Chapter 85 covers electrical machinery and equipment and parts thereof; sound recorders and reproducers, television image and sound recorders and reproducers, and parts and accessories of such articles. This chapter is the main chapter in the HS classification for technology-intensive products, covering a wide range of goods from household appliances to precision electronic components. As the fundamental carrier of electronic equipment, the classification logic of printed circuit boards is highly consistent with the 'electrical parts' attribute of this chapter, but attention must be paid to distinguishing them from parts of optical instruments in Chapter 90 and parts of automatic data processing equipment in Chapter 84. Heading 8534 specifically refers to printed circuit boards, i.e., products on which conductive circuits are formed on an insulating substrate through a specific process, used for connecting and supporting electronic components. This heading covers rigid boards, flexible boards, rigid-flex boards, etc., whether or not loaded with components (but once loaded, they may be classified under other headings). Its core characteristic is the conductive pattern formed by a 'printing' process, rather than traditional wiring or point-to-point connections. The first 2 digits '85' represent Chapter 85, i.e., electrical machinery and equipment and parts thereof. Digits 3-4 '34' represent heading 8534, specifically printed circuit boards. Digits 5-6 '00' indicate that there is no further subdivision under this heading, and all printed circuit boards are classified under this subheading. Therefore, the complete code 853400 represents 'printed circuit boards', regardless of the number of layers, material, or use (unless they constitute a complete machine or are assembled with components). This commodity is classified under 8534 rather than 8544 (insulated wire, cable) or 8537 (control panels, distribution boards), because the core function of a printed circuit board is to provide electrical connections and mechanical support, and its conductive circuits are formed by etching and other printing processes, rather than insulated wires or switch control devices. If components are already mounted and it constitutes a specific functional module, it may be classified under 8537 or 8543, etc.

Product Name: The standard name of the declared commodity; 'printed circuit board' or a specific type such as 'rigid printed circuit board' or 'flexible printed circuit board' should be filled in. Material: Refers to the substrate and conductive materials, such as 'epoxy resin glass cloth substrate, copper foil conductive layer'. Whether it contains a metal base, ceramic base, etc. must be indicated. Number of Layers: The number of conductive layers of the printed circuit board, such as single-sided, double-sided, multilayer (4-layer, 6-layer, etc.). The number of layers affects classification and value. Use: Refers to the application field of the printed circuit board, such as 'for computers', 'for mobile phones', 'for automotive electronics', etc. Brand: The manufacturer or brand name; if there is no brand, 'no brand' must be indicated. Model: The model or specification code of the product, used to identify the specific product. Whether Components Are Mounted: Refers to whether electronic components (such as resistors, capacitors, chips) have been installed on the printed circuit board. Being mounted may affect classification. Product Name: Multilayer printed circuit board; Material: Epoxy resin glass cloth substrate, copper foil conductive layer; Number of Layers: 6 layers; Use: For smartphone motherboard; Brand: No brand; Model: PCB-12345; Whether Components Are Mounted: Not mounted. Declaring a circuit board with mounted components under 8534, when it should actually be classified under 8537 or 8543, etc. Incorrect declaration of the number of layers, such as declaring a 4-layer board as double-sided, affecting classification and statistics. Filling in an overly general use, such as 'for electronic equipment', which may trigger customs questions.

The core basis for classification is the essential characteristics of the product: whether conductive circuits are formed on an insulating substrate through a printing process, and whether no components are mounted or, if mounted, they do not constitute the essential character of a complete machine. If components are mounted and it has an independent function, it is classified as a complete machine. At the same time, consideration must be given to whether material, number of layers, etc. affect the heading, but 8534 covers all printed circuit boards unless otherwise provided. 8537 Control panels, distribution boards, etc.: 8537 covers boards, panels, etc. equipped with multiple 8535 or 8536 apparatus, used for electrical control or power distribution. If a printed circuit board is already mounted with switches, relays, etc., and constitutes a control device, it is classified under 8537. 8543 Electrical equipment not specified elsewhere in this chapter: 8543 is a residual heading; if a printed circuit board is assembled with components and has an independent function and is not classified under other headings, it may be classified under 8543. 8544 Insulated wire, cable: 8544 is insulated conductors, while 8534 is printed circuit boards, whose conductive circuits are formed by etching, not insulated wires. 8473 Parts of automatic data processing equipment: 8473 is specifically for parts of computers and similar equipment. If a printed circuit board is a dedicated part for a computer and is not mounted with components, it may be classified under 8473, but usually 8534 takes precedence. 8517 Telephone sets and other communication equipment: 8517 covers complete communication equipment. If a printed circuit board is dedicated to communication equipment and is already assembled, it may be classified under 8517, but an unassembled board is still classified under 8534. Is the conductive circuit formed by a printing process? Are no components mounted, or if mounted, does it not constitute a complete machine? Is the substrate an insulating material? Is it used for electrical connection or mechanical support? Does it not belong to the insulated wire of 8544?

Printed circuit boards have multiple layer counts; will the HS code differ? No. HS code 853400 covers all printed circuit boards, regardless of the number of layers. The number of layers is only a declaration element and does not affect classification, but it may affect tariff rates or trade statistics. How are printed circuit boards with mounted components classified? If components are mounted and they constitute the essential character of a complete machine, it is classified as a complete machine, such as a computer motherboard under 8473 or a control board under 8537. If only a small number of components are mounted and it does not constitute a complete machine, it may still be classified under 8534. Are flexible printed circuit boards also classified under 8534? Yes. Flexible printed circuit boards (FPC) also belong to printed circuit boards and are classified under 8534. When declaring, 'flexible' and the substrate material must be indicated. How can I check the import tariff rate for printed circuit boards? Tariff rates vary by country, trade agreement, and origin. You can check the customs tariff of the destination country, or use official channels such as the WTO tariff database or the China Customs Import and Export Tariff. What is the difference between printed circuit boards and integrated circuits? Integrated circuits (HS 8542) integrate multiple components on a semiconductor substrate and have specific electronic functions; printed circuit boards are substrates that carry and connect components and do not themselves perform complex functions. What are common errors in the declaration elements for printed circuit boards during customs declaration? Common errors include: non-standard product names, incorrect declaration of the number of layers, overly general use, and failure to declare whether components are mounted. It is recommended to declare strictly in accordance with customs specifications. If a printed circuit board has a brand but no model, how should it be declared? The model can be filled in as 'no model' or according to the manufacturer's code. If there is indeed no model, it should be declared truthfully and must not be left blank. Are printed circuit boards dangerous goods? Usually they are not dangerous goods, but if they contain specific hazardous substances (such as lead or mercury), they may be subject to environmental regulations. Relevant environmental requirements must be complied with during transportation.