PRECISION ENGINEERING
LOW FRICTION

POM Injection Molding Solutions

Rapidaccu delivers exceptional POM (acetal/polyoxymethylene) injection molding services. With 15 years of engineering plastic expertise, we produce high-precision components featuring excellent dimensional stability, low friction coefficient, and superior wear resistance for demanding mechanical applications.

±0.02mm
Tolerance
0.2-0.3
Friction
High
Stiffness
15+
Years
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POM Injection Molding

Understanding POM Engineering Plastic

Polyoxymethylene (POM) is a high-performance engineering thermoplastic renowned for exceptional mechanical properties

Material Composition

POM is a semi-crystalline polymer with repeating methylene oxide units. Available as homopolymer (high stiffness) and copolymer (better chemical resistance) grades for different applications.

Mechanical Excellence

Outstanding strength, rigidity, and hardness combined with excellent dimensional stability. Low moisture absorption ensures consistent performance in varying environments.

Processing Benefits

Excellent moldability with low shrinkage and minimal warpage. Good thermal stability during processing enables consistent part quality and tight tolerances.

Key POM Properties

Tensile Strength
60-70 MPa
Flexural Modulus
2.6-2.8 GPa
Melting Point
165-175°C
Density
1.41-1.43 g/cm³

Why Choose POM for Your Application

Low Friction

Coefficient of friction 0.2-0.3 enables self-lubricating properties ideal for gears, bearings, and sliding components without external lubrication

High Stiffness

Excellent rigidity and creep resistance maintain dimensional stability under sustained loads, perfect for precision mechanical parts

Low Moisture

Minimal water absorption (0.2-0.8%) ensures dimensional stability in humid environments and consistent performance

Chemical Resistant

Good resistance to fuels, solvents, and most chemicals except strong acids, bases, and oxidizing agents

Tight Tolerances

Low shrinkage rate (1.8-2.5%) enables precision molding with excellent dimensional accuracy for critical applications

Fatigue Resistance

Excellent fatigue properties withstand repeated stress cycles, ideal for spring clips, snap fits, and moving parts

POM Injection Molding Applications

Precision Gears & Bearings

Low friction and high wear resistance make POM ideal for gears, bushings, bearings, and sprockets in automotive, industrial, and consumer applications requiring smooth operation and long service life.

Timing gears
Sleeve bearings
Worm gears
Sprocket wheels

Automotive Components

Fuel system parts, door lock mechanisms, window regulators, and seat adjustment components benefit from POM chemical resistance to fuels and excellent dimensional stability.

Fuel pump parts
Valve components
Lock mechanisms
Sensor housings

Electronics

Precision components for keyboards, switches, connectors, and mechanical assemblies requiring dimensional accuracy

  • • Keyboard mechanisms
  • • Connector housings
  • • Switch components

Medical Devices

Sterilizable components for surgical instruments, drug delivery systems, and diagnostic equipment

  • • Surgical handles
  • • Pump components
  • • Instrument parts

Consumer Products

Zippers, fasteners, clips, and household product components requiring durability and smooth operation

  • • Zipper sliders
  • • Snap fasteners
  • • Belt buckles

POM Processing Expertise

POM injection molding requires specialized knowledge and precise process control to achieve optimal results. Our 15 years of experience ensures consistent quality and performance.

Temperature Management

Precise barrel temperature control (180-220°C) prevents thermal degradation while ensuring proper melt flow for complete cavity filling.

Mold temp: 80-100°C for optimal crystallization

Material Drying

Thorough pre-drying at 80-100°C for 2-4 hours ensures optimal melt quality and prevents surface defects from moisture contamination.

Max moisture: < 0.2% for quality parts

Precision Molding

Controlled injection speed and pressure optimize molecular orientation for maximum strength and dimensional accuracy in finished parts.

Tolerance: ±0.02mm achievable

POM Grades Available

Homopolymer POM

Higher strength, stiffness, and hardness. Optimal for gears and mechanical components requiring maximum rigidity.

Copolymer POM

Better thermal stability and chemical resistance. Lower formaldehyde emission, ideal for consumer and medical applications.

Glass-Filled POM

Enhanced stiffness and strength with reduced shrinkage. Used for structural parts requiring extra reinforcement.

PTFE-Modified POM

Ultra-low friction coefficient for bearing and sliding applications requiring self-lubricating properties.

Production Capabilities

Machine Range 50-500 tons
Part Weight 1g – 1.5kg
Tolerance ±0.02mm
Annual Capacity 15M+ parts

Design Guidelines for POM Parts

Optimal Design Practices

Wall Thickness

Maintain 0.8-3.0mm uniform thickness. Thicker sections require longer cooling time and may show sink marks.

Corner Radii

Use minimum 0.3mm radius on all edges to reduce stress concentration and improve mold filling.

Draft Angles

Minimum 0.5-1° draft on vertical walls facilitates part ejection and prevents surface damage.

Gate Location

Position gates to minimize weld lines in high-stress areas and optimize mechanical properties.

Common Challenges

Formaldehyde Emission

POM can release formaldehyde at high temperatures. Use proper ventilation and consider copolymer grades for sensitive applications.

Thermal Degradation

Avoid prolonged exposure to elevated temperatures during processing. Purge barrel thoroughly when changing materials.

Weld Line Strength

POM weld lines can be weak points. Optimize gate placement and use higher mold temperatures to improve bonding.

Post-Mold Shrinkage

POM continues crystallizing after molding. Critical dimensions may require post-molding annealing for stability.

Frequently Asked Questions

Q What are the main advantages of POM for precision parts?

POM offers exceptional dimensional stability, low friction coefficient (0.2-0.3), high stiffness, excellent wear resistance, and minimal moisture absorption. These properties make POM ideal for gears, bearings, and precision mechanical components requiring tight tolerances and long service life without lubrication.

Q What is the difference between homopolymer and copolymer POM?

Homopolymer POM offers higher strength, stiffness, and hardness but lower chemical resistance. Copolymer POM has better thermal stability, superior chemical resistance, lower formaldehyde emission, and better long-term stability. We recommend homopolymer for maximum mechanical properties and copolymer for chemical exposure or medical applications.

Q Can POM parts be used in automotive fuel systems?

Yes, POM exhibits excellent resistance to gasoline, diesel, and most automotive fluids. Copolymer POM grades are particularly suitable for fuel system components. However, POM should not be used with strong acids or oxidizing agents. We can recommend appropriate grades based on your specific fuel system requirements.

Q What tolerances can be achieved with POM injection molding?

POM low shrinkage rate (1.8-2.5%) enables tight tolerances of ±0.02mm or better for critical dimensions. Actual tolerance capability depends on part geometry, size, and processing conditions. Our precision mold manufacturing and process control ensure consistent dimensional accuracy for demanding applications.

Q Is POM suitable for food contact applications?

Food-grade POM formulations are available and comply with FDA regulations for food contact. Copolymer POM is generally preferred for food applications due to lower formaldehyde emission. POM is commonly used for food processing equipment, appliance components, and utensils requiring wear resistance and dimensional stability.

Q Why choose Rapidaccu for POM injection molding?

With 15 years of engineering plastic expertise, specialized POM processing knowledge, precision molding capabilities, and comprehensive quality systems, Rapidaccu delivers consistent results for demanding applications. Our Shenzhen facility combines advanced equipment with skilled technicians to ensure reliable POM parts meeting international standards at competitive pricing.

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Start Your POM Injection Molding Project

Partner with engineering plastic specialists for precision POM components

Contact Rapidaccu

Manufacturing Facility

Rongli Industrial Park, Dalang, Longhua District, Shenzhen, China

Experience

15 years of POM injection molding expertise

POM Molding Capabilities

Multiple POM grades available
Precision tolerance capability
Low friction optimization
ISO certified quality
Global shipping services

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