Frost-resistant polyamide
The importance of polymers in the modern world is steadily increasing. However, with all the variety of valuable properties polymers have disadvantages, one of which is a partial or complete loss of performance at low temperatures, i.e. limited frost resistance.
The importance of polymers in the modern world is steadily increasing. However, with all the variety of valuable properties polymers have disadvantages, one of which is a partial or complete loss of performance at low temperatures, i.e. limited frost resistance.
Freeze-thaw resistance is the ability of polymer to retain performance at low temperatures. Quantitatively it is characterized either by the coefficient which is determined as a ratio of values of some parameter at reduced and normal temperatures (for example, ratio of sample deformation under the same load or ratio of loads required to produce the same deformation), or value of minimum temperature at which the required value of some parameter is within acceptable limits. For example, it may be the temperature at which more than 50% of identical samples do not collapse or the film rolled on the rod of a certain diameter does not collapse and does not crack, etc.
In turn, it is necessary to distinguish between technical and theoretical cold resistance. Technical cold resistance should be called the ability of polymeric materials under exposure to low temperatures for a certain period of time to maintain operational properties, namely, to develop the specified values of deformation, or to resist the destruction. Theoretical cold resistance is the lower temperature limit of the beginning of segmental mobility of macromolecular chains, when extremely small relaxation processes occur in the polymer at the given speeds of exposure and the value of deforming forces that prevent the destruction of polymer samples. That is why the frost resistance of polymeric material is often more important than the frost resistance of the product made of it.
When the temperature decreases, not only the mechanical but also dielectric, relaxation and other properties of polymers change significantly, which may also limit the use of polymeric materials at low temperatures. Frost-resistant polymeric materials, which can be used at minimum winter temperatures typical of the territory of Russia: from -40 to -60°C, are referred to.
Today there are many kinds of construction and engineering polymers. They are distinguished by the fact that they are used for manufacture of parts which bear sufficiently high thermal and mechanical loads and have high electrical insulating indices. Such types of polymers include polyamide.
Our company "Ar-bel" sells a range of polyamides for various purposes. In this list you can find frost-resistant polyamide, which is used in various spheres of production.
Application of frost-resistant polyamide
The problem of frost resistance is relevant for almost all areas of application of polymeric materials:
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household sphere (clothing and footwear, packaging of frozen foods, boxes and trays of refrigerators and freezers, tools);
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construction and housing and communal services (fastening of roofing, hydro- and thermal insulation materials, floor coverings, corrugated pipes for protecting cables and wires, as well as cable insulation elements);
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in the transport industries (automotive, shipbuilding, space and aviation industries): body parts, sealing elements, pipelines, hoses, glass bushings, cable insulation .;
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oil production, medicine and much more.
Advantages of frost-resistant polyamide
Among the unique properties of frost-resistant polyamide, the following can be distinguished:
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wide operating temperature range from -60 to +140 °С;
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high dimensional stability;
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low coefficient of friction on metals;
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high strength, even when working with abrasive particles;
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polyamide is 7 times lighter than metal counterparts;
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performs well in vibration conditions;
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resistant to chemical influences;
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contact of polyamide with drinking water and food is allowed.
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Contacts
e-mail: info@arbel.by