Colored POM Plastic Sheets Polyoxymethylene Sheet

2 month ago

1 0 

8 month

Product details

Colored POM Plastic Sheets Polyoxymethylene Sheet

Colored POM Sheets (colored polyoxymethylene sheets) are engineering plastic sheets made from polyoxymethylene (POM, commonly known as "acetal") as the base material, achieving diverse colors through the addition of color masterbatches or blended pigments. POM is a highly crystalline thermoplastic engineering plastic with a main chain composed of repeating -O-CH₂- units, possessing metal-like rigidity, excellent self-lubricating properties, extremely high dimensional stability, and fatigue resistance, earning it the reputation of "super steel" or "acetal".

Colored POM Sheets retain the core properties of POM, such as high strength, high rigidity, low coefficient of friction, and resistance to repeated friction. Through color customization (such as black, white, red, blue, etc.), they meet the needs of appearance identification, functional differentiation, or aesthetic design. Widely used in scenarios requiring mechanical performance, dimensional accuracy, and visual appeal, they represent a superior engineering plastic solution combining functionality and aesthetics.

POM Sheet

Core Performance Parameters and Advantages

1. Basic Physical Properties

Density: 1.41-1.43 g/cm³ (Very consistent with natural POM; density remains almost unchanged when masterbatch addition is ≤2%)

POM itself has a high density (close to metallic aluminum), and the effect of colorization due to small amounts of pigment/masterbatch is minimal.

Color: Black (most common, carbon black added for enhanced UV resistance), white, red, blue, yellow, green, etc. (custom colors) Colored POM can achieve full color gamut coverage through masterbatch. Commonly used industrial colors are black (wear-resistant + anti-aging), white (clean environment), and functional distinguishing colors (such as red/blue for identification).

Surface Finish: Smooth mirror finish (polished from extruded or calendered sheets), matte (surface treatment), textured (anti-slip/functional)

The surface can be further processed (such as CNC cutting, polishing, or coating). Smooth surfaces are suitable for precision bonding, while matte/textured surfaces are used for anti-slip or decorative purposes.

2. Mechanical Properties (Ultra-high Rigidity + High Strength)

Tensile Strength: 60-75 MPa (close to 1/3-1/2 of low-carbon steel, but only 1/7 the weight of steel);

Flexural Strength: 90-110 MPa (can withstand medium to high bending loads, such as equipment supports);

Elastic Modulus: 2800-3200 MPa (far higher than ordinary plastics (such as PA6, approximately 1500-2500 MPa), close to 40% of aluminum alloys (approximately 7000 MPa), exhibiting outstanding rigidity);

Elongation at Break: 20%-40% (relatively low, demonstrating high resistance to deformation, with a slightly higher tendency towards brittleness than tough plastics);

Notched Impact Strength: 10-25 kJ/m² (Performs well under normal conditions (23℃), but impact strength decreases at low temperatures (-40℃);

Compressive strength: 120-150 MPa (Suitable for axial or radial pressure, such as pads or bearing housings).

Typical applications: Delrin Sheet is used for components requiring high rigidity support or lightweight structures (such as precision instrument bases, gear drives, and industrial fixtures). Its strength and rigidity can replace some metallic materials (such as zinc alloys and aluminum alloys) while significantly reducing weight.

3. Wear Resistance and Self-Lubricating Properties (Industry Leading)

Coefficient of Friction: Approximately 0.15-0.30 when rubbing against steel (compared to approximately 0.1-0.15 for ordinary plastics like PA6, but POM is more wear-resistant), and even lower when rubbing against itself (approximately 0.1-0.2);

Wear Rate: Extremely low (under unlubricated conditions, the wear of POM is only 1/3-1/5 that of PA6, and 1/10-1/20 that of metal);

Self-Lubricating Properties: Allows for smooth operation under low to medium speeds and light loads without additional lubrication (e.g., in guide rails, sliders, and bearing bushings).

Core Mechanism: The polar oxygen atoms in the POM molecular chain form a weak adsorption film on the metal surface, reducing direct friction; simultaneously, its high crystallinity (approximately 75%-85%) gives the surface a smooth microstructure, further reducing wear.

Typical Applications: Colored POM sheets are used as conveyor belt idler roller bushings, mechanical transmission components (such as gears and worm gears), linear guide rail supports, and precision instrument sliders, especially suitable for applications requiring long-term maintenance-free lubrication (such as food machinery and medical equipment).

POM Plastic Sheet

4. Heat Resistance (Stable at Medium and High Temperatures)

Heat Deflection Temperature (HDT, 1.82 MPa load): Natural POM approximately 110-125℃, colored POM (when the masterbatch temperature is matched) can reach 110-130℃ (this can be further increased if the masterbatch contains high-temperature additives);

Continuous Operating Temperature: -40℃ to 100℃ (short-term resistance to 120-130℃, such as short-term high-temperature conditions);

Melting Point: Approximately 165-175℃ (the crystallization melting temperature of POM), processing temperature is typically 170-200℃.

Limitations: Colored POM sheets are not suitable for long-term use in environments above 120℃ (the molecular chains will gradually soften at high temperatures, leading to a decrease in mechanical properties), but they can maintain basic functionality even at short-term temperatures around 130℃.

5. Dimensional Stability (Ultra-High Precision Fit)

Water Absorption: 0.2%-0.3% (extremely low; common plastics such as PA6 have a water absorption of approximately 2%-3%, and ABS approximately 0.5%-0.8%);

Coefficient of Linear Expansion: Approximately 8×10⁻⁵/℃ (about 1/3 that of aluminum and 1/4 that of steel);

Processing Accuracy: Tolerances of ±0.05mm can be achieved through precision molding or extrusion (suitable for direct molding of high-precision parts).

Advantages: In humid environments (such as outdoor equipment, high-humidity workshops) or temperature fluctuation scenarios, the dimensions of the colored POM Sheet remain almost unchanged, ensuring assembly accuracy (such as positioning plates for precision instruments, fixture base plates).

6. Chemical Resistance (Resistant to most solvents but not strong acids)

Acid and Alkali Resistance: Stable at room temperature to weak acids/bases such as dilute hydrochloric acid (10%), dilute sulfuric acid (10%), and sodium hydroxide (10%); slowly corrodes to strong acids (concentrated nitric acid, concentrated sulfuric acid) and strong bases (sodium hydroxide above 40% at high temperatures).

Organic Solvent Resistance: Long-term stability to non-polar solvents (such as gasoline, mineral oil, lubricating oil) (suitable for machine oil contact scenarios); swelling or dissolving to polar solvents (such as acetone, ethyl acetate, chloroform) and aromatic hydrocarbons (such as benzene, toluene) (long-term contact should be avoided).

Water/Water Vapor Resistance: Due to extremely low water absorption, the dimensions remain almost unchanged after long-term immersion in water or steam (superior to hydrophilic plastics such as PA6). Typical Applications: Colored POM sheets are suitable for components in chemical equipment that come into contact with non-corrosive media (such as bushings for weak acid and alkali transfer pumps) and weather-resistant structural components for outdoor equipment (such as street light bases and bridge railing supports). Their water resistance and dimensional stability are superior to most ordinary plastics.

Delrin Sheet

7. Electrical Properties (Good Insulation)

Volume Resistivity: >10¹⁴ Ω·cm (High insulation);

Dielectric Strength: ≥18 kV/mm (Withstands low-voltage breakdown);

Dielectric Constant: 3.0-3.5 (Moderate, minimal impact on signal transmission).

Typical Applications: Polyoxymethylene sheet can be used for housings of low-voltage equipment (such as socket panel supports) and isolation boards for electronic components (balancing insulation and mechanical strength).