Sabic LEXAN™ PC Resin OQ3820
Plastic Granules
SABIC Lexan OQ3820 UV-stabilized
LEXAN™ OQ3820 resin is a 7.4 MFR polycarbonate, MVR of 6. UV stabilized. High viscosity, superior optical clarity and robust performance. Designed for ophthalmic lenses.
Typical property data
Physical Properties
- Specific Gravity: 1.19 (ASTM D792)
- Density: 1.2 g/cm³ (ISO 1183)
- Mold Shrinkage (flow): 0.6–0.8% (SABIC method)
- Mold Shrinkage (xflow): 0.5–0.7% (SABIC method)
- Melt Flow Rate (300°C/1.2 kgf): 7.4 g/10 min (ASTM D1238)
- Melt Volume Rate (MVR at 300°C/1.2 kg): 6 cm³/10 min (ISO 1133)
- Water Absorption (23°C/saturated): 0.32% (ISO 62-1)
- Moisture Absorption (23°C / 50% RH): 0.15% (ISO 62)
Mechanical Properties
- Tensile Stress (yield): 62 MPa (ASTM D638) / 61 MPa (ISO 527)
- Tensile Stress (break): 72 MPa (ASTM D638) / 71 MPa (ISO 527)
- Tensile Strain (yield): 6.3% (ASTM D638) / 6% (ISO 527)
- Tensile Strain (break): 125% (ASTM D638) / 140% (ISO 527)
- Tensile Modulus: 2270 MPa (ASTM D638) / 2400 MPa (ISO 527)
- Flexural Stress (yield): 93 MPa (ASTM D790) / 94 MPa (ISO 178)
- Flexural Modulus: 2410 MPa (ASTM D790) / 2200 MPa (ISO 178)
Impact Properties
- Izod Impact, Notched (23°C): 918 J/m (ASTM D256) / 70 kJ/m² (ISO 180/1A)
- Izod Impact, Notched (-30°C): 14 J/m (ASTM D256) / 12 kJ/m² (ISO 180/1A)
- Instrumented Dart Impact (Total Energy, 23°C): 85 J (ASTM D3763)
- Charpy Impact, V-notch (23°C): 75 kJ/m² (ISO 179/1eA)
- Charpy Impact, V-notch (-30°C): 15 kJ/m² (ISO 179/1eA)
Thermal Properties
- Vicat Softening Temperature (Rate B/50): 150°C (ASTM D1525) / 143°C (ISO 306)
- HDT (0.45 MPa, unannealed): 139°C (ASTM D648)
- HDT (1.82 MPa, unannealed): 129°C (ASTM D648)
- Coefficient of Thermal Expansion (CTE, flow): 7.74×10−5 1/°C7.74 \times 10^{-5} \, \text{1/°C} (ASTM E831) / 7.6×10−5 1/°C7.6 \times 10^{-5} \, \text{1/°C} (ISO 11359-2)
- Coefficient of Thermal Expansion (CTE, xflow): 7.74×10−5 1/°C7.74 \times 10^{-5} \, \text{1/°C} (ASTM E831) / 7.89×10−5 1/°C7.89 \times 10^{-5} \, \text{1/°C} (ISO 11359-2)
- Ball Pressure Test (75°C): Passed (IEC 60695-10-2)
Injection Molding
- Drying Temperature: 120°C
- Drying Time: 3–4 hours
- Maximum Moisture Content: 0.02%
- Melt Temperature: 310–330°C
- Nozzle Temperature: 305–325°C
- Mold Temperature: 80–115°C
- Back Pressure: 0.3–0.7 MPa
- Screw Speed: 40–70 rpm
- Shot to Cylinder Size: 40–60%
- Vent Depth: 0.025–0.076 mm
Features & Benefits
Superior Optical Clarity & Stability
LEXAN OQ3820 offers excellent transparency and UV stabilization, ensuring long-term clarity and color stability for lenses that remain visually perfect under prolonged light exposure.
Durability and Impact Resistance
With high notched Izod impact strength, this resin provides outstanding toughness and reliability, reducing breakage risks in finished ophthalmic products and enhancing user safety.
Optimized for Precision Molding
Its consistent flow and controlled shrinkage allow for precise, repeatable molding of complex lens geometries, improving manufacturing yield and part quality.
