Dia 20mm Engineering Anti Static POM Plastic Rods

Dia 20mm Engineering Anti Static POM Plastic Rods

3 week ago

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Foshan Anheda New Material Co., Ltd

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Product details

Dia 20mm Engineering Anti Static POM Plastic Polyoxymethylene Rod

Core Properties of Anti-Static POM Rods

Basic Material Properties

Polyoxymethylene (POM) is a highly crystalline thermoplastic engineering plastic (≥70%). Its molecular chain is composed of repeating -CH₂-O- units, resulting in strong regularity and imparting the following fundamental properties to the material:

Ultra-High Rigidity: Tensile strength ≥70 MPa, flexural strength ≥90 MPa, and elastic modulus ≥3000 MPa (close to that of aluminum alloy), making it suitable for high-load bearing structural parts (such as precision guide rails).

Extremely Low Friction and Self-Lubricating: The surface coefficient of friction is only 0.2-0.3 (compared to 0.15-0.3 for metallic steel, which requires lubrication). The dynamic coefficient of friction is approximately 30% lower than the static coefficient of friction, enabling its use in sliding parts (such as bearing bushings) without the need for additional lubrication.

Excellent dimensional stability: Linear expansion coefficient ≈8×10⁻⁶/℃ (about 1/2 of steel and 1/3 of aluminum), with little effect from temperature change (-40℃ to 100℃), suitable for precision scenes with strict tolerance requirements (such as semiconductor equipment positioning parts). High fatigue resistance: Under alternating loads (such as repeated friction and bending), fatigue life is 2-3 times higher than nylon (PA66), suitable for parts with long-term operation (such as gears and cams).

esd resistant pom material

Anti-static function implementation principle

Anti-static POM Rod controls surface/volume resistivity in the following two ways to inhibit static electricity accumulation:

(1) Conductive filler addition method (bulk modification) During the POM polymerization or extrusion molding process, conductive particles such as carbon black (CB), carbon fiber (CF), metal oxides (such as antimony tin oxide ATO), and conductive graphite are added to form a conductive network through contact or tunnel effect between particles, allowing the charge to be quickly discharged.

Carbon Black (Most Commonly Used): Ultrafine carbon black (such as acetylene black) with a particle size ≤30 nm. At a 3% to 8% addition rate, the surface resistivity can be reduced from 10⁵Ω to 10⁶-10⁹Ω (antistatic grade); at a ≥10% addition rate, the resistivity is further reduced to 10⁴-10⁶Ω (conductive grade). However, excessive addition can reduce POM stiffness (tensile strength decreases by approximately 10%-15%) and surface gloss.

Carbon Fiber: Chopped carbon fibers with a length of 3-12 mm (addition rate 2%-5%) form three-dimensional conductive pathways through fiber bridging, balancing antistatic properties with stiffness (carbon fibers have a tensile strength of ≥3000 MPa), making them suitable for applications requiring higher mechanical properties.

Metal Oxides (such as ATO): Nanoscale antimony tin oxide (particle size ≤50 nm) generates free electrons through ion doping, resulting in stable conductivity with minimal impact on material transparency.

pom material

(2) Surface antistatic treatment (coating/plating)

An antistatic coating (e.g., a polymer coating containing quaternary ammonium salts) or a metal plating (e.g., a conductive nickel layer) is formed on the surface of the POM rod by spraying, dipping, or plasma treatment to directly reduce the surface resistivity. This method does not change the properties of the POM itself, but the coating has limited adhesion (it may fall off after long-term friction) and is usually used for temporary antistatic needs (e.g., short-term use of fixtures in laboratories).

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Foshan Anheda New Material Co., Ltd

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5 month

Address: Dongguan, China

Main Product: Nylon Sheet, PE Sheet, PP Sheet, PEEK Sheet, POM Sheet, PTFE Sheet

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