What are the main components of birch plywood

What are the main components of birch plywood? Regarding this, relevant sources have stated that:
1. Substrate: The main substrate for all birch plywood is all birch wood, which is a high-quality wood with characteristics such as corrosion resistance, compression resistance, and high bending strength.
2. Adhesive: Adhesive is a substance used to bond substrates together. All birch plywood generally uses good and environmentally friendly adhesives to ensure the environmental friendliness and quality of the product.
3. Surface modification layer: The surface modification layer of birch plywood can increase the aesthetic and protective performance of the product, usually using environmentally friendly coatings or resins.
In addition to the main components mentioned above, all birch plywood also has some auxiliary materials, such as preservatives, fire retardants, etc., to enhance the special functions and performance of the product.