Right Angle Prism
A right angle prism made of optical glass with polished surfaces used to redirect light beams by 90 degrees through total internal reflection. It falls under HTS 9001.90.50.00 as an unmounted optical prism designed for beam deviation in laboratory and industrial optical systems. These prisms are essential components in periscopes, binoculars, and laser systems.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If mounted in a metal or plastic housing
Mounted prisms become optical instruments or appliances under heading 9002, no longer classified as unmounted elements.
If made of glass not optically worked
Chapter note excludes glass prisms lacking optical working (polishing to lambda/4 or better) from heading 9001.
If specifically designed as machine part for semiconductor equipment
Parts for machines of chapter 84 take precedence over optical element classification per chapter note 1(f).
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Import Tips & Compliance
• Verify optical material specifications and provide certificates confirming polish quality meets unmounted optical element standards
• Include detailed technical drawings showing prism geometry and intended optical function to avoid misclassification as worked glass
• Ensure packaging prevents surface scratches, as customs inspections may reject damaged optical surfaces
Related Products under HTS 9001.90.50.00
Equilateral Dispersion Prism
An equilateral prism typically made of flint glass used for dispersing white light into its spectral components in spectrophotometers and educational optics kits. Classified under HTS 9001.90.50.00 as an unmounted optical element specifically engineered for chromatic dispersion. Provides high dispersion for separating wavelengths in analytical instruments.
Penta Prism
A penta prism made of N-BK7 glass that deviates an incident beam by exactly 90 degrees regardless of prism orientation, used in viewfinders and precision alignment systems. Falls under HTS 9001.90.50.00 as an unmounted optical prism with roof surfaces for maintaining image orientation. Critical component maintaining constant deviation angle in surveying instruments.
Dove Prism
A Dove prism used for image rotation in optical systems, featuring a 45-degree cut angle and total internal reflection on elongated faces. Classified under HTS 9001.90.50.00 as an unmounted optical prism for precision image orientation control. Essential in polarization microscopes and aerial photography systems.
Porro Prism
Pair of right-angle prisms arranged to invert and revert images in binoculars, providing upright viewing with wide field of view. Falls under HTS 9001.90.50.00 when imported unmounted as individual optical elements rather than assembled binocular sets. Enables stereoscopic vision in field glasses and spotting scopes.
Amici Roof Prism
A compound prism combining right-angle reflection with roof prism functionality for erecting images in compact optical instruments. Classified under HTS 9001.90.50.00 as an unmounted optical prism featuring both total internal reflection and roof reflection surfaces. Used in compact binoculars and prism binoculars.
Wollaston Prism
A birefringent prism composed of two calcite prisms cemented together to separate orthogonally polarized light beams. Falls under HTS 9001.90.50.00 as an unmounted optical prism for polarization applications in microscopy and ellipsometry. Produces widely separated ordinary and extraordinary beams for polarimetric analysis.