What is the difference between plastic profiles of class A and B

Profile classification

A, B and C are three difficult letters. This is not a smart PR move, but a classification of a window profile, where the details and technical characteristics of the product are hidden. They talk about the thickness of the inner and outer walls, show the degree of protection from the sun, wind and rain. Well, they indicate the service life of the product. They are divided into classes according to GOST.

Types of polyvinyl chloride windows by opening mechanism

PVC windows open in several ways. The following opening mechanisms are distinguished:

• Hinged, when the sash opens inward relative to the horizontal hinges;
• Turning. The sash also opens inward, but narrower in relation to the vertical hinges;
• Tilt-and-turn. A very popular type of opening today, combining a rotary and a folding one.

Non-standard windows

Innovative technologies make it possible to produce profiles of various shapes, and adding pigment to the raw material allows you to obtain the desired color of the structure.

A high-quality PVC window can fit even into an exceptionally sophisticated interior. For example, round windows are often installed in the bathroom or corridor, triangular or trapezoidal in attics and attics, and bay windows in the veranda and winter garden. Unusual windows are an ideal solution for furnishing country cottages, as they fit perfectly into almost any modern architectural style.

Class A

The most reliable PVC structures are made from class A profile. The main properties are resistance to heat transfer, sound insulation, wind, rain, sun and increased service life.

Let's start in order. The heat transfer resistance coefficient of class A windows cannot be less than 0.75-0.8 m2 0 C/W. This means that the design - subject to the installation of a functional double-glazed window and proper installation - will not allow heat to escape from the room during the cold season (savings will be 25%). And in warm weather it will keep you cool. The noise insulation properties of the A-class profile are also excellent. Sounds are muffled to a level of 36 dB: this is soft human speech.

By the way, the strength of the weld in such structures is at least 70% - the values ​​are established in the regulatory and design documentation. Tests are carried out on a special tensile testing machine. The program shows the load on the corner joint, which receives a seam during operation. The test lasts 3 minutes. The result is considered satisfactory only if the test subject does not break under the load: cracks and other damage do not appear.

Where can I work?

First of all, a natural science profile opens the door to the medical profession. There are many directions and opportunities here. According to a study by Rabota.ru and SberIndex, a healthcare worker (in particular, a pharmacist) will become one of the most in-demand professions in 2021.

But the natural science profile is not only about medicine. You can become a specialist in the field of geodesy and land management, ecology and environmental management, geology and mineral development, bioengineering, reconstruction and restoration of cultural heritage sites, landscape architecture and other areas.

Here are a few professions you can get into after a natural science major:

• biologist/biochemist as a technical support and bioanalytics specialist - travels on business trips, is responsible for installation and training in the use of equipment that his company sells;
• biomedical engineer - designs medical equipment and prosthetics;
• bioinformatician - studies large-scale biological problems taking into account large volumes of data, understands molecular biology, genetics, computer science, mathematics and statistics;
• immunologist - assesses the state of a person’s defenses, creates vaccines and medicines, treats pathologies and rehabilitates;
• urban ecologist - designs new cities based on environmental biotechnologies. Already, high-tech green cities are being built in China, the United Arab Emirates and European countries;
• biochemical engineer - develops new equipment, robotic systems and software for biotechnological and medical laboratories;
• molecular nutritionist - develops individual nutrition plans based on data on the molecular composition of food, taking into account the results of a person’s genetic analysis and the characteristics of his physiological processes;
• biopharmacologist - creates new biological products with specified properties. Already today, a number of important drugs - for example, penicillin and insulin - are produced using genetically modified bacteria.

Related professions of the future are also emerging. Here are just a few from the Atlas of New Professions. Many already exist on the market:

• IT geneticist - deals with programming the genome according to specified parameters, in particular, preventing the development of hereditary diseases;
• ecologist-logistician - responsible for reducing the environmental footprint caused by the transportation of goods (CO₂ emissions), develops logistics solutions, optimizes routes and supply chains to reduce emissions;
• architect of living systems - designs closed-cycle technologies with the participation of genetically modified organisms and microorganisms, for example, calculates the required power of bioreactors or carefully considers a waste processing system;
• veterinarian-rehabilitator - rehabilitates wild animals injured due to oil spills, and works on “scare” programs from pollution areas to prevent the death of animals;
• a specialist in overcoming systemic environmental disasters - works with disasters that are extended over time and are gradually realized by people. For example, the Pacific plastic dump or melting permafrost.

Class B

The class B profile is not as good as its class A counterpart, but in some respects it is not inferior. As a rule, this profile is chosen for glazing seasonal and industrial facilities. The strength of finished structures is less, improved due to reinforcement and an increased number of chambers. However, tests according to DIN EN 12 608 indicate the following:

• 25% lower weld strength;
• 20% worse resistance to pulling out screws;
• 15% weaker dimensional stability.

At the same time, class B profiles do not lose popularity. Advantage in price and service life: 40 years.

What else should you pay attention to?

When choosing a profile, you should also take into account other consumer characteristics of the PVC profile for plastic windows - the width of the system and the number of chambers in the profile itself.

Frame width

The wider the profile, the thicker the installed glass unit can be. Air or inert gas pumped into a double-glazed window is an excellent barrier to the cold air environment from the outside. The width of the profile and the number of chambers directly affect heat saving.

Number of profile cameras

Thanks to the internal walls and partitions, the profile itself also contains a certain number of hollow chambers. The more partitions, the more internal chambers, which means higher energy efficiency and sound insulation. In addition, this affects the rigidity and strength of the structure. In modern PVC profile models there can be from 3 to 7 and even 8 chambers.

Class C

Let's take a closer look. Class C - windows that are intended for temporary glazing, suitable for warehouses, production workshops and commercial buildings. 10 years is the age allocated by the manufacturer. Even during this period, deformation will occur, the seal will be lost, and the windows will require expensive maintenance. Or better yet, a complete replacement.

Windows Art, Evolution, Smart, Lite'60, Lite'70 - from the most durable profile Melke offers its clients "Window Plastic". Only class A and higher profiles, Guardian multifunctional double-glazed windows, fittings from world-famous manufacturers - innovations in style and level of comfort.

Specialized education: catching pitfalls

If the profile class is not filled or the child decides to change direction, the way out of the situation may be to contact a tutor.
Organizing education according to the profile system often raises various difficulties, some of which we discussed above. Do you want your child to stay in his favorite school and not feel discomfort? Don't despair, we will find a solution to your problems.

• The profile class is not recruited. Often in schools, in order to open one of the specialized classes, a certain number of students are required to choose this direction. For example, your daughter is going to become a pharmacist, and other children from the same school are going to technical and economic universities. What if there are too few people willing to study in a science class? Many parents transfer their children to other schools where there is a suitable profile, but such a transfer can be accompanied by additional stress. The best option would be individual lessons and the introduction of elective courses for those interested.
• Related specialties. Your son is going to enroll as a psychologist, which requires in-depth knowledge of biology and social studies. At the same time, those who choose a natural science major study more biology, and social science – the humanities or socio-economics. In this case, it is worth making a choice in favor of a direction that is more difficult to learn, and the intricacies of another discipline will be left for self-education. Also, with specialized education, the services of a tutor do not cease to be relevant.
• Change of course. Often in the last year, many students choose a different profession than they wanted to get in the beginning. For example, a schoolboy studied in a physics and mathematics class, going to polytechnic, but in the last year he decided to become an economist. At the same time, transferring in 11th grade is almost impossible. The problem can be solved by introducing additional classes at school for non-specialists. For example, social studies lessons for math and science classes.
• Lack of qualified personnel. If the school does not have enough teachers who can provide in-depth knowledge in specialized subjects, you can invite teachers from universities. For example, in the humanities class, Russian, foreign languages ​​and literature are heavily taught, but the teaching of history leaves much to be desired. Invited teachers or enrollment in special courses will help solve the problem.

Professional education is an innovative learning model that helps in many areas. It allows schoolchildren, while receiving the necessary amount of general knowledge, to focus on disciplines that will be useful in the future. It develops independence and stimulates the desire to learn. All over the world and in Russia, the division into profiles is becoming increasingly popular and relevant.

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Prospects for a secondary profile

And in the future the situation promises to stabilize - however, this does not apply to all possible study profiles. Starting from 2015, it is planned to comprehensively test 8th and 9th graders every year in order to ultimately divide them into “techies” and humanities students. Schoolchildren will tell you in detail about themselves and receive advice on which specialized class they should go to, although they will not be able to oblige them to follow this recommendation. Once in a class “for physicists” or “for lyricists,” a student will see in the schedule more hours for studying the disciplines of his profile. However, there is another option: children study in the general stream, and for lessons in in-depth study of certain subjects they disperse into different classes. The opinion of experts is obvious: two profiles will not be enough.

Professional education: why is it needed?

As a rule, high school students are busy choosing their future direction of study. In most schools, division occurs in the tenth grade, sometimes earlier - from the eighth. It is generally accepted that by this age a child will have already developed a range of interests and plans for the future, and specialized education will help him deepen his knowledge and enter the desired university.

Thus, the specialized training system is designed to solve several important problems.

The profile training system is designed to improve independence, self-discipline, motivation and responsibility

• Deep knowledge of specialized disciplines. When knowledge in the subjects necessary to obtain a future profession is not enough for schoolchildren, they have to resort to the services of tutors or enroll in appropriate courses. Such pleasure can be expensive, and guarantees of catching up are not always given. This is where specialized training comes to the rescue: thanks to an increase in the number of hours devoted to the necessary disciplines and in-depth study, the child will learn all the necessary material.
• Orientation in the world of professions. By entering a class with a certain focus, the student will not only study more specialized subjects, but will also be able to learn more about his future profession and finally decide on his choice. For example, if your son chose to study natural sciences, he will be able not only to study chemistry and biology in depth, but also to become familiar with the features of medical, agricultural and other areas.
• Independence and desire to learn. A student loves history, but hates physics? When choosing a profile, he chooses those disciplines that are more to his liking and will be useful in the future. By devoting more time to studying his favorite subjects, his independence and desire to learn will increase. The system of specialized education is aimed at ensuring that every student can find something for which he will truly root with all his soul.
• Easy admission to university. Does your child see himself as a future financier and is going to enroll in the Faculty of Economics? Or does he want to become a pediatrician and go to medical school? Often, good universities require a high level of preparation for admission, which cannot be provided by a regular general education program. A specialized education system that pays a lot of attention to the necessary subjects and improves knowledge makes it much easier to enter the desired university.