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NN

NOZZLE

The tabular tip of a caulking gun through which the compound is extruded.

NON-VOLATILE

Any substance which does not evaporate or volatilize under normal conditions of temperature and pressure.

NON-STAINING

Characteristic of a compound which will not stain a surface by bleeding or migration of its oils or vehicle content.

NON-SKINNING

Descriptive of a product that does not form a surface skin after application. Usually remains tacky or sticky.

NON-RESILIENT TAPE

A high solids content, mastic material furnished in varying thicknesses and widths, in roll form; easily deformed and permanently soft and tacky.

NITRILE RUBBER

A class of rubber-like co-polymers of acrylo nitrile with butadene. There are many types and a few of the trade names are Funa N, Butraprene, and Chemigum. It has high resistance to solvents, oils, greases, heat, and abrasion.

NEOPRENE

A synthetic rubber having physical properties closely resembling those of natural rubber but not requiring sulphur for vulcanization. It is made by polymerizing chloroprenes. The latter is produced from acetylene and hydrogen chloride.

NEEDLE GLAZING

Application of small bead of compound at the sight line by means of gun nozzle about 1/4″ x 1/8″ in opening size.