OKP Osaka Gas Chemicals OKP V1 Optical Plastic, 1.637 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: 1.637
• Abbe Number: 22.8
• Visible Light Transmittance (%-T at 1mm): 90
• Birefringence (OGC Method, nm ×10⁻⁴): 34
• Melt Flow Rate (MFR, 230°C/2.16kg): 2

Physical and Mechanical Properties:

• Glass Transition Temperature (Tg): 149°C (300.2°F)
• Heat Deflection Temperature (HDT, 1.80 MPa): 139°C (with annealing)
• Water Absorption (24 hours): 0.11%
• Tensile Strength: 65 MPa
• Coefficient of Thermal Expansion (CTE): 6.1 × 10⁻⁵/°C