Goyi paste color. Goi paste is a practical, versatile and inexpensive tool for grinding and polishing a wide variety of materials.

GOI paste is considered one of the most famous and useful products of the chemical industry from the point of view of industrial and household exploitation. It is worth noting that the described tool was developed back in the 30s of the last century and until today is a popular composition widely used in the applied arts, technical industry, restoration, etc. This paste can be found in virtually any department or store with household goods or electronics. Despite the fact that a particular tool is considered specialized, virtually everyone knows about its existence.

What is GOI paste for?

Describing the peculiarity of the action of GOI paste, it is necessary to start with what it is this product... GOI is an abbreviation for the State Optical Institute, where the form of mass was created. A tool was developed as chemical product, which will allow to restore damaged surfaces, protecting them from external influences and improving the reflective qualities of the plane.

This tool, depending on the type, can be used for processing metal, plastic, glass and other types of surfaces. The described paste is relevant for removing scratches from the surface of knives and for their high-quality grinding. The product acts in the same way on chrome-plated surfaces, after which they acquire their original shine and specularity.

With the help of technical ointment and special tools, you can polish mirror and glass surfaces, including plexiglass. The applied mass on the scratched and damaged glass fills small chips and restores the integrity of the structure. Headlights are polished in a similar way in cars that have lost their former transparency. After carrying out a restorative measure, the quality of the transmission of the light beam is much improved, and it is also necessary to note the aesthetic side of the result of the procedure.

Based on all of the above, it can be argued that GOI paste is needed for recovery procedures. The main thing that the tool allows you to do is to grind, rub, bring to shine, restore specularity, improve transparency, etc.

What the paste consists of: composition

The described tool, like all polishing pastes, consists of a granular, fine-grained powder, combined with a number of components that give the substance the necessary properties and texture. GOI paste is based on chromium oxide powder, which is included in the product in different volumes, depending on its type. The proportions of all other substances that are part of the component composition of the paste also vary, taking into account the type, in the specific case, the number of technical ointment.

There are pastes with varying degrees of hardness, while the percentage of chromium oxide present in them will be 81, 76, 74%. In addition, in the composition of the polishing product, you can also find such substances as:

• kerosene;
• stearin;
• silica gel - silicon dioxide, which allows you to remove excess moisture from the processed material;
• soda.

Due to the specific proportions that have a different appearance when creating a paste of various numbers, the product has a highly effective action, which makes it one of the best means of technical surface treatment of all types.

Varieties of polishing paste

The main parameter that determines the division of the grinding paste into types is the grain size, or rather the size of the scrubbing particles. It should be understood that the described tool is used in various industries where special precision is required in the elaboration of details. Using an improper paste to grind a certain surface, you can scratch the plane with particles that are too abrasive, as well as spoil the reflective and reflective parameters of the material with ultrafine grain.

It must be remembered that GOI paste is produced in four types, to each of which a number is attached that determines their imagery:

• №1 - very fine crumb, which allows the use of this type of paste for polishing smooth surfaces to achieve perfect gloss;
• №2 - it is used for the same purpose as the previous type, however, it has a greater severity of scrubbing particles;
• №3 - great for sharpening steel, as well as polishing metal;
• №4 – best option for removing scratches on metal.

How to soften a paste if it is very hard

As you know, the product in question is quite hard and in situations where it is required to apply the agent to the fabric, in order to polish something, it is necessary to dilute it. For this purpose, you can use ordinary machine oil, after the application of which, a liquid consistency is obtained, represented by diluted GOI.

To carry out the process, it is necessary to chop off a piece of hard paste and apply a few drops of technical oil to it. The resulting mixture must be thoroughly mixed, and then applied to a cloth for further use.

Things to do before polishing the surface

The process of polishing with GOI paste, realized in the form of small green bars, does not require special preparatory measures. All that needs to be done before starting the process is to prepare the necessary tools, and, if possible, in order for the effect to be maximum, it will be necessary to remove dust and dirt from the processing object. It is not necessary to apply the GOI product to the object itself, according to experts - this can only worsen the result.

As for the preparation, it is important to pay attention to the material of the tool with which the grinding will be carried out. The harder and rougher the object, the coarser should be the material of the tool, for example, for metal care it is better to use jeans or felt, and for glass processing, a soft cloth, such as flannel, will be the best option. This is something that needs to be taken care of before starting to polish surfaces.

How to polish with paste: instructions for use

This action will not bring any particular difficulties, since the process is very simple. If the task is to give a perfect surface shine, then you can do it manually, or use a special attachment for a drill or grinder. The nozzle is made of felt, while it can be used without tools, working with a felt wheel by hand.

• To start processing, you need to rub the fabric with paste and start sanding the surface. You can also use the recommendations for liquefying the substance, which were described above. During the sanding process, some specialists add gasoline and engine oil to ensure the best shine to the object being treated.
• In a situation where it is necessary to sharpen the knife, you need to rub a wooden surface or leather with a bar, which is located and fixed on something solid. Now you need to move the knife blade over the area treated with the paste, similar to sharpening the knife in the classic way on a grindstone.

Features of polishing depending on the material

It must be remembered that polishing objects made of various materials using GOI paste or its analogs has a different technology and type. As noted in the previous paragraphs, one should decide on the material with which the grinding will be carried out, and only then proceed to the process of restoration work. It is for this reason that a number of situations are presented below in which the surface treatment technology will have a different look, which will allow you to get the maximum result and prevent damage to the treated surface.

How to use for glass and plastic

It often happens that you may need to sand or polish glass or plastic, for example, on a watch or mobile phone. You can carry out the procedure at home without much difficulty. To do this, you need to take a rag, preferably with a soft nap and GOI No. 2 paste - this is the best option for working with glass and plastic.

Now it is necessary to rub the flap of fabric with a hard bar of technical means so that the layer of paste is felt. When the preparatory procedures are completed, you can start grinding the glass. To do this, it is enough for a few minutes without much addiction, but with little effort to rub the glass surface.

Application for cleaning silverware

Sometimes it happens that over time, silver jewelry loses its luster, becomes dark and unsightly. You can restore the original appearance of silver items using GOI No. 3 paste. To do this, you will need a block of green product, a soft cloth, and a piece of felt or other component that has a harder texture.

First of all, you need to rub the felt with paste, then take the product and lightly work on the felt base on the entire surface of the aged silver. The next step is to use a softer material, similarly giving the object more smoothness, sanding it for several minutes.

Video: sharpening knives with GOI paste with your own hands

This video shows the method of sharpening a knife using GOI paste. The author of the material explains in detail the principle of the procedure, which allows you to further implement the process yourself at home, using the presented video instructions.

Video: Grinding Your Watch to Remove Scratches

This video examines the technology of polishing watches using GOI paste. After reviewing the material, you can get all the necessary information that may be needed when using this tool in order to restore the original shine of the metal watch case, jewelry and other things.

How to replace GOI paste: analogues

Today, there is an indecent amount of various grinding pastes that can replace GOI. All these analogs work on the same principle, being fine or coarsely abrasive, which allows you to choose required composition for processing a specific surface. At the same time, modern means can be found in different types e.g. sprays, gels, bars, ointments, etc.

Among the most popular products today, the following lines of technical means for polishing various surfaces can be noted:

• Rupes;
• Depural Neo, etc.

(including thermally hardened ones), non-ferrous metals, hard plastics and polymers, glasses (including optical glass), ceramic materials and products made from them.

Appearance

GOI paste is light green or dark green bars, consisting of abrasive chromium oxide powder, organic (fatty) binders and auxiliary substances (activating and intensifying additives). GOI pastes are produced both in the form of bars and in the form of soft (felt) polishing wheels already impregnated with the paste. They are a mixture of chromium oxide (gives a green color, the shade of which depends on the percentage - 65-80%), as well as solvents and chemical reagents - kerosene, stearin, silica gel and others. There are 3 main varieties of GOI paste: coarse, medium (in the images) and fine (No. 1 and No. 2). Rough has a light green color, the most effective in terms of the volume of material removed, gives a matte surface. The middle one is green and gives a clean surface. Thin pastes have, respectively, dark green and black with a greenish sheen, are used for fine lapping (finishing), give a mirror shine.

Developers

GOI pastes were developed in 1931-1933. a group of Soviet scientists, employees of the State Optical Institute - I. V. Grebenshchikov, T. N. Krylova, V. P. Lavrov, S. V. Nesmelov.

Varieties of GOI pastes and their application

Note

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An excerpt characterizing Pasta GOI

But Dolokhov did not leave; he untied the handkerchief, tugged at it, and showed the blood caked in his hair.
- Wound with a bayonet, I stayed at the front. Remember, your excellency.

The Tushin battery was forgotten, and only at the very end of the case, continuing to hear the cannonade in the center, Prince Bagration sent an officer on duty there and then Prince Andrey to tell the battery to retreat as soon as possible. The cover that stood beside Tushin's cannons left, at someone's order, in the middle of the case; but the battery continued to fire and was not taken by the French only because the enemy could not imagine the audacity of firing four unprotected cannons. On the contrary, according to the energetic action of this battery, he assumed that the main forces of the Russians were concentrated here, in the center, and twice tried to attack this point, and both times he was chased by grape-shot shots of four guns standing alone on this hill.
Soon after the departure of Prince Bagration, Tushin managed to light Shengraben.
- See, they are confused! It is burning! See, that smoke! Cleverly! Important! Smoke that, smoke that! - the servant began to speak, becoming more animated.
All the guns, without orders, fired in the direction of the fire. As if urging on, the soldiers shouted to each shot: “Dexterously! That's how it is! Look, you ... Important! " The fire, carried by the wind, spread rapidly. The French columns, which advanced for the village, retreated, but, as if in punishment for this failure, the enemy put ten guns to the right of the village and began to beat Tushino with them.
Because of the childish joy excited by the fire, and the excitement of successfully shooting at the French, our gunners noticed this battery only when two cannonballs and four more after them hit between the guns and one knocked down two horses, and the other tore off the leg of the box leader. The revival, once established, however, did not diminish, but only changed the mood. The horses were replaced by others from the spare gun carriage, the wounded were removed, and four guns were turned against the ten-gun battery. The officer, Comrade Tushina, was killed at the beginning of the case, and in the course of an hour seventeen of the forty servants dropped out, but the artillerymen were still cheerful and lively. Twice they noticed that below, close to them, the French appeared, and then they beat them with buckshot.
The little man, with weak, awkward movements, constantly demanded another pipe from the orderly for this, as he said, and, scattering fire from it, ran forward and looked at the French from under the little hand.
- Crash, guys! - he said, and he himself picked up the guns by the wheels and unscrewed the screws.
In the smoke, deafened by the incessant shots that made him shudder every time, Tushin, without letting go of his naso-warmer, ran from one gun to another, now taking aim, now counting the charges, now commanding the change and harnessing of dead and wounded horses, and shouted to his weak thin, an indecisive voice. His face became more and more animated. Only when people were killed or wounded, he winced and, turning away from the killed, angrily shouted at the people, as always, hesitating to lift the wounded or the body. The soldiers, mostly handsome fellows (as always in a battery company, two heads taller than their officer and twice as wide as him), all, like children in a difficult situation, looked at their commander, and the expression that was on his face was invariable reflected on their faces.
As a result of this terrible hum, noise, need for attention and activity, Tushin did not experience the slightest unpleasant feeling of fear, and the idea that he could be killed or hurt painfully did not occur to him. On the contrary, he became more and more cheerful. It seemed to him that a very long time ago, almost yesterday, there was that moment when he saw the enemy and fired the first shot, and that the patch of field on which he stood was a familiar, kindred place to him for a long time. Despite the fact that he remembered everything, understood everything, did everything that the best officer in his position could do, he was in a state similar to a feverish delirium or the state of a drunk man.
Because of the deafening sounds from all sides of their guns, because of the whistle and blows of enemy shells, because of the sight of the sweaty, flushed, hurrying servants around the guns, because of the blood of people and horses, because of the haze of the enemy on the other side (after which everyone Once a cannonball flew in and hit the ground, into a person, into a tool or into a horse), because of the sight of these objects, his own fantastic world was established in his head, which was his pleasure at that moment. The enemy cannons in his imagination were not cannons, but pipes, from which an invisible smoker released smoke in rare puffs.
- See, puffed again, - said Tushin in a whisper to himself, while a puff of smoke was leaping out of the mountain and blowing to the left in a streak, - now wait - send the ball back.
- What do you order, your honor? - asked the fireworks, who stood close to him and heard that he was muttering something.

Pasta history
This polishing agent was developed in our country and a very long time ago - in the 30s of the twentieth century. It was invented by specialists from the State Optical Institute. Hence the name of the paste (in the first letters) - GOI.

For nearly a century, this product has been used to polish steel, other metals, ceramics, plastics, stone and even glass. Our grandfathers knew how to use GOI paste. It was originally made from chromium oxide and auxiliary substances and had a green color. Today, such a remedy can also be found in stores and on the market.
However, the production of green pasta is currently prohibited and discontinued. The fact is that chromium oxide is a poisonous carcinogen. Modern GOI pastes are white or red and are made from aluminum oxide. With the second type, polishing is faster. With the use of a white paste, you can get a better and smoother surface.

Varieties of green pasta
We will talk about how to use GOI paste correctly below. Now let's see what varieties of this material exist. Once there were three types of GOI green paste. And today, even in a store or on the Internet, you can buy a product with different sizes of abrasive particles: No. 4 - intended for initial rough polishing of surfaces; No. 3 - gives the surface a matte look, while strokes are not visible on it; # 2 and # 1 are used for finishing and give a glossy finish. A green variety was produced both in solid bars and in the form of a more liquid pasty mass (in boxes). The popularity of both types is due not only to the high quality of polishing, but also to the more than affordable price.

What you need to do before polishing So, let's start to understand how to use GOI paste. Small particles in it, when rubbing the surface, remove a thin layer along with scratches and microcracks. Polishing is usually done with a soft cloth dipped in gasoline (you can use a lighter). A small layer of paste is applied to it and rubbed a little against an unnecessary piece of metal. This is necessary so that all too large pieces are broken in the paste. If they remain, the surface may not be polished, but rather scratched. The cloth should be really soft. Take flannel, for example. Sometimes the paste is applied to the polishing wheel as well. It cannot be smeared directly on the surface of the workpiece. The product is preliminarily slightly coated with liquid industrial oil ("spindle").

How to use GOI paste on glass and plastic.
Very often this tool is used to make cell phones "divine". In this case, it will be necessary to polish, firstly, the case itself, and secondly, the display glass. Since plastic is a rather soft material, you should use a gentle paste from jars No. 2 to process it. Otherwise, the case may be scratched even more. The answer to the question of how to use GOI paste for plastic is simple: just like when processing any other materials. The glass is pre-polished with special rubber wheels. Further, the actual GOI paste is used. The procedure in this case is carried out in the same way, that is, using a rag. Oil and gasoline are not used when processing phones.

How to use GOI paste for cleaning silver items
As already mentioned, this tool, both green and red or white, can be used to process absolutely any metals. This also applies to silver. Feel free to use GOI paste to lighten your spoons, cups and forks. How to use GOI paste for cleaning silver? Before starting polishing, the product should first be thoroughly brushed with a toothbrush coated with tooth powder. Then pour a little ammonia into a glass of water, adjust the soap and add a little powder. All this must be thoroughly mixed until completely dissolved. Next, the liquid is poured into an enamel saucepan. After that, silver cutlery is lowered into it. Then put the saucepan on the fire and bring the liquid to a boil. After that, the silver should be removed and rinsed in cold water... Then you can start processing it with GOI paste according to the method described above.

What cannot be polished
Next, let's see in what cases GOI paste cannot be applied. You now know how to use it. However, in no case should this tool be used for processing gilded items. Otherwise, the top valuable layer will be very quickly erased to the bottom metal. Steel (except for knives) and nickel are usually processed not by hand, but using a special machine. Metal watches are also polished with a cloth. However, they must first be disassembled and the mechanism removed. Do not start polishing too badly scratched surfaces with option No. 2 or 1. In this case, the defects will become even more noticeable. You cannot polish sapphire glasses on watches with GOI paste. She simply does not take them. Where is the tool used? We figured out how to polish with GOI paste. Now let's see where exactly this tool is used. GOI paste is used not only at home for polishing, silver, watches, dangerous blades and razors, etc., but also in production. In the latter case, it is used most often in electroplating workshops for the processing of products from non-ferrous and ferrous metals. Polishing is carried out using special polishing machines with felt wheels.

Paste GOI

Piece of GOI pasta

Varieties of GOI pastes and their application

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GOI paste is an abrasive material used for grinding and polishing the surfaces of steel, plastic, non-ferrous metals, glasses, ceramics, etc. It got its name from the abbreviation of the scientific institution where it was developed - the State Optical Institute. Created on the basis of chromium oxide with the addition of a number of other materials to improve properties.

Chemical composition

The material is made in the form of green rectangular bars with a dark or light shade. The main components are chromium oxide, various binders and other additional components. Depending on the type of paste, the main abrasive is 65 to 80 percent of the total volume. In addition to bars, the paste is produced in plastic containers and as an impregnation for felt circles already in finished form... The soft circle is supplied for sale already impregnated with the required amount of GOI paste and is ready for use.

You can also determine the composition of the paste by its color. The more chromium oxide it contains, the lighter it is and the more abrasive it is. The darkest, almost black paste with a green sheen is used for fine polishing and giving a mirror shine to the surfaces, the lightened one - for coarse sanding.

Classification and application

There are three main grades of material - coarse, medium and fine. The latter, in turn, is subdivided into number 1 and number 2. Depending on the abrasive qualities, the paste is divided into the following types:

• Paste N 1. Has a black color with a greenish sheen and an abrasiveness of 0.3 - 0.1 microns. Chromium oxide content from 65 to 70%. It is used for finishing, mirror polishing.
• Paste N 2. Material of dark green color with abrasive ability of 7 -1 microns. Chromium oxide content from 65 to 77%. It is used for fine finishing to give the surface a mirror-like shine.
• Paste No. 3. Has a green color and gives abrasion in one pass 17 - 8 microns. Medium grade, contains 70 to 80% abrasive material. It is used to create a clean surface and obtain an even shine.
• Paste N 4. Light green material with abrasive abrasion of 40 - 18 microns. Abrasive content from 75 to 85%. Used to obtain a matte finish and remove minor scratches.

Application features

Let's consider the simplest way to use this material correctly. Please note that handling errors, the use of large particles and excessive force can damage the surface.

Basic order of work:

• A small amount of the paste is applied to a polishing wheel or flannel rag or other soft cloth. Do not apply the material directly to the surface to be treated. You can pre-wet a rag with kerosene or gasoline for better dissolution.
• Rub the paste on a rag or circle on the metal. This is required to remove large pieces abrasive material that can damage the surface.
• Add a small amount of industrial oil to the surface to be treated.
• After that, you can start polishing, periodically adding lubricant.
• In the process of work, one should not make sudden movements or apply great efforts. This can lead to scratches.
• Polish to the desired shine. After completion, rinse the surface with kerosene or remove the remaining abrasive with water.

The GOI paste was widely used due to its ease of use, the ability to perform fine grinding of surfaces at home.