One、Is plywood moisture-proof?
Can be moisture-resistant or non-moisture-resistant.
Plywood has a wide range of applications and is used in large quantities. Common types of plywood include Class I, Class II, and Class III plywood, which are classified as weather-resistant, water-resistant, and moisture-resistant, respectively.
Therefore, there are moisture-resistant plywood and plywood that offers limited moisture resistance.
Two. How to prevent moisture in plywood.
Whether a plywood is moisture-resistant primarily depends on the adhesive used.
Class NQF (National Qualification Framework) Weather-Resistant, Boil-Resistant Plywood: Manufactured using phenolic resin adhesives or other high-quality synthetic resin adhesives with equivalent properties, exhibiting durability, resistance to boiling or steam, and antibacterial properties. Primarily used in applications such as aviation, shipbuilding, railway cars, packaging, concrete formwork, waterworks, and other areas requiring high water resistance and weather resistance.
Class II (NS) Moisture-Resistant Plywood: Manufactured using urea-formaldehyde resin or other equivalent adhesives, it can be immersed in cold water, withstand short-term immersion in hot water, and exhibit antibacterial properties, but is not resistant to boiling. Primarily used in transportation vehicles, ships, furniture, interior building decoration, and packaging.
Class III (NC) Moisture-Resistant Plywood: Constructed using urea-formaldehyde resins with low resin content, blood-based adhesives, or other equivalent adhesives, this plywood is resistant to short-term immersion in cold water and is suitable for indoor use under normal conditions. It is primarily used for furniture, packaging, and general construction applications.
Ⅳ Class (BNS) Moisture-Resistant Plywood: When manufactured using soybean glue or other adhesives with comparable performance, this plywood exhibits sufficient bonding strength for indoor use. Primarily used for packaging and general purposes, including the manufacture of tea boxes, which require soybean glue-bonded plywood.