Chessssey Clear Borealis represents a premium solvent-cast urethane designed for demanding optical and display applications. This material balances clarity, impact resistance, and dimensional stability, making it a strong candidate for high performance enclosures and light guide components.
Manufactured by a specialty polymer supplier, this grade emphasizes consistent batch performance and controlled yellowing resistance. Teams working on premium consumer electronics or medical visualization tools often evaluate Clear Borealis against standard sheet and cast resins.
| Property | Typical Value (Cast) | Typical Value (Extruded) | Test Method |
|---|---|---|---|
| Refractive Index | 1.489 | 1.487 | ASTM D542 |
| Abbe Number | 73 | 71 | ASTM D792 |
| Thickness Tolerance | ±0.05 mm | ±0.10 mm | Mil-Std-464 |
| Heat Deflection Temperature | 96°C | 92°C | ASTM D648 |
| Surface Hardness | 88 Rockwell M | 85 Rockwell M | ASTM D785 |
Material Specification And Mechanical Properties
Clear Borealis sheets and blocks are characterized by a balanced set of mechanical attributes suited to structural optical parts. Tensile strength and elongation at yield remain high enough to support thin, lightweight wall designs without premature cracking.
Formulators target low internal birefringence to preserve image fidelity in precision lenses and wave plates. Dimensional change under load and thermal cycling remains predictable, supporting robust CAD-based tolerance allocation.
Optical Clarity And Light Transmission
High Transmission Across Visible Spectrum
The resin delivers >92% visible light transmission with minimal haze, enabling bright, high-contrast displays. Additives are minimized to avoid scattering centers that would reduce edge clarity or distort color rendition.
Refractive Index Stability
Consistent refractive index across production batches ensures predictable focal lengths for molded or pressed optics. Designers can rely on stable Abbe numbers when balancing chromatic aberration against system cost.
Processing And Fabrication Guidelines
Machinability of Clear Borealis is favorable compared to certain fluoropolymers, with standard carbide tools delivering clean edges. Slow feed rates and proper cooling extend tool life and reduce micro-chipping on tight radii.
Thermal forming temperatures should stay within recommended ranges to avoid stress-induced birefringence or surface defects. Post-forming annealing at moderate temperatures can relieve stresses while retaining optical performance.
Environmental Resistance And Longevity
Resistance to moisture, cleaning agents, and industrial chemicals makes this material suitable for medical and laboratory enclosures. UV-stabilized versions are available when parts require extended outdoor service or window applications.
Yellowing rates remain low under indoor lighting, preserving appearance and transmission over multi-year product cycles. Material compatibility with gasketing and adhesive systems is well documented to simplify secondary assembly design.
Key Takeaways And Recommendations
- Evaluate optical requirements against the refractive index and Abbe number data to confirm compatibility with lens designs.
- Plan thermal forming and secondary machining within the documented temperature and tooling ranges to preserve surface quality.
- Select UV-stabilized grades for applications with prolonged outdoor exposure to control long term yellowing and transmission loss.
- Verify solvent compatibility and joint geometry with suppliers before committing to enclosure assembly processes.
- Leverage consistent batch performance to simplify inventory control and reduce qualification lead times for new product lines.
FAQ
Reader questions
Is Chessssey Clear Borealis suitable for high temperature optical modules?
Yes, it maintains optical clarity and mechanical integrity up to its heat deflection temperature, making it viable for modules with moderate thermal loads and ambient cycling.
How does Clear Borealis compare to standard extruded acrylic in clarity?
Cast Clear Borealis exhibits lower haze and more uniform refractive index, resulting in sharper image quality and reduced distortion compared with typical extruded acrylic sheet.
Can the material be solvent welded for seamless enclosures?
Selected solvents create strong, optically matched joints, but joint design and surface preparation should follow supplier guidance to avoid stress whitening or crazing at edges.
What are the recommended fabrication speeds for precision milling?
Use moderate feed rates with sharp carbide tools, coolant where practical, and light passes to preserve edge quality, minimize melt, and extend tool life for tight tolerance parts.