Board Thickness

Board Thickness is a key technical specification in the packaging, printing, and paper products industries. It refers to the vertical measurement of single or multi-layer board under specific pressure, typically expressed in millimeters (mm) or points (pt, 1pt=0.0254mm). In foreign trade, this term is commonly used in specifications for cartons, boxes, display stands, etc., directly affecting packaging strength, cushioning performance, and cost. Usage scenarios include: quality clauses in procurement contracts, product specification sheets, document requirements in letters of credit (e.g., specifying thickness tolerance), and inspection standards. Notes: Different countries or industry standards (e.g., FEFCO, ASTM) have variations in measurement methods and tolerance ranges; contracts should specify the measuring instrument, pressure conditions, and allowable deviation (e.g., ±0.2mm); thickness is different from GSM (grams per square meter), the former being a physical dimension and the latter a mass per unit area, and they must not be confused; additionally, board thickness is affected by humidity, and transport/storage conditions may cause changes. Compared with terms like 'board GSM' and 'bursting strength,' thickness focuses more on physical dimensions rather than mechanical properties, and is often used in conjunction with 'number of layers' (e.g., 3-layer, 5-layer corrugated board). Foreign trade practitioners should ensure both buyer and seller have a consistent definition of thickness to avoid disputes caused by different measurement methods.