USES OF VARNISH

What is Varnish? USES OF VARNISH

Varnish is a clear transparent hard protective finish liquid. It is used to provide a protective surface coating in much the same way as paints do. Varnish has little or no color and no added pigment as opposed to paint or wood stain which contains pigment.

Components of Varnish:

Varnish is a combination of a drying oil, a resin, and a thinner or solvent. However, different types of varnish have different components.

After being applied the film-forming substances in varnishes either be harden directly, as soon as the solvent has fully evaporated, or harden.

After evaporation of the solvent by curing processes, primarily chemical reaction between oils and oxygen from the air (autoxidation) and chemical reactions between components of the varnish.

Feature and Benefits:

       Durable Insulation & Stable Hardness. Excellent Electrical Properties. High Bonding and hence firmly holds the wires. Exhibits good flexibility. Durable Insulation. Dries fast ensuring rapid service to customers. Generally, they have good UV-resistance

How to apply?

There are four main methods ofapplying varnishes for insulating purposes

spraying for surface insulation brushing for surface insulation dipping (hot or cold) vacuum impregnation.

Uses of Varnish:

Varnishes are either more or less transparent liquids which are used to provide a protective surface coating in much the same way as paints do. At the same time varnish allow the original surface to show but add a lustrous and glossy finish to it.

It is mainly used in wood finishing applications where the natural tones and grains in the wood are intended to be visible.

Varnish is applied over wood stains as a final step to achieve a film for gloss and protection. Varnish finishes are mostly glossy but might be designed to produce satin or semi-gloss sheens by the addition of flatting agents.

Environmental factors:

Environmental factors such as heat and humidity they play a very large role in the drying and curing times of varnishes.

In classic varnish the cure rate depends on the type of oil used &, to some extent, on the ratio of oil to resin. The drying and curing time of all varnishes may be sped up by exposure to an energy source such as sunlight, UV light, or heat.

Types ofVarnish

Varnishes is divided into the following solvent used:

1.

Oil varnishes

four categories, depending upon the type of

Oil varnishes dry slowly, but form hard and durable surface. These varnishes use linseed oil as solvent in which hard resins such as amber and copal are dissolved by heating. Oil varnishes are recommended for all outer wood work, & for joinery and fittings.

2.

Spirit varnishes or lacquers

Spirit varnishes or lacquers varnishes are methylated spirit of wine as solvent in which soft resins such as lac or shellac are dissolved. They dry quickly, but are not durable. French polish is a variety of this type Varnish. It is commonly used on furniture.

3.

Turpentine varnishes

Turpentine varnishes use turpentine as solvent in which soft resins such as gum dimmer, mastic and rosin are dissolved. The varnish dries quickly, but is not so durable. These are cheaper than oil varnishes.

4.

Water varnishes

Water varnishes are formed by dissolving shellac in hot water, using enough quantity of ammonia, borax, potash or soda. Water varnishes are used for varnishing wall papers, maps pictures, etc.

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