Classification
(1) According to the use, it is divided into ordinary plywood and special plywood.
(2) Ordinary plywood is divided into class I plywood, class II plywood, and class III plywood, which are weather-resistant, water-resistant and moisture-resistant plywood.
(3) Ordinary plywood is divided into unsanded board and sanded board according to whether the surface is sanded or not.
(4) According to the tree species, it is divided into conifer plywood and pavilion plywood.
| Classification | Product performance | Application | ||
| Weather resistant and boiling water resistant plywood | WPB | It is durable, resistant to boiling or steam treatment and antibacterial. Made of phenolic resin glue or other high-quality synthetic resin glue with equivalent properties | outdoor | Used in aviation, ships, carriages, packaging, concrete formwork, water conservancy projects and other places requiring good water resistance and weather resistance |
| Waterproof plywood | WR | Can be immersed in cold water, can withstand short-term hot water immersion, and has antibacterial properties, but is not resistant to boiling, made of urea-formaldehyde resin or other adhesives with equivalent properties | indoor | For carriages, ships, furniture, building interior decoration and packaging |
| Moisture resistant plywood | MR | It can withstand short-term cold water immersion and is suitable for indoor use under normal conditions. Made by gluing with low resin content urea-formaldehyde resin, blood glue or other adhesives of equivalent performance | indoor | For furniture, packaging and general construction purposes |
Plywood Classification Terms and Definitions
| Name | Definition |
| composite plywood | The core layer (or some specific layers) is composed of veneer or other materials than solid wood, and each side of the core layer has at least two layers of interlaced veneer blanks glued together. |
| symmetrical structure plywood | The veneers of the corresponding layers on both sides of the central layer correspond to the same plywood in terms of tree species, thickness, grain direction and physical and mechanical properties. |
| plywood for general use | General purpose plywood. |
| marine plywood | It is a kind of high water-resistance special plywood formed by hot pressing and gluing the surface board impregnated with phenolic resin glue and the core board coated with phenolic resin glue. (Note: Mainly used in the manufacture of ship parts) |
| flame retardant plywood | Plywood and its surface decoration products whose combustion performance meets the requirements of Grade Β1 in GB 8624. |
| insect resistant plywood | Insect repellant is added to the veneer or adhesive, or the product is treated with insect repellant, and it has the function of preventing insects from invading special plywood. |
| preservative-treated plywood | Preservatives are added to the veneer or adhesive, or the product is treated with preservatives, special plywood with the function of preventing fungal discoloration and decay. |
| Ply bamboo | Plywood is made of bamboo as raw material and according to the principle of plywood composition. (Note: including bamboo plywood, bamboo strip plywood, bamboo plywood, bamboo curtain plywood, composite bamboo plywood, etc.) |
| composite plywood | Plywood is a kind of plywood made of various sheet-like materials processed from bamboo and wood, and then pressed into blanks after sizing. |
| class Ⅰ plywood | Weather-resistant plywood for use in outdoor conditions, capable of passing the boil test. |
| class Ⅱ plywood | Water-resistant plywood that can pass the 63°C±3°C hot water immersion test for use in humid conditions. |
| class Ⅲ plywood | Moisture-resistant plywood that can pass the dry test and is intended for use in dry conditions. |
| interior type plywood | Plywood made of urea-formaldehyde resin glue or an adhesive with the same performance cannot withstand water immersion or high humidity for a long time, and is limited to indoor use. |
| exterior type plywood | Plywood made of phenolic resin glue or resin with the same performance as the adhesive has the properties of weather resistance, water resistance and high humidity resistance, and is suitable for outdoor use. |
| structural plywood | Plywood can be used as a load-bearing structural member of a building. |
| plywood for concrete | Plywood that can be used as concrete forming moulds. |
| long-grain plywood | Plywood with the wood grain direction of the surface parallel or approximately parallel to the length of the board. |
| cross-grain plywood | Plywood with wood grain direction parallel or approximately parallel to the width of the board. |
| multi-plywood | Plywood made from five or more layers of veneer blanks. |
| moulded plywood | It is a non-planar plywood made of glue-coated veneers to form slabs according to certain requirements and hot-pressed in a mold of a specific shape. |
| finger joint plywood | The end of the plywood in the direction of the grain is processed into a finger-shaped tenon, and the long plywood is connected by gluing and finger-joining. |
