Adhesives Based on Natural Raw Materials

In contrast to the young adhesives on synthetic bases, adhesives deriving from natural products have partly been known for millennia. The essential differences compared to reactive adhesives are the partially poor ageing stabilities in humid atmosphere as well as the low bonding strengths. They are not used for highly strained bonded joints of metals, plastics, glasses and similar. However, they record 

In the application field of natural adhesives, the traditional terms paste instead of adhesive or glueing instead of bonding are still in use. 

The development of the adhesive layer follows the principle of physical setting (Section 2.2.2) on simultaneous evaporation or absorption of the water by the (porous) adherends. 

The basic substance of wallpaper paste is cellulose (wood component) that, with regard to the required processing properties (water solubility, strength, removability as the case may be) is chemically modified. 

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