Ingredients for glass production. Glass - what is it and how is it produced? Properties of glass. Method of making glass using a roaster

What is known about glassmaking?

It is known from history that glassmaking is a very ancient process. How it's done? The time frame dates back to approximately the period before 2500 BC. Previously, such a rare and valuable occupation has now been replaced by the widespread production of this material.

Glass products are found everywhere. They are used as containers, household and decorative elements, insulators, reinforcing fiber and other things. Glasses differ only in the constituent material used for manufacturing. But the process itself is almost the same.

Basic materials you will need:

1. the main element is quartz sand (silicon dioxide);
2. sodium carbonate or soda;
3. calcium oxide, also known as lime;
4. furnace for melting glass;
5. other salts and oxides that can be used additionally on an individual basis (oxides of aluminum, iron, magnesium, lead and calcium or sodium salts);
6. protective clothing;
7. grill;
8. charcoal;
9. molds and other elements for giving shape;
10. fireproof crucible.

Methods for making glass using a furnace

The first way to solder glass at home is to use a stove.

Purchasing quartz sand:

• This material is the basis for glass production. Glass, which does not contain iron impurities, has its advantages - it is light. The same cannot be said about the glass in which it is present. It will smell green.
• It is important to put on a mask before starting work. Quartz sand is fine-grained and easily enters the nasal cavity and further into the lungs. This, in turn, will irritate your throat.
• You can easily purchase quartz sand in a specialized online store. Its cost is low.

Important! The cost of the approximate quantity that will be needed will be around 20 USD. e. In the future, you can purchase up to a ton of it, the approximate cost of which will be 100 USD. e. This is if you plan to work on an industrial scale.

• It happens that finding high-quality sand is not so easy, and it contains more impurities. Dont be upset. In this case, manganese dioxide will come to the rescue. It should be added in small quantities. If your idea is glass with a greenish tint, then you don’t need to do anything at all. Leave everything as it is.

Addition of calcium carbonate and oxide:

• In this case, carbonate reduces the temperature of production of industrial glasses. At the same time, it causes corrosion of glass with the participation of water. To avoid this, it is necessary to additionally introduce lime or calcium oxide into the glass.
• For glass resistance, magnesium or aluminum oxides are used. As a rule, these inclusions do not occupy a large percentage of the glass composition. The figure is approximately 26-30 percent.

Adding other chemical elements:

• This method of making decorative glass at home requires the use of lead oxide. It gives shine to crystal, its low hardness, makes it easy to cut, and gives it a low temperature of melt formation.
• Lanthanum oxide can be found in eyeglass lenses. It has refractive properties.
• As for lead crystal, it can contain up to 33 percent lead oxide.

Important! The more lead, the more dexterity is required to shape the molten glass. Based on this, many glassblowers prefer a smaller amount.

• Iron impurities in quartz glass give it a green tint. In this case, iron oxide is added to increase the greenish tint. This also applies to copper oxide.
• Yellow, amber, and even black colors can be obtained using a sulfur compound. It all depends on the amount of carbon or iron added to the glass charge.

Main stages of glass production:

• Place the mixture in a heat-resistant crucible. The latter should be as resistant as possible to the temperature that will be in the oven. It can vary from 1500 to 2500 degrees. It depends on the additives.

Important! There is also one important requirement for the crucible - it must be such that it can be easily fixed with metal tongs.

• Melt the mixture to a liquid consistency. For industrial silicate glass, this can be done in a gas-heated furnace.

Important! There are also electric, muffle and pot furnaces. They can be made of special glass. Please note that quartz and sand, which do not contain additional impurities, turn into a glassy state when the oven temperature is 2500 degrees Celsius. If you add sodium carbonate to the contents, this is ordinary soda, the temperature will drop to 1500 degrees.

• Carefully monitor the consistency of the glass. It is important to remove all bubbles from it in a timely manner. This can be achieved by stirring regularly until the consistency is uniform. It is also necessary to add one of the elements - sodium chloride, sodium sulfate or antimony oxide.
• Shape the glass. To do this, use one of the following methods.
• The simplest thing is to pour the glass melt into a mold and wait until it cools. Using this method, many optical lenses are created. Previously, this was the method used by the Egyptians.
• Place the finished molten glass in a bath containing molten tin. The latter acts as a substrate. Next, you need to blow it with compressed nitrogen to shape or polish it. Another way is to collect the required amount of glass at the end of a hollow pipe and, turning the pipe, blow it out.

Important! Glass made using this method is called float glass. This is what they have been producing since the early 1950s.

• Leave the glass to cool. It is important to place it in a place where it will not be damaged, it will not be spoiled by water, dust or, for example, leaves. Keep in mind that if it comes into contact with cold objects, it will crack.
• The final step of this method of making glass at home will be annealing the glass. This method of heat treatment will add strength to the material. When using it, all point sources of stress that may be encountered during the glass cooling process will be removed.

Important! Upon completion of this work, additional coatings can be applied to the glass to increase durability and strength. Can also be laminated.

1. Unannealed glass has less strength.
2. As for the temperature for finishing work, it depends on the exact composition of the glass - from 400 to 550 degrees Celsius.
3. The cooling rate of glass depends on the size. Large glass items must be cooled slowly. Things go faster with smaller ones.

Method of making glass using a roaster

The second way to make glass at home is with a charcoal roaster. Let’s look at everything step by step in this case too.

Equipment for work

First you need to make a stove. A barbecue grill is perfect for this. It is important that it is heated with charcoal. In this case, the heat generated by coal when burned is used to melt quartz sand into glass. Again, the cost of this material is not too high. They are widely available.

Important! Use a standard size grill. It would be better if it was in the form of a dome. The main qualities that it must have are the presence of thick walls and good strength. If your grill has a vent, usually on the bottom, it needs to be opened.

However, there may be some minor hurdles in this method. Even if there are very high temperature numbers, it is not always possible to melt it easily. To do this, before starting the process, you need to add lime, borax or washing soda to the sand. The amount of additives should not exceed ⅓-¼ of the volume of sand.

Important! Remember that these additives significantly reduce the melting point of sand.

Formatting glass

To blow glass, prepare a long, hollow metal tube. In order to pour glass, you need a mold. It should be dense and should not melt from the hot glass. Use graphite, for example.

Important! When using this method, remember that the grill heats up much higher than normal. It is possible that the grill itself may melt. Therefore, when making glass using this method, you need to perform all actions carefully and responsibly. Negligence can result in serious injury or even death.

Security measures:

1. Place a large amount of sand and a fire extinguisher near the work area.
2. All work must be done outdoors.
3. The floor should be concrete, for example.
4. When cooking glass, stay away from the grill in order to protect yourself and your clothing from high temperatures.
5. Don't forget to wear protective clothing. This includes fire-resistant clothing, oven mitts, a high-strength apron over clothing, and always a welding mask.
6. Also in this method you will need a vacuum cleaner. It will act as a coal blower. We position it as follows: we place the body at a sufficient distance. We fix the hose to the ventilation hole, which is located below. It may need to be bent to get the desired shape. You can fix it to one of the grill legs. The hose must be secured firmly and not move.

Important! If the opposite happens, then under no circumstances approach it, because it is very hot. Next, you need to turn off the vacuum cleaner and look at the position of the hose. It should be aimed exactly at the ventilation hole.

Operating procedure:

• Place charcoal on the inside of the grill. It is necessary to put in two or even three times more than for roasting meat. It's good if it's filled almost to the brim.

Important! Use hardwood charcoal. It burns faster and better than briquetted.

• Place a cast iron container or crucible with sand in the middle of the bowl.
• Carefully examine the packaging of the charcoal you use. Light it in a suitable manner. There is coal that lights itself directly, and there is material for which lighter fluid is used. Wait until the flame spreads evenly.
• Wait until the coal is ready for further work. The readiness of coals can be determined by color. They will be orange.
• The next step is to turn on the vacuum cleaner. This is necessary to ensure that the coal is blown through.

Important! Coal exposed to air flow can reach very high temperatures. Up to approximately 1100 degrees Celsius. This must be taken into account when near the stove. Rising flashes may appear from it.

What is glass made from?

1. It's better to buy it in a store and not worry about it.
2. What is glass made from?

   Paradoxically, GLASS is a liquid in a frozen state.
   The main component of glass, which is included in it in the largest quantity (60-70% of the volume) and determines its typical properties, is SILICA SiO2 (sand, quartz, fine-grained sandstone).
   Silica is introduced into the composition of glass, in the form of, for example, quartz sand.
   In glassmaking, only the CLEANEST varieties of quartz sand are used, in which the total amount of impurities (clay, lime, mica impurities) does not exceed 2-3%.
   Particularly undesirable is the presence of iron, which, when found in sand even in small quantities, colors glass in an unpleasant greenish color.

   Glass can be welded from sand alone without adding any other substances to it, but this requires a very high temperature (over 1700 degrees C).
   Conventional modern furnaces made of refractory clay bricks, which use solid, liquid or gaseous fuel, are not suitable for this: you have to resort to electric furnaces, the operation of which is very expensive.
   Therefore, to reduce the melting point of sand, various additives are used...

3. It is made from sand at high temperature and a certain pressure.
4. To make glass, craftsmen take: quartz sand (the main component); lime; soda; How glass is made First, quartz sand, soda and lime are heated in a special furnace to a temperature of 1700 degrees above zero. The grains of sand connect with each other, then homogenize (turn into a homogeneous substance), and the gas is removed. The mass is dipped into molten tin at a temperature above 1000 degrees, which floats on the surface due to its lower density. The thinner the mass that goes into the tin bath, the thinner the glass that comes out. Making glass The finishing touch is gradual cooling.

   Baking soda helps reduce the melting point by 2 times. If you do not add it, it will be very difficult to melt the sand and, accordingly, connect individual grains of sand with each other. Lime is needed so that the mass can withstand water.

5. Quartz sand, lime and soda
6. Well, actually it’s made from quartz sand
7. Glass is produced by melting a mixture of sand and other mineral components, which depends on the brand of glass. For example, crystal glass, which is used to make decorative glassware, contains significant amounts of lead. When pure quartz sand is melted, quartz glass is obtained - it is very refractory and viscous in the melt, so that it does not even turn out transparent due to the air bubbles remaining in it. It has a tiny coefficient of thermal expansion - if you heat it until red and put it in water, it will not crack. It is used in the manufacture of laboratory glassware, glass heating elements for laboratories and industry, etc. To obtain optical quartz glass that transmits ultraviolet light, rock crystal is melted - this is the same as quartz sand, pure SiO2, but coarse-crystalline, which is rare in nature.

   To Vasilchenko's answer. Previously, uranium glass was made to make decorative dishes - an amazing yellowish-green color, products from it can be seen in Moscow in the Kuskovo Museum. With the discovery of radioactivity, the production of such glass was stopped.
   To protect against radioactive radiation, screens made of lead glass are used - it contains even more lead than decorative crystal glass and has a yellowish tint. Picture tubes for monitors are made from the same glass to protect the PC user from the flow of electrons from the “electron gun” of the picture tube.

8. Ordinary glass contains approximately 70% silicon dioxide, which is found in the same form in quartz and in its polycrystalline form, sand. Glass composition

   Pure silica (SiO2) has a melting point of approximately 2000 degrees, and is primarily used to make glass for specialty devices. Typically, two more substances are added to the mixture to simplify the production process. Firstly, it is sodium carbonate (Na2CO3), or potassium carbonate, which lowers the melting point of the mixture to 1000 degrees. However, these components contribute to the dissolution of glass in water, which is extremely undesirable. Therefore, another component, lime (calcium oxide, CaO), is added to the mixture to make the composition insoluble. This glass contains approximately 70% silica and is called soda-lime glass. The share of such glass in the total production volume is approximately 90%.

   Just like lime and sodium carbonate, other components are added to regular glass to change its physical properties. Adding lead to glass increases the refractive index of light and noticeably increases gloss, and adding boron to the mixture changes the thermal and electrical properties of the glass. Thorium oxide gave glass the high refractive index and low dispersion needed in the production of high-quality lenses, but due to its radioactivity, it was replaced by lanthanum oxide in modern products. Iron additives in glass are used to absorb infrared radiation (heat).

   Metals and their oxides are added to glass to change its color. For example, manganese is added in small quantities to give glass a green tint, or in higher concentrations the color of amethyst. Like manganese, selenium is used in small doses to decolorize glass, or in large concentrations to impart a reddish color. Small concentrations of cobalt give glass a bluish tint. Copper oxide gives a turquoise light. Nickel, depending on the concentration, can give glass a blue, purple or black color. Depending on the composition of the glass, its color can be influenced by heating or cooling. #9679; Chemical composition, % :
   SiO2 - 72.2
   Al2O3 - 1.7
   CaO+MgO 12.0
   Na2O+K2O 13.7
   SO3 - 0.3
   Fe2O3 - 0.1

9. Made from quartz sand.
10. Made from silicon using electrolysis.

Glass is the most ancient object that has been found by man and is still used today. Found because a person did not invent it himself and made it for the first time. Most likely, the first glass appeared many thousands of years ago from volcanic lava. Nowadays this substance is commonly called obsidian. How is glass made? Let's go back to the times when he didn't exist yet. Gradually, people became aware of the surrounding nature and noticed that when natural soda was mixed with sand and then heated, a transparent substance appeared. This is how they became aware of this new type of material. This process was described by Pliny, the ancient Greek encyclopedist. It was from that moment that the history of the use of glass began, which has become absolutely indispensable in our lives today. After all, now it is used everywhere.

However, there is another theory regarding how glass is made, or more precisely, how it was made before. Some scientists decided that the glassy material was discovered as a by-product of copper smelting or roasting. In human life, this product played a truly outstanding role. It is difficult to overestimate its importance. The production of sheet glass is comparable to such discoveries as the making of fire and the invention of the wheel. During the times of Ancient Egypt, it was customary to make all kinds of jewelry from it. Later they learned to make containers for liquids from it. From the thirteenth century there was a sharp increase in the amount of glass produced. Venice became the center of its production. The masters became aware of the technology for creating oriental glass, after which they began to develop and improve it. The transparency of glass became possible thanks to the addition of various impurities to it. Masters began to make various dishes from it, which were very thin and elegant. In those days, glass products served more as luxury items and decorations.

If the question of how glass is made is still interesting to you, then you can talk about how it found more and more new areas of application. Its production technology has improved. A mirror was invented, this was done by applying amalgam to one side. Glass also began to be used in construction. It was usually used in the construction of palaces and temples. And after the craftsmen learned how to make it in color, they began to decorate windows with it, making beautiful stained glass windows. And now glass is widely used for fusing. And over time, glass began to be used in science. Thanks to the discovery of its ability to concentrate and scatter light, various lenses were created, telescopes and microscopes were made. These discoveries became a giant step in the development of the natural sciences - medicine, biology, astronomy, physics and others. No activity in any scientific field is possible without glass.

How is glass made? Like once before, made of sand. At its core, sand contains quartz, presented here in the form of crystals. When heated it melts. If you cool it quickly, the minerals will not have time to crystallize, becoming transparent. To give the product any color, oxides of different metals are added to it. To give the glass maximum transparency, the sand is cleaned so that it contains almost only quartz.

At the moment, there are many ways to obtain a product with different properties: reinforced, hardened, mirror, armored. The base is still simple sand, which is processed. It is important to say that there is still enough sand on the planet, so glass will not soon go out of our use.

Today we will talk about how to make glass yourself at home with your own hands. We will also consider methods and technologies for independent production of glass and glass products, namely furnaces, devices and tools for melting glass

In factories and chemical laboratories, glass is produced from a charge - a thoroughly mixed dry mixture of powdered salts, oxides and other compounds. When heated in ovens to very high temperatures, often above 1500°C, salts decompose into oxides, which, interacting with each other, form silicates, borates, phosphates and other compounds that are stable at high temperatures. Together they make up glass.

We will prepare so-called fusible glasses, for which a laboratory electric furnace with a heating temperature of up to 1000°C is sufficient. You will also need crucibles, crucible tongs (so as not to get burned) and a small flat plate, steel or cast iron. First we will weld the glass, and then we will find a use for it.

Mix with a spatula on a sheet of paper 10 g of sodium tetraborate (borax), 20 g of lead oxide and 1.5 g of cobalt oxide, sifted through a sieve. This is our batch. Pour it into a small crucible and compact it with a spatula so that you get a cone with the top in the center of the crucible. The compacted charge should occupy no more than three-quarters of the volume in the crucible, then the glass will not spill.

Using tongs, place the crucible in an electric furnace (crucible or muffle), heated to 800-900 °C, and wait until the charge melts. This is judged by the release of bubbles: as soon as it stops, the glass is ready. Remove the crucible from the furnace with tongs and immediately pour the molten glass onto a clean steel or cast iron plate. Cooling on the stove, the glass forms a blue-violet ingot.

To obtain glasses of other colors, replace cobalt oxide with other coloring oxides. Iron(III) oxide (1-1.5 g) will color the glass brown, copper(II) oxide (0.5-1 g) - green, a mixture of 0.3 g of copper oxide with 1 g of cobalt oxide and 1 g iron (III) oxide—black. If you take only boric acid and lead oxide, the glass will remain colorless and transparent. Experiment yourself with other oxides, for example, chromium, manganese, nickel, tin.

Grind the glass with a pestle in a porcelain mortar. To avoid injury from the fragments, be sure to wrap your hand in a towel and cover the mortar and pestle with a clean rag.

Pour fine glass powder onto thick glass, add a little water and grind until creamy with a chime - a glass or porcelain disk with a handle. Instead of a chime, you can take a small flat-bottomed mortar or a polished piece of granite - this is what the old masters did when they ground paints. The resulting mass is called slip. We will apply it to the surface of aluminum in much the same way as they do when making jewelry.

Clean the aluminum surface with sandpaper and degrease by boiling in a soda solution. On a clean surface, draw the outline of the design with a scalpel or needle. Using a regular brush, cover the surface with slip, dry it over a flame, and then heat it in the same flame until the glass is fused to the metal. You will get enamel.

If the icon is small, it can be covered with a layer of glass and heated entirely in a flame. If the product is larger (say, a sign with an inscription), then you need to divide it into sections and apply glass to them one by one. To make the enamel color more intense, reapply the glass. In this way, you can obtain not only decorations, but also reliable enamel coatings to protect aluminum parts in all kinds of devices and models. Since in this case the enamel bears an additional load, it is advisable to cover the metal surface with a dense oxide film after degreasing and washing; To do this, it is enough to hold the part for 5-10 minutes in an oven with a temperature just below 600°C.

Of course, it is more convenient to apply slip to a large part not with a brush, but with a spray bottle or simply by watering (but the layer should be thin). Dry the part in an oven at 50-60°C, and then transfer it to an electric oven heated to 700-800°C.

You can also make painted plates for mosaic work from fusible glass. Cover pieces of broken porcelain (they will always be given to you at a china shop) with a thin layer of slip, dry at room temperature or in an oven and fuse the glass onto the plates, keeping them in an electric oven at a temperature not lower than 700°C.

Having mastered working with glass, you can help your colleagues from the biology club: they often make stuffed animals, and stuffed animals need different-colored eyes...

In a steel plate about 1.5 cm thick, drill several recesses of different sizes with a conical or spherical bottom. In the same way as before, fuse the different colored glasses. The gamma is probably enough, but to change the intensity, slightly increase or decrease the content of the coloring additive.

Place a small drop of brightly colored molten glass into the recess of the steel plate, then pour in the iris-colored glass. The drop will enter the main mass, but will not mix with it - this way both the pupil and the iris will be reproduced. Cool items slowly, avoiding sudden temperature changes. To do this, remove the hardened but still hot “eyes” from the mold with heated tweezers, place them in loose asbestos and cool them to room temperature. .

Of course, fusible glass can also be used in other applications. But wouldn't it be better if you look for them yourself?

And to complete the experiments with glass, using the same electric furnace, we will try to turn ordinary glass into colored glass. A natural question: is it possible to make sunglasses this way? It is possible, but it is unlikely that you will succeed the first time, because the process is capricious and requires some skills. Therefore, take up glasses only after you have practiced on pieces of glass and made sure that the result meets your expectations.

The base paint for glass will be rosin. You previously prepared driers for oil paints from resinates, acid salts that make up rosin. Let us turn again to resinates, because they are capable of forming a thin, even film on glass and serving as carriers of coloring matter,

Dissolve pieces of rosin in a solution of caustic soda with a concentration of about 20%, stirring and remembering, of course, caution until the liquid turns dark yellow. After filtering, add a little solution of ferric chloride FeCl3 or other ferric salt. Keep in mind that the concentration of the solution should be small, salt cannot be taken in excess - the precipitate of iron hydroxide that forms in this case will interfere with us. If the salt concentration is low, then a red precipitate of iron resinate is formed - this is where it is needed.

Filter the red precipitate and dry it in air, and then dissolve it until saturated in pure gasoline (not automobile gasoline, but solvent gasoline); it would be even better to take hexane or petroleum ether. Using a brush or spray paint a thin layer of glass on the surface, let it dry and place in an oven heated to approximately 600°C for 5-10 minutes.

But rosin is an organic substance, and it cannot withstand this temperature! That's right, but that's exactly what you need - let the organic base burn out. Then a thin film of iron oxide will remain on the glass, well adhered to the surface. And although the oxide is generally opaque, in such a thin layer it transmits some of the light rays, i.e., it can serve as a light filter.
Perhaps the light-protective layer will seem too dark to you or, on the contrary, too light. In this case, vary the experimental conditions - slightly increase or decrease the concentration of the rosin solution, change the firing time and temperature. If you are not satisfied with the color in which the glass is painted, replace the ferric chloride with the chloride of another metal, but certainly one whose oxide is brightly colored, for example, copper or cobalt chloride.

And when the technology is carefully developed on pieces of glass, it is possible to transform ordinary glasses into sunglasses without much risk. Just remember to remove the glass from the frame - the plastic frame will not withstand heating in the oven in the same way as the rosin base...
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To make glass, sand must be melted. You've probably walked on hot sand on a sunny day, so you guess that to do this it needs to be heated to very high temperatures. An ice cube melts at a temperature of about 0 C. Sand begins to melt at a temperature of at least 1710 C, which is almost seven times higher than the maximum temperature of our usual oven.
Heating any substance to such a temperature requires a lot of energy, and therefore money. For this reason, when producing glass for everyday needs, glassmakers add a substance to the sand that helps the sand melt at lower temperatures - about 815 C. This substance is usually soda ash.
However, if you use only a mixture of sand and soda ash when melting, you can get an amazing type of glass - glass that dissolves in water (frankly, not the best choice for glasses).

The glass commonly used to make windows, mirrors, glasses, bottles and light bulbs is called soda-lime silicate glass. This glass is very durable, and when molten it is easy to shape into the desired shape. In addition to sand, soda ash and limestone, this mixture (experts call it “mixture”) contains some magnesium oxide, aluminum oxide, boric acid, as well as substances that prevent the formation of air bubbles in this mixture.

All these ingredients are combined and the mixture is placed in a giant furnace (the largest of these furnaces can hold almost 1,110,000 kg of liquid glass).

The high heat of the oven heats the mixture until it begins to melt and changes from a solid to a viscous liquid. Liquid glass continues to be heated at high temperatures until all the bubbles and veins disappear from it, since the thing made from it must be absolutely transparent. When the glass mass becomes homogeneous and clean, reduce the heat and wait until the glass turns into a viscous viscous mass - like hot iris. The glass is then poured from the furnace into a casting machine where it is poured into molds and shaped.
However, when producing hollow objects such as bottles, the glass must be blown out like a balloon. Previously, glass blowing could be seen during fairs and carnivals, but now this process is often shown on TV. You've probably seen glassblowers blowing hot glass at the end of a tube to create amazing shapes. But glass can also be blown using machines. The basic principle of glassblowing is to blow into a glass drop until an air bubble forms in the middle, which becomes a cavity in the finished piece.

After the glass is given the required shape, a new danger awaits it - it can crack when cooled to room temperature. To avoid this, craftsmen try to control the cooling process by subjecting the hardening glass to heat treatment. The last stage of processing is removing excess glass droplets from the handles of cups or polishing plates using special chemicals that make them perfectly smooth.

Scientists are still debating whether glass should be considered a solid or a very viscous (syrup-like) liquid. Because the glass in the windows of older houses is thicker at the bottom and thinner at the top, some claim that the glass drips over time. However, it can be argued that previously window glass was not made perfectly straight and people simply inserted them into the frames with the thicker edge down. Even glassware from the times of Ancient Rome does not show any signs of “fluidity”. Thus, the example of old window glass will not help resolve the question of whether glass is actually a highly viscous liquid.

Composition (raw materials) for making glass at home:
Quartz sand;
Soda Ash;
Thalamit;
Limestone;
Nepheline syenite;
Sodium sulfate.

How glass is made at home (production process)

Typically, scrap glass (broken glass) plus the above components are used as ingredients.

1) The constituent elements of the future glass enter the furnace, where it all melts at a temperature of 1500 degrees, forming a homogeneous liquid mass.

2) Liquid glass enters a homogenizer (an apparatus for creating stable mixtures), where it is mixed to a mass with a uniform temperature.

3) The hot mass is allowed to settle for several hours.

This is how glass is made!