Plywood Surface Grading / QualitiesWood, due to its very nature varies in appearance from one piece to the next. A plywood grading system is used to specify aspects of the finished look of the plywood, thus allowing the user to select a material that is suitable for their application. Grading rules vary depending on the country in which the plywood is produced and the following information is a typical guide only and may not be accurate for all plywood. Please refer to the product specific information that can be found on the relevant product descriptions.
AB gradeThis is a very high quality grading (typically the best you will see). The surface of the material will be consistent in appearance with no large variations in colour. Small pin knots are allowed and these would typically be only a few mm in diameter.
Above is a photograph of our AB grade Italian Poplar plywood
B gradeThis grade shows the natural look of the wood. There will be changes in colour that show the grain pattern. Sound, smooth knots are allowed and these will typically be under 15mm to 35mm in diameter (depending on the countries grading rules). The surface should normally be free from open knots and plugs. The material should be suitable for paint / stain or a lacquered finish.
Above is a photograph of our B grade Birch plywood
BR ‘veneer’ gradeThis is similar to B grade material, though knots would typically not exceed 7mm to 8mm in diameter. It shows the natural look of the wood and will show natural colour variations. This grade is used for some of our thinner plywood’s. These thinner materials are used in specialist applications and tend to have a slightly higher quality feel. The surface of the material is sanded to a smoother finish than that of most plywood’s.
Above is a photograph of our BR ‘veneer’ grade Birch plywood
BB gradeThis grade is similar to B grade but allows for larger knots and repairs to the face. Sound, smooth knots are allowed and these will typically be under 50mm in diameter. Open knots can be repaired with wooden plugs. The material should be suitable for applications where the visual look is not critical.
Above is a photograph of our BB grade Birch plywood.
This piece has a plug but knots are also allowed.
C gradeThis grade of plywood is ‘structurally’ sound but allows for defects on the surface of the material. These defects can include open knots, discolouration, and splits. These defects mean the material is suitable for applications where the strength of plywood is needed but the appearance does not matter. Kitronik does not supply any C grade plywood.
CC gradeThis is often used as the underside of veneers, as used on our 3.6mm Oak Veneer Plywood. The structure is sound but there will be defects on the underside of the material. These can include open knots, discolouration, and splits. These defects mean that our veneered plywood is suitable for applications where only one good face is needed.
Above is a photograph of C grade Birch plywoodNote: It is worth remembering that these are ‘worst’ case conditions and the majority of a sheet may actually meet one of the higher classifications.
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