Calcium Fluoride Window
An unmounted flat optical window made of calcium fluoride (CaF2) for infrared spectroscopy and laser systems. Falls under HTS 9001.90.90.00 as a non-glass optical element transmitting in UV-IR spectrum. Used unprotected in optical paths requiring high purity.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If glass equivalent like BK7
Glass windows, worked or not, stay in 9001.20; crystalline materials like CaF2 go to 'other'.
If for laboratory crucibles, not optical
Chapter 90 excludes non-optical ceramic labware; function determines optical vs technical use.
If assembled into lens mounts
Mounted optical flats become 'other optical appliances' under 9002.90.
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Import Tips & Compliance
• Supply transmission curve data proving IR/UV optical properties to avoid Chapter 69 ceramic classification
• Document scratch-dig specifications (e.g
• 40-20) confirming optical workmanship standards
• For AR-coated versions, verify if coating changes classification to mounted assemblies
Related Products under HTS 9001.90.90.00
Fused Silica Plano-Convex Lens
A high-precision plano-convex lens made from fused silica, used in laser systems and optical instruments for focusing light. It falls under HTS 9001.90.90.00 as an unmounted optical element of a material other than unworked glass, designed for precise beam manipulation. The lens is supplied individually without mounting for integration into various optical assemblies.
Sapphire Prism
A right-angle prism crafted from synthetic sapphire (aluminum oxide), ideal for UV and harsh environment optics in spectroscopy and defense applications. Classified under HTS 9001.90.90.00 as an unmounted optical element of non-glass material, prized for its hardness and transmission properties. Delivered unmounted for custom system integration.
Polymer Optical Fiber Bundle
A bundle of polymer optical fibers used for illumination and image transmission in endoscopes and sensors. It qualifies under HTS 9001.90.90.00 as optical fiber bundles distinct from electrical cables of 8544, unmounted for device assembly. Essential for medical and industrial imaging applications.
Polarizing Film Sheet
Sheets of polarizing material, typically PVA with iodine crystals, used in LCD displays and sunglasses. Classified in HTS 9001.90.90.00 as plates of polarizing material, unmounted for lamination into devices. Controls light polarization in optical systems.
Germanium Meniscus Lens
A meniscus lens made from germanium crystal for thermal imaging and CO2 laser optics in the 8-14μm IR range. HTS 9001.90.90.00 covers this unmounted semiconductor optical element. Critical for night vision and FLIR systems.
Silicon Aspheric Lens
Precision aspheric lens molded from optical-grade silicon for mid-IR applications like FTIR spectrometers. Under HTS 9001.90.90.00 as unmounted non-glass optical element with complex surface for aberration correction. Used in analytical instruments.