OKP Osaka Gas Chemicals OKPA2 Optical Plastic, 1.661 Refractive Index – 25 kg bag

Osaka Gas Chemicals OKP Optical Plastics are high-purity, optically clear thermoplastics specifically designed for injection molding of high-performance optical components, such as phone and camera lenses and display backlights. OKP materials offer a high refractive index and light transmittance comparable to optical-grade polycarbonate. They also provide high heat resistance to withstand lead-free soldering processes and demonstrate excellent optical and thermal stability.

Properties and Melt Flow Rate:

• Refractive Index: 1.661
• Abbe Number: 20.4
• Visible Light Transmittance (%-T at 1mm): 90%
• Birefringence (OGC Method, nm ×10⁻⁴): 9
• Melt Flow Rate (MFR, 230°C/2.16kg): 2 g/10 min

Physical and Mechanical Properties:

• Glass Transition Temperature (Tg): 144°C (291.2°F)
• Heat Deflection Temperature (HDT, 1.80 MPa): 130°C (with annealing)
• Water Absorption (24 hours): 0.08%
• Tensile Strength: 78 MPa
• Coefficient of Thermal Expansion (CTE): 6.0 × 10⁻⁵/°C