Cold Glue

Cold Glues are water-based solutions. The adhesive solids are dissolved in water, usually by cooking. A bond is formed when almost all of the water is lost via penetration or absorption into substrates. To create a solid bond, it requires 2 absorbent surfaces. There are three main types of cold glue adhesives:
1. Starch-- A whiteoff-white opaque solution, usually low in solids
2. Dextrine-- Depolymerized starches, usually tan to dark brown in color (pyrolysis), which enhance solubility, increase wet tack, lower viscosity andor increase solids, and improve solution viscosity stability.
3. Polyvinyl Alcohol solutions (PVOH)-- A synthetic water soluble adhesive or intermediate, Translucent. The dry film it leaves can be water sensitive or water resistant.
Advantages
Excellent penetration
Excellent wet tack and tack range
Excellent final adhesion to regular stocks
Excellent heat and cold resistance
Easy to clean up with excellent machining characteristics
Storage conditions not critical - freezethaw stable
Low price per wet pound - raw material related
Limitations
Slow setting speed
Poor adhesion to difficult surface
Caution required when diluting
Must be protected from bacterial and fungal attack