Generally set by solvent evaporation. They are generally of low strength and are susceptible to moisture and mould. Their use is restricted to the joining of low strength materials. Natural adhesives include animal glues, fish glues, vegetable glues and casein.
A vast quantity of natural adhesives are used throughout the world mainly based on starch and casein and mainly in the packaging industry for labels and low cost packaging tape
| Type | Notes | Materials Bonded |
| Animal | Made from collagen, (Skin/bone) with sugar and glycerol added for flexiblily. Supplied as powder/bead which is dissolved in water | Wood, Leather, Porous materials |
| Fish | Improved temperature resistance, resistance to water compared to above | Wood, Leather, Porous materials |
| Vegetable | Based on starch, dextrine. Supplied as a powder for mixing with water. Low strength. Low resistance to water/high temps | Paper /cardboard |
| Casein | Made from milk precipitated with acid. Supplied a powder for mixing with water. Improved properties compared to all above glues | Wood, Paper asbestos products |
