CELANESE HOSTAFORM C 9021 Standard POM Resin

Physical Properties

• Density: In accordance with ISO 1183, the material’s density is measured as 1410 kg/m³, indicating its mass per cubic meter in engineering applications.
• Shrinkage (Flow): As per ISO 294 standards, the flow-direction shrinkage of the material is 2%, reflecting dimensional change during the molding process.
• Shrinkage (xFlow): Based on ISO 294 testing, the cross-flow shrinkage is 1.9%, showing variation in shrinkage perpendicular to the material’s flow direction.
• Water Absorption: Following ISO 62, the material absorbs 0.65% water at saturation under 23°C, indicating its maximum moisture retention capacity.
• Humidity Absorption : As specified in ISO 62, the humidity absorption at 23°C and 50% relative humidity is 0.2%, highlighting low moisture uptake in ambient conditions.
• Melt Index: According to ISO 1133, the melt index at 190°C with a 2.16 kg load is 8 cm³/10min, characterizing the material’s flowability during processing.
• Melt Density: Determined by an internal method, the melt density is 1200 kg/m³, providing insight into the material’s density in its molten state for manufacturing purposes.

Polymer Properties:

• Base Material: Polyoxymethylene (POM)
• Modification Features
  
  • HB flammability rating offers basic fire – resistance in normal use.
  • High hardness and stiffness ensure dimensional stability of parts.
  • Good toughness allows parts to withstand impacts without cracking easily.
  • Excellent resistance to alkali, oxidation, chemicals, fuel, and solvents, enhancing durability in harsh environments.

Applications:

• Automotive Engineering:
  Hostaform® C 9021 is extensively used in automotive applications due to its high mechanical strength, chemical resistance, and low friction properties. Specific applications include:
  • Gears and Bearings: The resin’s low friction (coefficient of friction ~0.2–0.3 against steel) and wear resistance make it suitable for gears and bearings in systems like window regulators and seat adjusters. 
  • Interior Components: Used in clips, fasteners, and housings for dashboard parts, leveraging its low-emission variant (C 9021 XAP, VDA 275 compliant) for interior air quality and high toughness (Charpy unnotched impact strength ~150 kJ/m², ISO 179/1eU).
  • Fuel System Components: Employed in fuel line connectors and pump housings due to its resistance to fuels and solvents, with a tensile creep modulus of ~1,900 MPa after 1,000 hours (ISO 11403).
• 2. Precision Engineering:
  The medium flow and high toughness of Hostaform® C 9021 make it ideal for precision-molded parts with tight tolerances.
  • Connectors and Fasteners: Used in snap-fit connectors and cable ties, benefiting from high rigidity and resilience (nominal tensile strain at break ~25%, ISO 527-2). 
  • Precision Gears: Suitable for small, high-precision gears in mechanical assemblies due to its wear resistance and flow properties (viscosity vs. shear rate data, ISO 11403), enabling thin-walled parts with wall thicknesses as low as 0.5 mm.
    Data Evidence: The resin’s low water absorption (~0.8% at saturation, ISO 62) and high ball indentation hardness (~145 MPa, ISO 2039-1) ensure long-term dimensional stability and surface durability.
• 3. Electrical and Electronic Industry:
  Hostaform® C 9021 is used in electrical components due to its excellent electrical insulation and compliance with safety standards.
  • Electrical Connectors: Leverages high surface resistivity (~10¹⁴ Ω, IEC 60093) and volume resistivity (~10¹⁴ Ω·cm, IEC 60093) for reliable insulation in connectors and switchgear.
  • Housings for Electronics: Used in relay and sensor housings, benefiting from its dielectric strength (~35 kV/mm, IEC 60243-1) and comparative tracking index (CTI ~600 V, IEC 60112).
    Data Evidence: The resin’s UL 94 HB rating and thermal stability (DTUL ~103°C at 0.45 MPa) ensure safety and performance in electrical applications.
• 4. Domestic Appliances:
  Hostaform® C 9021 is utilized in household appliances for components requiring durability, chemical resistance, and regulatory compliance.
  • Appliance Housings and Components: Used in pump housings, valves, and handles for dishwashers and washing machines due to its resistance to detergents and hydrolysis.
  • Food-Contact Applications: Employed in food-processing equipment components like mixing blades and conveyor parts, complying with FDA (21 CFR 177.2470) and EU Regulation (EU) 10/2011.
• 5. Industrial Components:
  Hostaform® C 9021 is applied in industrial settings for components requiring robust mechanical properties and chemical resistance.
  • Pipe Fittings and Piping Systems: Used in fluid-handling systems for hot and cold water plumbing, leveraging its hydrolysis resistance and low water absorption. 
  • Conveyor Systems: Employed in rollers and guides due to its low friction and wear resistance, reducing maintenance needs.