Optical Grade PC

Optical Grade PC (Polycarbonate) is engineered for maximum light transmission and minimal haze, making it the premier choice for transparent components. It combines the legendary impact toughness of polycarbonate with the clarity of glass, without the weight or fragility. Jucheng Precision specializes in the ultra-precision machining of optical PC, utilizing high-speed 5-axis milling and specialized vapor polishing to achieve glass-like finishes. Our expertise in producing complex light guides, lenses, and medical sight glasses ensures your optical components deliver perfect light refraction and crystal-clear visibility for critical automotive, medical, and aerospace applications.

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Optical PC Machining

Polycarbonate (PC) Material Variants

Grade Common Name Key Characteristics Typical Applications
Optical Grade PC Lexan® / Makrolon® Highest light transmission and lowest haze. Optimized for optical clarity and vapor polishing. Lenses, light pipes, windows, automotive lighting, protective visors.
Machine Grade PC Stress-Relieved PC Annealed to reduce internal stress. Best for machining tight tolerances in complex structural parts. Manifolds, structural housings, semiconductor nests.
Glass-Filled PC PC GF10 / GF20 Reinforced with glass fibers for significantly higher stiffness and heat resistance. Non-transparent. Industrial brackets, internal structural frames.

Optical Grade PC Machining Capabilities

Capability Technical Description Jucheng Advantage
Vapor Polishing Chemical vapor treatment that melts the surface at a microscopic level to restore 100% transparency. We achieve optical-grade clarity on complex curved lenses and internal ports where manual polishing is impossible.
Micro-Milling Light Guides Milling fine grooves and prisms for light refraction with extremely small step-overs. Our high-speed spindles (up to 30,000 RPM) ensure burr-free edges and sharp prism peaks for maximum light efficiency.
Precision Diamond Turning Utilizing specialized diamond tools to achieve mirror surface finishes directly off the machine. Reduces post-processing time and ensures the highest geometric accuracy for spherical and aspherical lenses.
Anti-Scratch Coating Prep Machining and cleaning surfaces to prepare for secondary hard-coat or anti-reflective (AR) treatments. Jucheng provides a clean-room style finishing environment to ensure optical parts are free from dust and contaminants.

Fabrication Guidelines for Optical Grade PC

Clarity Maintenance:
Tool marks are highly visible in optical parts. Tip: We use a very small step-over (0.05mm or less) during the finishing pass to minimize tool lines, making the subsequent vapor polishing process more effective.

Scratch Protection:
Optical PC is relatively soft and scratches easily. Tip: We apply protective adhesive masking immediately after machining and keep the workspace meticulously clean to prevent surface damage.

Coolant Selection:
Non-compatible coolants can turn optical PC cloudy or cause micro-cracking. Tip: We use only high-purity, plastic-safe water-soluble coolants or chilled air-blast cooling to maintain material transparency.

Annealing for Optics:
Internal stress can distort light paths (birefringence). Tip: We perform strictly controlled annealing cycles to ensure the light transmission properties are uniform throughout the part.

Primary Applications

Automotive Lighting
Prototype headlight lenses, interior light guides, and taillight covers requiring optical clarity and high impact resistance.

Medical Diagnostics
Sight glasses, flow cells, and clear reservoirs for blood analyzers where visual monitoring is critical.

Aerospace & Defense
Cockpit canopies, sensor windows, and camera lenses that must withstand high-speed impacts and thermal cycling.

Industrial Instrumentation
Pressure gauge covers, level indicators, and inspection windows for high-pressure fluid systems.

Properties

Density 1.20 g/cm³
Tensile Strength 60 - 70 MPa
Light Transmission 88 - 90%
Haze Value < 1.0%
Hardness 80 Rockwell M
Impact Strength 650 - 850 J/m
Refractive Index 1.586
Water Absorption 0.15%
Dielectric Strength 15 kV/mm
Max Part Size 2000 x 800 x 600 mm