POM is a semi-crystalline thermoplastic that bridges the gap between metals and ordinary plastics. Often referred to as "the metal of plastics," it offers high strength and rigidity while maintaining natural lubricity and resistance to moisture.
It is available in two primary chemical structures:
Acetal Copolymer (POM-C): The industry standard, offering better chemical resistance and thermal stability.
Acetal Homopolymer (POM-H / Delrin®): Offers slightly higher mechanical strength and stiffness but is more prone to centerline porosity.

We stock and machine a comprehensive range of POM grades to meet specific technical requirements:

Grade Category	Common Brands / Specs	Detailed Characteristics	Ideal Applications
POM-C (Acetal Copolymer)	Ultraform®, Celcon®, Tecaform®	High resistance to hydrolysis (hot water up to 80°C) and strong alkalis. Free from "centerline porosity" issues common in homopolymers. More thermally stable during machining.Porosity: Porosity-free.	Food contact parts, plumbing components, chemical pump housings, bushings in wet environments.
POM-H (Acetal Homopolymer)	DuPont™ Delrin® 150, Delrin® 100	Higher tensile strength, stiffness, and hardness than Copolymer. Better fatigue resistance. However, thick sections may contain centerline porosity (voids) due to the manufacturing process.Stiffness: ~15% stiffer than POM-C.	High-load precision gears, thin-walled parts, springs, snap-fit assemblies, zippers.
PTFE-Filled POM	Delrin® AF Blend	POM blended with PTFE (Teflon) fibers. Drastically reduces the coefficient of friction and eliminates "stick-slip" behavior. Slightly lower mechanical strength than unfilled POM.<br>Friction: Ultra-low.	High-speed sliding bearings, guide rails, linear motion components, valve seats.
Glass-Filled POM	POM-GF25 (25% Glass)	POM blended with PTFE (Teflon) fibers. Drastically reduces the coefficient of friction and eliminates "stick-slip" behavior. Slightly lower mechanical strength than unfilled POM.Friction: Ultra-low.	Structural components under high static load, dimensionally critical housings.
ESD / Static Dissipative POM	Semitron® ESD 225	Reinforced with glass fibers for significantly enhanced stiffness, tensile strength, and creep resistance. Reduced thermal expansion.Machining: Abrasive to tools.	Electronic fixture nests, disk drive components, semiconductor handling parts.

JUCHENG utilizes optimized processes to ensure high-precision POM parts:

• Clamping & Fixturing: POM has a low friction coefficient and can be slippery. We use serrated jaws or vacuum fixtures to secure parts firmly without excessive force that could cause deformation.

• Heat Sensitivity: POM is heat-sensitive. Overheating during machining can cause the material to decompose and outgas formaldehyde. We use sharp tools and adequate coolant to keep temperatures low.
• Tolerance Control: Because POM is dimensionally stable, we can routinely hold tolerances of +/- 0.02mm or better. It is one of the best plastics for precision work.
• Post-Processing: POM machining leaves a smooth, opaque finish. It does not accept paint or glue well due to its chemical resistance. We typically offer "as-machined" or bead-blasted finishes.

POM is widely used for precision parts requiring stiffness, low friction, and dimensional stability:

• Automotive: Fuel system sender units, door lock actuators, window lift gears, control switches, fuel caps.
• Consumer Electronics: Mechanical components in printers, zippers, appliance gears, keyboard switch components.
• Medical: Insulin pens, inhalers, surgical instrument handles (Medical grade POM required).
• Industrial Machinery: Conveyor links, guide rollers, springs, bushings, and snap-fit assemblies.
• Fluid Handling: Valve bodies, pump impellers, showerheads, and garden hose nozzles.

Comparison of Copolymer vs. Homopolymer vs. Glass-Filled:

Property	POM-C (Copolymer)	POM-H (Delrin®)	POM + 25% GF	Unit
Density	1.41	1.42	1.59	g/cm³
Tensile Strength	60 - 70	70 - 80	110 - 120	MPa
Flexural Modulus	2,600	3,000	7,500	MPa
Elongation at Break	20-30	40 - 50	2 - 3	%
Melting Point	165	175	165	°C
Water Absorption (24h)	0.20	0.25	0.20	%
Friction Coefficient (vs Steel)	0.25	0.28	0.35	Dynamic
Hardness (Rockwell)	M80 / R120	M86 / R122	M90	-

(Note: The values above are typical property values for reference purposes only. Actual values may vary depending on the specific supplier and grade.)

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