N

Natural resin
Semi-liquid substance exuded by conifers, used as a basic ingredient in adhesives and cements. e.g. dextrin, casein...
Syn. Glue

Nozzle
The extrusion tip, the point at which the adhesive exits the gun. The nozzle controls the adhesive stream’s volume, shape and direction. Nozzles may have single or multiple orifices.

Natural Rubber, NR (extended definition)
Natural rubber is a polymer produced in the sap of rubber trees (Hevea Brasiliensis) and some other plants. As a natural product, it is formed as a latex which can be collected and dried. The polymer is cis-polyisoprene. It is not cross-linked in the natural state and only becomes a durable solid when it is cross-linked, by for example, vulcanisation.