When people are building or renovating they often purchase plywood without checking the quality of the product. If the plywood is not good quality, it can warp, swell or come apart after a few months which will result in expensive repairs. It’s important to know what things you should check before purchasing as this could save you a lot of time, money and hassle. If you are making furniture, flooring or interior items, the standard of plywood you select will straightaway affect how long-lasting and well-finished your work is.
Check the Grade and Certification
Each plywood sheet has a grade mark that gives information about its structural strength and surface quality. You should check for ISI certification (IS:303 or IS:710) on the sheet or in its package, as these are standards defined by the Bureau of Indian Standards. The certified plywood undergoes testing for bonding strength, resistance to moisture and core quality. Always review and be wary of unmarked and partially marked sheets. They usually do not meet the set quality standards.
Inspect the Surface and Core
Move your hand over both sides of the plywood sheet. A high-quality sheet will give a smooth and even feeling, without any seen patches, overlaps or coarse surfaces. When observing the edges of this sheet, you should notice that core layers are closely compacted together with no visible spaces, gaps or foreign materials inside them. Empty spaces within the core greatly reduce the strength and stability. Many producers fill these gaps with sawdust or poor-quality materials, leading to sheets cracking or being unevenly compressed when weight is applied.
Test the Thickness Uniformity
Using a measuring scale or a vernier caliper, check the thickness at many spots around the sheet, particularly corners and edges. A reliable sheet will have an even thickness throughout. Any deviation of a millimetre or two on the surface indicates non-uniform pressing during the manufacture. This irregularity will cause the sheet to bend, warp, or bulge when it’s mounted and when humidity or temperature changes. For example, Duroply takes great care to observe the pressing rules ensuring the thickness remains even from edge to edge.
Assess the Bonding Strength
The strength of bonding decides how good the plywood stays intact when under pressure and in damp conditions. A basic field test is to use your nail or a sharp thing to scratch at its corner. If layers of veneer come off easily, it means that the adhesive used for bondings is not high quality. Good plywood uses phenol formaldehyde or melamine urea formaldehyde glue which withstands heat and dampness. Weak bond is a major reason for layer separation in plywood used in kitchen, bathroom and outside spaces.
Evaluate Weight and Density
Lift the plywood sheet and evaluate its weight compared to its size. High-quality plywood should feel heavy and firm. Sheets that seem oddly light for their measurements usually have empty spaces or low-density materials inside them. These fillers decrease the board’s strength but keep the cost unnaturally low. Well constructed, thick plywood is strong and keeps screws in place—ideal for furniture or structures.
Pay Attention to the Smell
A fresh quality plywood generally smells good and wood. In case of a severe chemical or bad odor, it may be due to excessive (above the safe limit) and poor quality glue or formaldehyde. It is not only a question of quality – it is a question of health safety, particularly for furniture within the home and in places where children will remain. Please ensure that the plywood you select is okay to use indoors according to emission standards.
