Pasta 'GOI' and its application

The most popular means for polishing, perhaps, can be called "GOI" paste, because it can be applied on a wide variety of surfaces, from rough metals to glass and soft plastic displays of mobile phones.

The name of the paste is deciphered as follows: State Optical Institute, where they developed this useful product in the 1930s.

Pasta "GOI": appearance and composition

Pasta "GOI" is made in the form of blocks from pale to dark green hue, depending on the content of chromium oxide powder (it can vary from 65 to 85 percent), which forms the basis of the paste. In addition to chromium oxide, organic (fat) binders and auxiliary substances (activating and intensifying additives), such as solvents and chemical reagents such as stearin, kerosene, silica gel (silicon dioxide, white porous mass with absorbing (adsorptive) capacity) are present in it and Other

The GOI paste is produced in the form of paste, and in the form of impregnated felt soft polishing wheels.

For what surfaces is the GOI paste used?

Use this tool for polishing and grinding of steel alloys (including thermally strengthened) of non-ferrous metals, glass (including optical ones), hard polymers and plastics, and ceramic materials. The GOI paste is applied easily and well on polishing wheels.

Pasta "GOI": classification and varieties

Polishing paste "GOI" can be carried out with the help of 3 varieties of paste: coarse, medium and thin.

The rough paste in its composition has about 81 parts of chromium oxide, 5 - fat, 10 - stearin, 2-kerosene and 2 - silica gel. It has a light green hue, it is most effective in terms of the volume of the material being taken, giving a matte surface. This type of paste removes small scratches left on the surfaces after treatment with various abrasive materials (for example, after grinding).

The average paste consists of 76 parts of chromium oxide, 2 - silica gel, 10 - fat, 10 - stearin, 2-kerosene; It has a pure green color and makes it possible to achieve a clean surface and even gloss.

Thin paste is made from 74 parts of chromium oxide, 2 - kerosene, 1,8 - silica gel, 10 - stearin, 0,2 - baking soda (bicarbonate), it has dark green and black-green hues and is used for fine-tuning Grinding), giving a mirror shine.

In addition to this classification, GOI paste is also divided into numbers, depending on the size of the abrasive particles: No. 4 - coarse, to remove scratches and make the matte surface, No. 3 - medium, for a clean surface without strokes; Nos. 1 and 2 - thin, for pure polishing, straightening, mirror gloss and finishing of different tools for wood carving.

The most widely used pasta is No. 2, because it is perfect for polishing jewelry or other surfaces made of non-ferrous metals, glass, hard polymers and plastics.

Pasta "GOI": application

Few know how to correctly apply this tool. Further I result the instruction which will help to cope with polishing by paste "GOI" without problems.

A small amount of the product is applied to the polishing cloth (a soft cloth, ideally suited flannel) or to a polishing wheel. Do not apply the paste directly to the surface that you are going to polish.

Next, the paste, which was applied to a rag, is rubbed against any piece of metal. This is done to remove large pieces of paste that can scratch the surface.

Before applying the product, you can rinse a cloth in kerosene or gasoline for lighters. This will greatly improve the dissolution of this paste.

Then drip a couple of drops of "spindle" (industrial liquid oil) on the polished surface and start polishing the desired surface.

Periodically, you need to drip oil on the product. And when polishing do not make sharp movements with your hands, do not press the surface too hard, because It can not just not remove the existing scratches, but also add new ones. Polish until the desired shine is obtained.

At the end of the work, rinse the product well, preferably in kerosene. If it does not exist, remove the remnants of GOI paste with water.

This is an effective and easy-to-use tool.