS81934 standard, -65°F to +325°F (-54°C to +163°C). For wider range (-180°C to +260°C) , custom solutions available upon request.
Static load: Up to 482 N/mm² (PTFE fabric liner). Dynamic load: 220-275 N/mm², suitable for heavy low-speed applications.
For specific selection data, please provide load, speed, temperature, and environmental conditions.
A: Yes. PTFE fabric lined bushings meet AS81934, AS8942, MIL aerospace standards. Suitable for high-reliability aerospace applications including landing gear, actuators, and flight control bearings.
Please specify the required standard when ordering, we can provide material certificates and test reports accordingly.
A: No. The PTFE liner itself has an extremely low coefficient of friction (0.02-0.15) and is fully self-lubricating, requiring no external lubricants.
PTFE fabric liners also offer good contamination resistance and excellent cold flow resistance, operating long-term under oil-free conditions.
In most applications, PTFE-lined bushings achieve truly maintenance-free operation.
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