描述
Hostaform C 27021 XAP2 is an easy-flowing, high-performance polyacetal polyoxymethylene (POM) copolymer supplied by Celanese Corporation. This grade is specifically engineered for injection molding applications requiring reduced emissions, making it particularly suitable for automotive interior components. The “XAP2” designation indicates an innovative development grade with Advanced Processing characteristics and second-generation improved formulation.
Hostaform C 27021 XAP2 delivers a tensile modulus of 2,750 MPa, yield stress of 64 MPa, and nominal strain at break of 17%, providing good mechanical performance for precision parts. The material exhibits outstanding resistance to long-term fatigue, chemicals (including solvents, fuels, and strong alkalis), wear, creep, hydrolysis, stress cracking, and thermal and oxidative degradation.
The key differentiator of Hostaform C 27021 XAP2 is its very low emission profile. Natural grades achieve VDA 275 emission levels below 2 mg/kg, while colored grades are below 5 mg/kg. The material also meets FMVSS 302 burning rate standards (<100 mm/min at 1 mm thickness). Hostaform C 27021 XAP2 complies with RoHS, PFOS, and PFOA regulations and meets the recommendation XXXIII for consumer goods of the BgVV. It is commercially available globally in North America, Europe, Asia Pacific, Latin America, Africa, and the Middle East.
Hostaform C 27021 XAP2 Key Features
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Easy Flow: MVR of 24 cm³/10min at 190°C/2.16kg – excellent flow for complex injection molded parts
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Very Low Emissions: VDA 275 emission < 2 mg/kg (natural grades) and < 5 mg/kg (colored grades), suitable for automotive interior applications
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High Rigidity & Strength: Tensile modulus of 2,750 MPa and yield stress of 64 MPa
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Good Impact Resistance: Charpy notched impact strength of 5.5 kJ/m² at 23°C and -30°C
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Good Chemical Resistance: Resists solvents, fuels, strong alkalis; good hydrolysis resistance
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Excellent Fatigue & Creep Resistance: High resistance to long-term fatigue and creep under continuous load
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Thermal & Oxidative Stability: High resistance to thermal and oxidative degradation over time
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Good Heat Distortion Temperature: Melting temperature of 164°C
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Low Moisture Absorption: Only 0.20% at equilibrium (50% RH), ensuring stable dimensions
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Good Slip Properties: Low coefficient of friction, suitable for moving/sliding parts
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Added Release Agent: Contains release agent for easier demolding
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Regulatory Compliant: Meets RoHS, PFOS, PFOA, BgVV, and FMVSS 302 requirements
Related Products
Hostaform C 13021 – Standard High Rigidity POM Copolymer
Hostaform C 13021 XAP – Easy Flow Low Emission POM
Hostaform C 27021 XAP C – FDA Compliant POM for Consumer Packaging
Hostaform C 27021 AS – Very Easy Flow Antistatic POM
Zytel ST801UV NC010 – Super Tough UV Stabilized PA66
Hostaform C 27021 XAP2 Applications
Automotive Interior: Components requiring very low emissions (VDA 275 < 2 mg/kg for natural grades)
Precision Engineering: Gears, bearings, sliding elements requiring high precision, dimensional stability, and good wear resistance
Electric & Electronic Industry: Connectors, relays, switches, coil formers requiring good electrical insulation and flow characteristics
Domestic Appliances: Gears, pump components, and moving parts in household appliances
Injection Molded Complex Parts: Thin-wall and complex geometries enabled by easy flow characteristics
Hostaform C 27021 XAP2 Technical Specifications
| Property | Test Condition | Standard | Value | Unit |
|---|---|---|---|---|
| Density | 23°C | ISO 1183 | 1.41 | g/cm³ |
| Water Absorption | Saturation, 23°C | ISO 62 | 0.65 | % |
| Humidity Absorption | 2mm, 50% RH | Sim. to ISO 62 | 0.20 | % |
| MVR (Melt Volume Rate) | 190°C/2.16kg | ISO 1133 | 24 | cm³/10min |
| Tensile Modulus | 23°C | ISO 527 | 2,750 | MPa |
| Tensile Stress at Yield | 23°C, 50mm/min | ISO 527 | 64 | MPa |
| Tensile Strain at Yield | 23°C, 50mm/min | ISO 527 | 7.5 | % |
| Nominal Strain at Break | 23°C, 50mm/min | ISO 527 | 17 | % |
| Flexural Modulus | 23°C | ISO 178 | 2,600 | MPa |
| Tensile Creep Modulus (1h) | — | ISO 899-1 | 2,400 | MPa |
| Tensile Creep Modulus (1000h) | — | ISO 899-1 | 1,200 | MPa |
| Charpy Notched Impact | 23°C | ISO 179/1eA | 5.5 | kJ/m² |
| Charpy Notched Impact | -30°C | ISO 179/1eA | 5.5 | kJ/m² |
| Charpy Unnotched Impact | 23°C | ISO 179/1eU | 170 | kJ/m² |
| Charpy Unnotched Impact | -30°C | ISO 179/1eU | 170 | kJ/m² |
| Poisson’s Ratio | — | — | 0.37 | — |
| Melting Temperature | 10°C/min | ISO 11357-3 | 164 | °C |
| CLTE (Parallel) | — | 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 | 20/50 | ×10⁻⁴ |
| CTI (Comparative Tracking Index) | — | IEC 60112 | 600 | V |
| UL Flammability | — | UL-94 | HB | — |
| FMVSS Burning Rate | 1mm | FMVSS 302 | <100 | mm/min |
| Emission (VDA 275) | Natural grades | VDA 275 | <2 | mg/kg |
| Emission (VDA 275) | Colored grades | VDA 275 | <5 | mg/kg |
Processing Guide
| Parameter | Recommended Value |
|---|---|
| Drying Recommended | Yes |
| Drying Temperature | 100 – 120°C |
| Drying Time (Dehumidified Dryer) | 3 – 6 hours |
| Max. Moisture Content | ≤ 0.2% |
| Melt Temperature Optimum | 190 – 200°C |
| Melt Temperature Range | 180 – 210°C |
| Mold Temperature Optimum | 100°C |
| Mold Temperature Range | 80 – 120°C |
| Hold Pressure Range | 60 – 120 MPa (600 – 1200 bar) |
| Back Pressure | ~4 MPa |
| Max Screw Tangential Speed | ≤0.3 m/s |
| Screw L/D Ratio | 15:1 – 25:1 |
| Feed Temperature | 60 – 80°C |
Hostaform C 27021 XAP2 FAQ
Q: What is Hostaform C 27021 XAP2?
A: Hostaform C 27021 XAP2 is an easy flow, low emission POM copolymer from Celanese for injection molding applications, especially automotive interior components. XAP2 stands for Advanced Processing with second-generation improved formulation.
Q: What does “XAP2” mean in the grade name?
A: “XAP” stands for Advanced Processing, indicating the material offers enhanced flow and processing characteristics. “XAP2” denotes an improved second-generation formulation.
Q: What are the emission levels of this material?
A: Natural grades of Hostaform C 27021 XAP2 have VDA 275 emission levels below 2 mg/kg, while colored grades are below 5 mg/kg.
Q: What is the flow rate of Hostaform C 27021 XAP2?
A: It offers MVR of 24 cm³/10min at 190°C/2.16kg – easy flow for complex parts.
Q: What is the tensile modulus of Hostaform C 27021 XAP2?
A: It offers tensile modulus of 2,750 MPa.
Q: What is the impact strength of this material?
A: It offers Charpy notched impact of 5.5 kJ/m² at both 23°C and -30°C.
Q: What automotive specifications does this material meet?
A: It meets FMVSS 302 burning rate standards (<100 mm/min at 1mm thickness) and has very low VDA 275 emissions.
Q: Is drying required before processing?
A: Yes, drying is recommended. Use a dehumidified dryer at 100–120°C for 3–6 hours to achieve maximum moisture content below 0.2%.
Q: What are the recommended processing conditions?
A: Melt temperature 180–210°C (optimum 190–200°C), mold temperature 80–120°C (optimum 100°C), with holding pressure 60–120 MPa.
