Due to shortage of softwood and the replacement by hardwood as well as the strongly increased consumption of waste paper as a secondary fibre source deterioration in paper strength are inevitable. Further strength reducing factors are lower single fibre strength that were caused by chemical or mechanical damage. A further factor is a bad fibre to fibre binding. Dry Strength Additives are synthetic organic polymer derivatives. They strengthen and multiply the binding between fibres and fibres as well as fibres and fillers and therefore, improve the structure in paper. The ADVANTAGES are improved strength properties of paper & paper board viz. breaking length, stiffness, burst as well as ply bond strength. An improvement in Retention is a desired side effect. Different grades of products have been developed for acid, neutral and alkaline paper making.