Adhesives are substances that are capable of holding materials together either by chemical or mechanical attraction. Adhesives may be referred to as glues or pastes, which are available either as ready for use liquids or as dry powders or gum. The working properties of an adhesive are related to its conduct from the time it is made to the moment the ultimate bond is accomplished. Properties that are very important for starch-based adhesives are: viscosity (consistency), storage life, solid contents, PH, tact and penetration.