I. Common Specifications and Sizes of Plywood
Plywood is a composite material made by gluing together three or more layers of wood, which are either sliced from wood planks or cut from wood blocks. Typically, plywood consists of an odd number of layers, with the fibers of adjacent layers oriented perpendicularly to each other. Common dimensions for plywood are 1220mm x 2440mm, and the standard thicknesses are typically 3mm, 5mm, 9mm, 12mm, 15mm, and 18mm.
The market for plywood is generally divided into three main categories: imported panels, joint venture panels, and domestic panels. Common sizes include 1220×2440×3mm and 1220×2440×5mm; other sizes include 1220×1830×3mm or 5mm, and 915×1830×3mm or 5mm. There are also specialized door panels with sizes of 915×2135×3mm and 1220×2135×3mm. Plywood with any other dimensions is considered a narrow-width plywood, which is not commonly used in interior decoration. Multi-layer plywood refers to those with 7 or more layers, primarily used for construction and vehicle applications. When selecting plywood, it is important to determine the specifications and dimensions. Consumers can use this information to calculate the required amount of material based on their interior decoration area needs. It is not recommended to use a 5-layer panel in a 3-layer panel area to avoid unnecessary waste.
What are the applications of plywood?
1、Class I (NQF) weather-resistant, boil-water-resistant plywood
- Durable, resistant to boiling or steam treatment, and with antibacterial properties.- Made from phenolic resins or other high-quality synthetic resins with similar properties.- Primarily used in aviation, shipbuilding, transportation vehicles, packaging, concrete formwork, waterworks, and other applications where water resistance and weather resistance are required.
2、Class II (NS) Waterproof Plywood
Can be immersed in cold water, withstand short-term hot water immersion, and possess antibacterial properties, but is not suitable for boiling. Typically manufactured from urea-formaldehyde resin or other similar adhesives. Primarily used in transportation vehicles, ships, furniture, interior building decoration, and packaging.
3、Class III (NC) moisture-resistant plywood
Can withstand short-term immersion in cold water, suitable for normal indoor use. Made from urea-formaldehyde resin, blood-based adhesive, or other adhesives with similar properties and low resin content. Used for furniture, packaging, and general construction applications.
4、Class IV (BNS) adhesives are not suitable for use with moisture-sensitive plywood.
- Suitable for normal indoor use, with sufficient bonding strength.- Bonded using bean-based glue or other adhesives with comparable properties.- Primarily used for packaging and general applications; tea boxes require bonding with bean-based glue.