描述
Hostaform C 2521 XAP2 is a stiff-flowing, polyacetal polyoxymethylene (POM) copolymer supplied by Celanese Corporation. This grade is specifically engineered for injection molding and extrusion applications requiring high impact toughness, good tracking resistance over a wide temperature range, and reduced emissions, making it particularly suitable for automotive interior applications .
Hostaform C 2521 XAP2 delivers a tensile modulus of 2,450 MPa and yield stress of 62 MPa, providing good mechanical performance for demanding precision parts . The material exhibits outstanding resistance to long-term fatigue, chemicals (including solvents, fuel, and strong alkalis), wear, creep, hydrolysis, stress cracking, and thermal and oxidative degradation .
With its XAP2 Advanced Processing designation, Hostaform C 2521 XAP2 offers improved flow characteristics for complex parts while maintaining low emission profiles (VDA 275 <5 mg/kg) . The material meets FORD WSK-M4D635-A1 automotive specification and is available globally . It complies with RoHS, ELV, and REACH regulations .
Hostaform C 2521 XAP2 Key Features
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High Impact Toughness: Outstanding impact resistance (Charpy notched impact 8.5 kJ/m² at 23°C) compared to standard POM grades
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Stiff-Flowing: Excellent flowability for complex injection molded parts; MVR of 2.5 cm³/10min at 190°C/2.16kg
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Low Emission: Reduced VOC emissions (VDA 275 <5 mg/kg), suitable for automotive interior applications
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Good Tracking Resistance: Excellent tracking resistance over a wide temperature range
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Good Chemical Resistance: Resists solvents, fuel, strong alkalis; good hydrolysis resistance
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Thermal & Oxidative Stability: High resistance to thermal and oxidative degradation over time
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Good Heat Distortion Temperature: HDT of 101°C at 1.80 MPa
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Low Moisture Absorption: Only 0.2% at equilibrium (50% RH), ensuring stable dimensions
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Added Release Agent: Contains release agent for easier demolding
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Regulatory Compliant: Meets RoHS, ELV, REACH, and FORD WSK-M4D635-A1 specifications
Related Products
- Hostaform C 13021 – Standard High Rigidity POM Copolymer
- Hostaform C 13021 XAP – Easy Flow Low Emission POM
- Hostaform C 13031 – High Strength POM Copolymer
- Hostaform C 13031 10/9022 – Black POM for Laser Welding
- Zytel ST801UV NC010 – Super Tough UV Stabilized PA66
Hostaform C 2521 XAP2 Applications
Automotive Interior: Components requiring low emissions and high impact toughness, meeting FORD WSK-M4D635-A1 specification
Injection Molding: Precision gears, sliding elements, mechanical components requiring high impact resistance and dimensional stability
Extrusion Applications: Film, sheet, profile extrusion, and blow molding processes
Automotive Engineering: Fuel system components, window regulator mechanisms, seat belt components requiring chemical resistance and low emissions
Hostaform C 2521 XAP2 Technical Specifications
| Property | Test Condition | Standard | Value | Unit |
|---|---|---|---|---|
| Density | — | ISO 1183 | 1,410 | kg/m³ |
| Water Absorption | Saturation, 23°C | Sim. to ISO 62 | 0.65 | % |
| Humidity Absorption | 50% RH, 2mm | Sim. to ISO 62 | 0.20 | % |
| MVR (Melt Volume Rate) | 190°C/2.16kg | ISO 1133 | 2.5 | cm³/10min |
| Melt Density | — | Internal | 1,200 | kg/m³ |
| Tensile Modulus | 23°C | ISO 527 | 2,450 | MPa |
| Tensile Stress at Yield | 23°C, 50mm/min | ISO 527 | 62 | MPa |
| Tensile Strain at Yield | 23°C, 50mm/min | ISO 527 | 9 | % |
| Nominal Strain at Break | 23°C | ISO 527 | 35 | % |
| Charpy Notched Impact | 23°C | ISO 179/1eA | 8.5 | kJ/m² |
| Charpy Notched Impact | -30°C | ISO 179/1eA | 7.0 | kJ/m² |
| Charpy Unnotched Impact | 23°C | ISO 179/1eU | 250 | kJ/m² |
| HDT (1.80 MPa) | Unannealed | ISO 75-1/-2 | 101 | °C |
| Melting Temperature | 10°C/min | ISO 11357-3 | 166 | °C |
| CLTE (Parallel) | — | ISO 11359 | 120×10⁻⁶ | 1/K |
| CLTE (Transverse) | — | ISO 11359 | 120×10⁻⁶ | 1/K |
| Volume Resistivity | — | IEC 62631-3-1 | 1×10¹² | Ω·m |
| Surface Resistivity | — | IEC 62631-3-2 | 1×10¹⁴ | Ω |
| Dielectric Strength | — | IEC 60243-1 | 35 | kV/mm |
| Relative Permittivity (100Hz/1MHz) | — | IEC 62631-2-1 | 4.0/4.0 | — |
| Dissipation Factor (100Hz/1MHz) | — | IEC 62631-2-1 | 15/50 | ×10⁻⁴ |
| CTI (Comparative Tracking Index) | — | IEC 60112 | 600 | V |
| UL Flammability | 1.5-3.0mm | UL-94 | HB | — |
| FMVSS Burning Rate | 1mm | FMVSS 302 | <100 | mm/min |
| Emission (VDA 275) | 1.5mm molded plate | VDA 275 | <5 | mg/kg |
Processing Guide
| Parameter | Recommended Value |
|---|---|
| Drying Recommended | Recommended for low emission values |
| Drying Temperature | 100 – 120°C |
| Drying Time | 3 – 6 hours |
| Max. Moisture Content | ≤ 0.1% |
| Melt Temperature Optimum | 190 – 210°C |
| Melt Temperature Range | 180 – 220°C |
| Mold Temperature Optimum | 100°C |
| Mold Temperature Range | 60 – 120°C |
| Holding Pressure | 60 – 120 MPa |
| Back Pressure | 4 MPa |
| Max Screw Tangential Speed | 0.2 – 0.21 m/s |
| Ejection Temperature | 140°C |
Hostaform C 2521 XAP2 FAQ
Q: What is Hostaform C 2521 XAP2?
A: Hostaform C 2521 XAP2 is a stiff-flowing, low emission POM copolymer from Celanese for injection molding and extrusion requiring high impact toughness and reduced emissions, especially for automotive interior applications .
Q: What does “XAP2” mean?
A: “XAP” stands for Advanced Processing, indicating the material offers enhanced flow and processing characteristics for complex parts. “XAP2” denotes an improved generation of this technology.
Q: What is the difference between Hostaform C 2521 XAP2 and C 13021?
A: Hostaform C 2521 XAP2 offers significantly higher impact toughness (Charpy notched 8.5 vs 6.5 kJ/m²), lower emissions (VDA 275 <5 mg/kg), and is specifically designed for automotive interior applications requiring excellent toughness and low VOC levels .
Q: What is the impact strength of this material?
A: It offers Charpy notched impact of 8.5 kJ/m² at 23°C and 7.0 kJ/m² at -30°C .
Q: What automotive specifications does this material meet?
A: It meets FORD WSK-M4D635-A1 specification and complies with RoHS, ELV, and REACH regulations .
Q: Is drying required before processing?
A: To achieve low emission values, pre-drying using a recirculating air dryer at 100–120°C for 3–6 hours is recommended. Maximum moisture content should be below 0.1% .
Q: What are the recommended processing conditions?
A: Melt temperature 180–220°C (optimum 190–210°C), mold temperature 60–120°C (optimum 100°C), with back pressure of 4 MPa .
Q: What applications is this material suitable for?
A: It is ideal for automotive interior components, injection molded parts, film, sheet and profile extrusion, and blow molding applications requiring high impact toughness and low emissions .
