Delrin AF

Delrin AF is a unique thermoplastic blend of Acetal Homopolymer and high-strength PTFE (Teflon) fibers. It represents the ultimate solution for engineers seeking the stiffness and strength of Delrin combined with the world-class low friction of PTFE. This self-lubricating material eliminates the need for external grease, preventing the "stick-slip" effect and reducing mechanical wear. At Jucheng Precision, we specialize in the high-precision CNC machining of Delrin AF into bushings, thrust washers, and silent-running gears. Our expertise in processing this "super-slippery" polymer ensures that your precision components are delivered with exceptional surface quality and the dimensional integrity required for maintenance-free mechanical assemblies.

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POM / Acetal Material Variants

Grade	Common Name	Key Characteristics	Typical Applications
Delrin AF	PTFE-Filled POM	Lowest coefficient of friction. Blended with 13% or 20% Teflon fibers. Extreme wear resistance.	High-speed bearings, thrust washers, moving slide components, silent gears.
Delrin 150	POM-H (Homopolymer)	Highest mechanical strength and stiffness. Best for precision gears.	Structural mechanical parts, precision gears, high-load clips.
POM-C	Acetal Copolymer	Zero centerline porosity and superior chemical resistance to hot water and bases.	Fluid manifolds, food processing parts, medical handles.

Delrin AF Machining Capabilities

Capability	Technical Description	Jucheng Advantage
Ultra-Smooth Bore Turning	Machining internal bearing diameters to Ra 0.4μm to maximize the self-lubricating effect of the PTFE fibers.	We utilize specialized diamond-polished inserts to ensure the Teflon fibers are sheared cleanly, creating a slippery, low-friction interface.
Precision Thrust Washer Milling	Milling thin, flat washers with strict parallelism (+/- 0.02mm) to prevent uneven wear in rotating assemblies.	Our vacuum workholding systems ensure that thin Delrin AF plates remain perfectly flat during high-speed milling operations.
Complex Low-Friction Cams	Using 4-axis CNC milling to create intricate cam profiles that operate without external grease.	Jucheng’s precision ensures smooth profile transitions, reducing mechanical noise and stick-slip vibration in automated machinery.
High-Volume Bushing Production	Rapid production of self-lubricating bushings using automated bar-fed Swiss lathes.	Offers high-speed output with extremely consistent dimensions, making Delrin AF a cost-effective alternative to lubricated bronze.

Fabrication Guidelines for Delrin AF

Distinctive Appearance:
Delrin AF is typically dark brown or chocolate in color due to the PTFE fibers. Tip: This makes it easily distinguishable from standard white or black POM during assembly and inspection.

Cutting Temperature:
While the PTFE fibers provide lubrication, heat buildup can still cause material softening. Tip: We use sharp tools and high-volume air blast or water-soluble coolant to keep the material rigid for accurate cutting.

Avoid Bonding:
Due to the high Teflon content, Delrin AF is almost impossible to glue or bond. Tip: Design your assembly using mechanical fasteners or interference (press) fits.

Environmental Stability:
Like all acetals, Delrin AF has very low moisture absorption. Tip: It maintains its precise dimensions even in submerged or high-humidity environments, unlike Nylon.

Primary Applications

High-Speed Sliding Bearings
Bushings and sleeves in office equipment and conveyors that must operate silently without liquid lubricants.

Medical & Laboratory Equipment
Moving parts in diagnostic machines where grease contamination would ruin sensitive samples or sensors.

Consumer Electronics
Internal sliding mechanisms for cameras, lens actuators, and high-end audio-visual equipment.

Industrial Automation
Guide rails, wear strips, and cam followers that require long-term durability and a low “breakaway” force.

Properties

Density	1.54 g/cm³
Tensile Strength	50 - 55 MPa
Elastic Modulus	2.8 - 3.0 GPa
Hardness	115 Rockwell R
Coefficient of Friction	0.15 (Dynamic)
Wear Rate	Outstanding
Continuous Service Temp	90 - 100 °C
Water Absorption	0.20%
Color	Dark Brown / Chocolate
Machinability Rating	Excellent
Max Part Size	2000 x 800 x 600 mm