Of instruments and apparatus of subheading 9027.20, 9027.30, 9027.50, 9027.81 or 9027.89
Instruments and apparatus for physical or chemical analysis (for example, polarimeters, refractometers, spectrometers, gas or smoke analysis apparatus); instruments and apparatus for measuring or checking viscosity, porosity, expansion, surface tension or the like; instruments and apparatus for measuring or checking quantities of heat, sound or light (including exposure meters); microtomes; parts and accessories thereof: > Microtomes; parts and accessories: > Parts and accessories: > Other: > Of optical instruments and apparatus: > Of instruments and apparatus of subheading 9027.20, 9027.30, 9027.50, 9027.81 or 9027.89
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.05, 9903.88.06, 9903.88.07, 9903.88.08, 9903.88.10, 9903.88.11, 9903.88.14, 9903.88.19, 9903.88.50, 9903.88.52, 9903.88.58, 9903.88.60, 9903.88.62, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(a) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(b) [to this subchapter]
Products classified under HTS 9027.90.64.00
Spectrophotometer Quartz Cuvette
Precision quartz cuvettes designed for use in UV-Vis spectrophotometers of subheading 9027.30 to hold liquid samples during absorbance measurements. Made from high-purity quartz for optical transparency in UV range, these cuvettes are essential accessories for accurate spectroscopic analysis. Classified under 9027.90.64.00 as parts of optical analysis instruments.
Refractometer Prism Assembly
Sapphire prism assemblies for Abbe refractometers (9027.20) that measure refractive index through critical angle optics. These precision-ground prisms provide the optical interface for sample analysis in food, pharmaceutical, and chemical testing. Falls under 9027.90.64.00 as dedicated parts of optical refractometers.
Polarimeter Sample Cell
Glass sample cells with precise path lengths (10mm, 20mm, 50mm) for optical polarimeters (9027.50) measuring optical rotation. Features anti-reflective coatings and temperature control jackets for pharmaceutical sugar analysis. Classified as 9027.90.64.00 parts of optical polarimetry instruments.
Fluorometer Flow Cell
Quartz flow cells for fluorescence spectrophotometers (9027.30) with sub-micron path lengths for continuous sample analysis. Black-coated exteriors minimize stray light in sensitive fluorescence detection. 9027.90.64.00 classification for optical fluorometer accessories.
Colorimeter Calibration Filter Set
Certified colored glass filter sets for colorimeter (9027.30) wavelength and absorbance calibration per NIST standards. Filters at 436nm, 546nm, 660nm ensure instrument accuracy for water quality testing. Parts of optical analysis instruments under 9027.90.64.00.
Turbidimeter Light Shield Assembly
Black Delrin light shield assemblies for nephelometric turbidimeters (9027.30 optical type) preventing ambient light interference. Precision alignment features ensure LED light path integrity. Classified 9027.90.64.00 as optical instrument accessories.
Photometer Lamp Housing
Precision aluminum housings for tungsten-halogen lamps in clinical photometers (9027.30), featuring heat dissipation fins and optical alignment ports. Ensures stable light source for biochemical analysis. 9027.90.64.00 parts of optical analyzers.
Optical Encoder Disk for Spectrometer
Chrome-on-glass encoder disks with 3600 lines/mm resolution for grating position feedback in scanning spectrophotometers (9027.30). Provides sub-arcsecond wavelength accuracy. Essential optical positioning component under 9027.90.64.00.
Gas Chromatograph Optical Window
Sapphire windows for flame ionization detectors (FID) in GC systems (9027.90 optical components), transmitting UV for ionization efficiency. Withstands 400°C combustion temperatures. Parts of optical chromatographic instruments.
Microplate Reader Filter Wheel
Motorized 8-position interference filter wheels for ELISA plate readers (9027.30), 340-750nm bandpass filters for multi-wavelength absorbance. Precision optics alignment for 96-well plates. 9027.90.64.00 classification.
Nephelometer Photomultiplier Housing
Light-tight aluminum housings for PMT detectors in nephelometric turbidity meters (9027.30 optical). Magnetic shielding reduces interference in low-level light detection. Critical optical component under 9027.90.64.00.
UV-Vis Detector Flow Cell Holder
Precision alignment holders for HPLC UV-Vis detector flow cells (9027.30), with micrometer X-Y-Z adjustments. Ensures sub-micron optical path registration. Essential accessory for optical chromatography detectors.
Spectrometer Sample Compartment Door
Interlock-equipped sample compartment doors for double-beam spectrophotometers (9027.30) with quartz windows. Safety interlocks prevent lamp operation during access. Optical instrument enclosure component.
Reflectance Probe Holder Assembly
Fiber-optic reflectance probe holders for diffuse reflectance spectrometers (9027.30), adjustable 30-60° incident angles. Aluminum construction with SMA connector ports. Precision optics positioning accessory.
Emission Spectrometer Nebulizer Adapter
Quartz nebulizer adapters for ICP-OES emission spectrometers (9027.30 optical emission), 1-2 mL/min flow optimization. Withstands plasma temperatures >6000K. Critical sample introduction optics component.