Sabic LEXAN™ PC Resin 221R
Lexan 221R Flame Retardant Grade
Sabic LEXAN™ 221R resin is an 18 MFR, flame-retardant polycarbonate (UL94 V2 rated) with built-in mold release. It offers an excellent balance of high impact strength, clarity, and thermal stability.
Typical property data
Physical Properties
- Specific Gravity: 1.20 (ASTM D792)
- Density: 1.19 g/cm³ (ASTM D792)
- Water Absorption (23°C/24 hrs): 0.15% (ASTM D570)
- Water Absorption (23°C/Saturated): 0.35% (ASTM D570)
- Melt Flow Rate (300°C/1.2 kgf): 17.5 g/10 min (ASTM D1238)
Mechanical Properties
- Tensile Stress (Yield, Type I, 50 mm/min): 62 MPa (ASTM D638)
- Tensile Stress (Break, Type I, 50 mm/min): 68 MPa (ASTM D638)
- Tensile Strain (Yield, Type I, 50 mm/min): 7% (ASTM D638)
- Tensile Strain (Break, Type I, 50 mm/min): 125% (ASTM D638)
- Flexural Stress (Yield, 1.3 mm/min, 50 mm span): 96 MPa (ASTM D790)
- Flexural Modulus: 2340 MPa (ASTM D790)
- Hardness (Rockwell M): 70 (ASTM D785)
- Hardness (Rockwell R): 118 (ASTM D785)
Impact Properties
- Izod Impact (Unnotched, 23°C): 3204 J/m (ASTM D4812)
- Izod Impact (Notched, 23°C): 694 J/m (ASTM D256)
- Falling Dart Impact (23°C): 169 J (ASTM D3029)
Thermal Properties
- Vicat Softening Temperature (Rate B/50): 154°C (ASTM D1525)
- Heat Deflection Temp (0.45 MPa, unannealed): 137°C (ASTM D648)
- Heat Deflection Temp (1.82 MPa, unannealed): 129°C (ASTM D648)
- Thermal Conductivity: 0.25 W/m-°C (ASTM C177)
- Coefficient of Thermal Expansion (-40°C to 95°C): 6.84E-05 1/°C (ASTM E831)
Optical Properties
- Light Transmission (2.54 mm): 88% (ASTM D1003)
- Haze (2.54 mm): 1% (ASTM D1003)
- Refractive Index: 1.586 (ASTM D542)
Electrical Properties
- Volume Resistivity: >1.E+17 Ω·cm (ASTM D257)
- Dielectric Strength (3.2 mm): 14.9 kV/mm (ASTM D149)
- Relative Permittivity (50/60 Hz): 3.17 (ASTM D150)
- Dissipation Factor (50/60 Hz): 0.0009 (ASTM D150)
Flame Characteristics
- UL 94V-2 Rating: 1.09 mm (UL 94)
- UL 94V-0 Rating: 5.99 mm (UL 94)
- UV-Light, Water Immersion: F2 (UL 746C)
Injection Molding
- Drying Temperature: 120°C
- Drying Time: 3 – 4 Hours
- Maximum Moisture Content: 0.02%
- Melt Temperature: 280 – 305°C
- Mold Temperature: 70 – 95°C
- Back Pressure: 0.3 – 0.7 MPa
- Screw Speed: 40 – 70 rpm
Features & Benefits
Inherent Flame Retardant Safety
This LEXAN 221R grade is UL94 V2 recognized, providing a critical level of fire resistance. This built-in safety feature is essential for electronics housings and interior components.
Exceptional Toughness & Durability
With its very high impact resistance, LEXAN Resin 221R withstands sudden drops and impacts. This translates to longer-lasting products, reduced breakage during assembly or use, and enhanced reliability.
High Clarity with Processing Ease
The material offers over 88% light transmission with low haze, ideal for lenses, covers, or indicators requiring visibility. The included mold release agent and specified drying profile facilitate smoother production cycles.
Use & Applications
- Consumer Electronics Housings
- Electrical Components
- Automotive Interior Parts
- Enclosures and Covers for Lighting and Indicators
- Various Industrial and Consumer Durables