Abstract: A composition for bonding ligno-cellulosic materials to form shaped products, the composition containing a formaldehyde based thermosetting bonding agent and capsules containing an agent reactive with said bonding agent which is at least one of a resin hardening agent, a flame/fire retardant and a water absorbent, wherein the capsules have walls that are capable of degradation to allow access of the agent to the bonding material, such degradation being at a temperature above the temperature prevailing in the system prior to application of heat in a final compression and heating stage.