Part Requirements and Material Selection
Locate the first failing region, then choose screening criteria: fatigue/impact at tooth roots, friction/wear at sliding faces, deflection/creep in loaded supports.
For an existing part, record the current material, molding method, dimensions, assembly, and known problems. Wear, cracking, deformation, noise, static, discoloration, or unstable molding may require different material directions.
For a new part, define the intended use before comparing grades. Market references can support screening, but they cannot replace the required material characteristics for the actual component.
Material screening connects the molded geometry, working environment, contact conditions, and failure risk before a modified POM direction is selected.
Define the Application Conditions Clearly
Define the movement, mating surface, load, speed, temperature range, chemicals, moisture, UV exposure, and electrical function. Review these conditions together because one requirement can change the preferred material balance.
Separate short assembly loads from continuous stress, repeated loading, impact, and vibration. Include frictional heat, nearby heat sources, thermal cycling, and dimensional tolerances instead of relying on one maximum temperature.
For chemical contact, identify the substance, concentration, exposure time, and temperature. Fuel, grease, cleaners, process fluids, and detergents can create different risks.
- Sliding, rotating, oscillating, or intermittent movement
- Contact with metal, plastic, rubber, or coated surfaces
- Dry running or externally lubricated operation
- Continuous or occasional operation, surface pressure, speed, and expected cycles
Compare Standard, Wear-Resistant, Low-Friction, and High-Impact POM
For general precision parts, establish molding and dimensional baselines with standard POM. For short filling, compare flow grades; for load deficits, reinforced formulations. Separate processing limitations from strength gaps.
For meshing or sliding wear and clearance growth, shortlist MoS₂-modified EMS102 and EMS162. Start with EMS102 for flow-sensitive molding and EMS162 when tensile strength leads selection.
For low-speed starts, dry sliding or stick-slip noise, start with PTFE-modified EPTL402. Compare starting force, running torque and wear separately for steel–plastic and plastic–plastic pairs.
For assembly impact, sudden loads or cold cracking, start with toughened POM EHI402T. Balance notched impact with stiffness and recheck clip retention or drive clearance.
Initial POM direction screening map
When to Consider Glass Fiber or Carbon Fiber Reinforced POM
For load deformation or location drift, compare EGH302H (15% GF) with EGH602H (30% GF). Alongside stiffness, check orientation-driven warpage, assembly toughness and mating-surface wear.
Glass fiber can change flow, surface appearance, shrinkage direction, dimensions, and counterpart wear. Tight-tolerance parts require review of the gate, flow path, weld lines, wall thickness, and fiber orientation.
For stiffness combined with conductivity, start with ECF300 (30% carbon-fiber POM). Check flow/transverse dimensions, resistance and grounding contacts separately to define electrical performance.
Review when stiffness, load support, and deformation control are the main gaps, while checking orientation, surface, and counterpart wear.
Review when high stiffness, lower deformation, conductivity, or a different friction and weight balance merits investigation.
Conductive, Antistatic, UV-Resistant, and High-Impact Directions
Define resistance targets and grounding, then establish a baseline with conductive grades such as ECN1003B. Retain voltage, electrode positions and environment in molded-part measurements to compare formulation changes.
Electrical modification can change color, flow, mechanics, surface, and processing. A conductive or antistatic label is therefore one requirement, not a complete material specification.
Use weather-modified POM ETM090U as the baseline for exposed parts. Add EDR180U when impact toughness and a matte finish are needed; check color, cracking and cold assembly retention after light exposure.
How to Read a POM TDS Cautiously
Use a TDS to compare grades under stated test methods and specimen conditions. Do not read its values as a direct prediction of the molded part.
Tensile, flexural, impact, elongation, and flow data support screening. Part geometry, weld lines, orientation, stress, gate size, venting, tool conditions, and machine capability can change the production result.
Wear and friction data depend on the mating material, surface, load, speed, lubrication, temperature, and method. One laboratory value cannot represent every moving component.
Why Molded-Part Trials Are Necessary
Establish a stable window in the target tool and retain cavity, batch and measurement time. Compare filling, critical dimensions and weld lines before assembly and function tests.
Check filling, appearance, dimensions, warpage, shrinkage, weld lines, ejection, consistency, assembly, and function. For moving parts, test wear, friction, noise, and counterpart behavior under representative conditions.
What to Send for Material Review
Submit the failure, drawing or function and current material for a POM grade comparison, TDS and trial-sample support. Use the checklist to define molding and functional checks; release against acceptance results from the target tool and part.
- Part name, drawing, photo, or application description
- Current material and current performance issues
- Required stiffness, impact, wear, friction, or electrical behavior
- Movement, mating material, load, speed, pressure, and service cycle
- Operating temperature and environmental exposure
- Contact with chemicals, oils, cleaners, fuel, water, or UV
- Color, surface, dimensional, and processing requirements
- Existing TDS, test reports, or failed-part observations