The TAPPI T 836 standard defines a method for determining the flexural stiffness of paper and cardboard using a four-point method. The standard evaluates the flexural stiffness of paper or cardboard under force by applying four support points to the paper and measuring its flexural Response. This test method is essential for evaluating the Mechanical Properties of paper and is widely used in the paper manufacturing, Cardboard production and Encasement industries to help determine the strength, durability and suitability of paper products.