Filler

filler

Entertainment something, such as a musical selection, to fill time in a broadcast or stage presentation

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filler [′fil·ər]

(computer science)

Storage space that does not contain significant data but is needed to comply with length requirements or is reserved to fulfill some future need.

(materials)

An inert material added to paper, resin, bituminous material, and other substances to modify their properties and improve quality.

A material used to fill holes in wood, plaster, or other surfaces before applying a coating such as paint or varnish.

(metallurgy)

The rod used to deposit metal in a joint in brazing, soldering, or welding. Also known as filler metal.

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filler

1. A fine mineral aggregate used as an extender to improve the properties of coating asphalt and plastic asphalt cement.

2. Finely divided inert material (such as pulverized limestone, silica, or colloidal substances) sometimes added to portland cement paint or other materials to reduce shrinkage, improve workability, or act as an extender.

3. A pigmented paste, sometimes colored, rubbed into open-grained wood surfaces to fill the pores prior to finishing.

4. An inert material added to synthetic resin adhesives to improve their properties or reduce cost.

5. A plate which is inserted merely to fill up space; a filler plate.

6. In painting, a composition (often pigmented) used to fill pores or irregularities in a surface in preparation for the application of another coating.

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Filler 

a pasty substance used in painting and varnishing to produce a smooth surface before the surface coat is applied. In addition to film-forming materials, fillers contain extenders such as chalk, talc, and barite as well as pigments such as zinc white and ocher. Fillers may have a varnish, drying-oil, or natural-adhesive base. Since the content of film-forming materials in a filler is 5–12 times lower than that of pigment or extender, fillers do not provide for a sure adhesion of the covering coats to the surface. For this reason, a filler is usually applied over a layer of primer.

A thick filler is applied with a putty knife or a piece of rubber. A filler thinned with small amounts of solvent may be applied with a pneumatic spray gun. The thickness of a layer of filler may reach 300 μ; when a filler is used to fill holes or to seal a joint or a riveted or welded seam, however, several layers with a total thickness of up to 1 mm may be required. The dried-up layer of filler must be sanded well with an abrasive paper. Varnish-based fillers are used mainly in the machine-building industry; fillers with a natural-adhesive or drying-oil base are used primarily in the construction industry.

REFERENCE

Entsiklopediia polimerov, vol. 3. Moscow, 1977.