Nailable concrete

Concrete, usually made with a suitable lightweight aggregate, with or without the addition of sawdust, into which nails can be driven.

Natural clay tile

A tile made by either the dust-pressed method or the plastic method, from clays that produce a dense body having a distinctive, slightly textured appearance. (ASTM C 242).

Neat cement

Hydraulic cement in the unhydrated state. Neat cement grout. A fluid mixture of hydraulic cement and water, with or without admixture; also the hardened equivalent of such mixture.

Neat cement paste

A mixture of hydraulic cement and water, both before and after setting and hardening. Neoprene. A type of synthetic rubber with outstanding oil resistance. Can be used for quick-setting, high strength adhesives.

Nepheline syenite

A mineral aggregate consisting chiefly of albite, microcline, and nephelite, each in significant amount. (ASTM C 242).

Nominal sizes

This is the approximate facial size or thickness of tile, expressed in inches or fractions of an inch, for general reference.

Non-slip tile

Tile having greater non-slip characteristics clue to an abrasive admixture, abrasive particles in the surface, grooves or patterns in the surface or because of natural non-skid surface characteristics.

Non-vitreous (non-vitrified)

That degree of vitrification evidenced by relatively high water absorption. (ASTM C 242). NOTE: The term nonvitrcous generally signifies more than 10.0 her cent water absorption, except for floor and wall tile which are considered nonvitreous when water absorption exceeds seven per cent.

Notched trowels

Notched trowels are available in the serrated and square-tooth design. The teeth are made in various sizes. The correct tooth size and depth must be used to apply the thickness of bonding mortar specified. These trowels are used to apply all of the various kinds of bonding materials for ceramic tile. When the teeth become worn, the trowel has to he resharpened or replaced.