CHAPTER 90 · LEGAL NOTES
Chapter 90
The 307 legal notes below govern classification under Chapter 90. They are part of the official Harmonized Tariff Schedule and are cited verbatim in CBP rulings.
As of June 9, 2026
Chapter notes
Note 1
Chapter Note 1: This chapter does not cover: (a) Articles of a kind used in machines, appliances or for other technical uses, of vulcanized rubber other than hard rubber (heading 4016), of leather or of composition leather (heading 4205) or of textile material (heading 5911); (b) Supporting belts or other support articles of textile material, whose intended effect on the organ to be supported or held derives solely from their elasticity (for example, maternity belts, thoracic support bandages, abdominal support bandages, supports for joints or muscles) (section XI); (c) Refractory goods of heading 6903; ceramic wares for laboratory, chemical or other technical uses, of heading 6909; (d) Glass mirrors, not optically worked, of heading 7009, or mirrors of base metal or of precious metal, not being optical elements (heading 8306 or chapter 71); (e) Goods of heading 7007, 7008, 7011, 7014, 7015 or 7017;
Note 2
Chapter Note 2: Subject to note 1 above, parts and accessories for machines, apparatus, instruments or articles of this chapter are to be classified according to the following rules: (a) Parts and accessories which are goods included in any of the headings of this chapter or of chapter 84, 85 or 91 (other than heading 8487, 8548 or 9033) are in all cases to be classified in their respective headings; (b) Other parts and accessories, if suitable for use solely or principally with a particular kind of machine, instrument or apparatus, or with a number of machines, instruments or apparatus of the same heading (including a machine, instrument or apparatus of heading 9010, 9013 or 9031) are to be classified with the machines, instruments or apparatus of that kind; (c) All other parts and accessories are to be classified in heading 9033.
Note 3
Chapter Note 3: The provisions of notes 3 and 4 to section apply also to this chapter.
Note 4
Chapter Note 4: Heading 9005 does not apply to telescopic sights for fitting to arms, periscopic telescopes for fitting to submarines or tanks, or to telescopes for machines, appliances, instruments or apparatus of this chapter or section XVI; such telescopic sights and telescopes are to be classified in heading 9013.
Note 5
Chapter Note 5: Measuring or checking optical instruments, appliances or machines which, but for this note, could be classified both in heading 9013 and in heading 9031 are to be classified in heading 9031.
Note 6
Chapter Note 6: For the purposes of heading 9021, the expression “orthopedic appliances” means appliances for: (a) Preventing or correcting bodily deformities; or (b) Supporting or holding parts of the body following an illness, operation or injury. Orthopedic appliances include footwear and special insoles designed to correct orthopedic conditions, provided that they are either (1) made to measure or (2) mass-produced, entered singly and not in pairs and designed to fit either foot equally.
Note 7
Chapter Note 7: Heading 9032 applies only to: (a) Instruments and apparatus for automatically controlling the flow, level, pressure or other variables of liquids or gases, or for automatically controlling temperature, whether or not their operation depends on an electrical phenomenon which varies according to the factor to be automatically controlled, which are designed to bring this factor to, and maintain it at, a desired value, stabilized against disturbances, by constantly or periodically measuring its actual value; and (b) Automatic regulators of electrical quantities, and instruments or apparatus for automatically controlling non-electrical quantities the operation of which depends on an electrical phenomenon varying according to the factor to be controlled, which are designed to bring this factor to, and maintain it at, a desired value, stabilized against disturbances, by constantly or periodically measuring its actual value.
Additional U.S. notes
Note 1
Additional U.S. Note 1: For the purposes of headings 9001 and 9002, the term "optically worked" refers to glass the surface of which has been ground or polished in order to produce the required optical properties.
Note 2
Additional U.S. Note 2: For the purposes of this chapter, the term "electrical" when used in reference to instruments, appliances, apparatus and machines, refers to those articles the operation of which depends on an electrical phenomenon which varies according to the factor to be ascertained.
Note 3
Additional U.S. Note 3: For the purposes of this chapter, the terms "optical appliances"and"optical instruments" refer only to those appliances and instruments which incorporate one or more optical elements, but do not include any appliances or instruments in which the incorporated optical element or elements are solely for viewing a scale or for some other subsidiary purpose.
Note 4
Additional U.S. Note 4: For the purposes of this chapter, the term "printed circuit assembly"means goods consisting of one or more printed circuits of heading 8534 with one or more active elements assembled thereon, with or without passive elements. For the purposes of this note,"active elements" means diodes, transistors and similar semiconductor devices, whether or not photosensitive, of heading 8541, and integrated circuits of heading 8542.
Statistical notes
Note 1
Statistical Note 1: For statistical reporting purposes under subheading 9001.10, the unit of quantity "fiber m", as it pertains to optical fiber bundles and cables, is determined by multiplying the number of individual fibers contained therein by the length in meters.
Note 2
Statistical Note 2: For the purposes of statistical reporting number 9025.19.8010, “clinical infrared thermometers” are devices designed to be used to check the body temperatures of humans and animals. Unit Rates of Duty of Quantity Article Description Stat. Suffix Heading/ Subheading 1 2 General Special Optical fibers and optical fiber bundles; optical fiber cables other than those of heading 8544; sheets and plates of polarizing material; lenses (including contact lenses), prisms, mirrors and other optical elements, of any material, unmounted, other than such elements of glass not optically worked: 9001
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See 9903.88.01.
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See 9903.88.01.
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See 9903.88.01.
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See 9903.88.01 and U.S. note 19 to subchapter III, chapter 99.
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See 9903.88.01.
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See 9903.88.69.
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Classify under Chapter 90 with confidence
TariffLens applies the legal notes above automatically when classifying — citing the relevant note in every GRI reasoning chain.