In the past 10 years, wood plastic composites gained high rise of use for wide range of products for both interior and exterior. There are many different ways of their production, such as: pressing, extrude system, mold injection, etc. Next to different production systems we can also effect the properties of WPC by changing the material used in the mixture. With different additives we can influence the properties of the composite even more. We used different sizes and percentages of wood particles to build a composite. Then we performed different tests and monitored the influence of wood particles on properties of WPC. We found out that we can have influence on mechanical and physical properties with both variables. Using higher percentage and bigger sizes of wood particles we improve mechanical properties such as bending strength, module of elasticity and compressive strength, but we deteriorate the dimension stability, swelling and uptake of water. Using higher percentage and bigger wood particles we get better sorption of water in the interior of composite. That is why the percentage and particle size are very important for specific products regarding the purpose of use of a wood plastic composite
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