This European Standard classifies thermoplastic resin based wood adhesives for non-structural applications into durability classes D1 to D4 based on the dry and wet strengths of bond-lines measured under specified conditions after various conditioning treatments. For special applications, further tests that do not fall within the scope of this standard may be applicable. The adhesives described in this standard are suitable for the bonding of furniture and interior structures, panelling, doors, windows, stairs etc made of wood or derived timber products. This standard does not define the temperature resistance of bond-lines NOTE Thermoplastic resin are described in EN 923 as: polymer or copolymer, capable of being softened by heating and hardened by cooling.