POM-Celanese Celcon M90
Withstanding prolonged exposure to alkaline detergents and hot water without hydrolytic breakdown requires a specialized acetal copolymer, which Celcon M90 by Celanese delivers through its stable polyoxymethylene copolymer matrix. Featuring a density of 1.41 g/cm³ and a melt index of 9.0 cm³/10 min, this unreinforced grade offers superior hot-water stability and far lower mold plate-out (deposits) during continuous production than homopolymer acetals. At Jucheng Precision, an ISO 9001, ISO 13485, and IATF 16949 certified manufacturer, we specialize in molding Celcon M90. Using our in-house 5-axis CNC-machined S136 stainless steel molds, we control its 1.8% to 2.2% shrinkage, delivering dimensionally stable water valves verified by Zeiss CMM.
Celcon M90 Copolymer Hydrolytic & Thermal Profile
Celcon® M90 is a medium-viscosity acetal copolymer (POM-C) engineered by Celanese to deliver exceptional chemical inertness, high thermal stability, and low mold deposit during long-term production runs:
| Thermal/Chemical Feature | Celcon M90 Metric | Copolymer (POM-C) Life Cycle Advantage |
|---|---|---|
| Hydrolytic Stability | High resistance to hot water & strong bases | Exhibits superior resistance to strong alkaline detergents and hot-water hydrolysis compared to acetal homopolymers, preventing part chalking and degradation. |
| Processing Stability | Low-deposit chemical formulation | Designed to minimize mold deposit (plate-out) during continuous injection cycles, dramatically reducing downtime for mold cleaning and maintenance. |
| Physical Modulus | Flex Modulus 2600 MPa / Tensile 65 MPa | Offers high flexural strength and surface hardness, ensuring dimensional stability in high-wear water valves and fuel caps. |
Precision Engineering Process Suitability for Celcon M90
With its high-crystallization profile and low outgassing chemistry, Celcon M90 is optimized for dynamic mechanical assemblies:
| Process Classification | Engineering Implementation Details |
|---|---|
| Precision Fluid Valves & Water Fittings | Excellent. Fully optimized for hot water mixer valves, fuel caps, water meter housings, spray nozzles, and plumbing connectors requiring long-term chemical resistance. |
| Intricate Snap-Fit Fasteners | Excellent. High elastic recovery and flexural strength prevent structural fingers from shearing or stress whitening during continuous assembly. |
| Multi-Cavity Automations | Excellent. Exceptional thermal stability inside the hot runner manifold allows for rapid, low-maintenance injection cycles with tight dimensional repeatability. |
Molding Analysis: Celcon M90 Tooling & Low-Mold-Deposit Matrix
Molding an acetal copolymer like Celcon M90 requires specialized water-line layouts to counteract high shrink factors, alongside premium steel choice to prevent dynamic outgassing wear:
Low Mold Deposit (Plate-Out) Protection
Compared to homopolymer variants, Celcon M90 generates substantially fewer surface deposits (additives plate-out) on mirror-polished mold face cores. Jucheng’s tooling division uses premium S136 stainless steel hardened to 48–52 HRC to prevent chemical wear, increasing tool run lives between cleanings by up to 50%.
Compensating for High Volumetric Shrinkage
Acetal copolymer exhibits high volumetric shrinkage (1.80% to 2.20%). We employ conformal cooling loops machined on our 5-axis CNCs directly into core and cavity inserts, ensuring uniform heat dissipation across thin-walled valve bodies to prevent warpage and voiding.
Melt & Die Temperature Controls
Processing melt temperatures are maintained between 180°C and 210°C (356°F to 410°F) to protect molecular chain structures. Mold temperatures are kept at 80°C to 120°C (176°F to 248°F) using pressurized oil temperature controllers to optimize crystalline structure and mechanical strength.
Key Application Fields for POM-Celanese Celcon M90
- Hot-Water Plumbing & Fluids: Household hot-water mixer faucet valves, showerhead manifolds, central heating water regulators, flow meters, and pipe couplings.
- Automotive Fuel & Fluids (IATF 16949 Certified): Fuel sender caps, fuel tank breather valves, windshield wiper pivots, window regulator brackets, and cooling radiator connectors.
- Medical Consumables & Systems (ISO 13485 Compliant): Pharmaceutical dry-powder inhalers, surgical instrument sliding guides, dental testing caps, and non-implantable dynamic valve structures.
Properties
| Density | 1.41 g/cm³ |
| Melt Volume-Flow Rate (MVR) (190°C/2.16kg) | 9 cm³/10min |
| Tensile Modulus | 2,800 MPa |
| Tensile Stress at Yield | 65 MPa |
| Elongation at Yield | 9 % |
| Nominal Strain at Break | 30 % |
| Flexural Modulus | 2,600 MPa |
| Flexural Strength | 91 MPa |
| Notched Charpy Impact Strength (23°C) | 6 kJ/m² |
| Melting Temperature | 165 °C |
| Vicat Softening Point (B/50) | 144 °C |
| Heat Deflection Temperature (HDT @ 1.80 MPa) | 110 °C |
| Linear Mold Shrinkage | 1.80 - 2.20 % |
| Maximum Part Size | 1000 x 800 mm |
| Minimum Part Size | 1 x 1 mm |