24 Jun 2019

Lexan

Polycarbonate Sheets

The more accurate name should be polycarbonate cellboard because straight plastic plates, trapezoidal and corrugated plates and interlocking panels of a variety of profile, format, and trapezoidal and corrugated panels are used in the construction for thermally insulating unbreakable glazing, roofing and roofing. and features.

Polycarbonate is a relatively new material – it was synthesized only in 1953 independently of each other in Bayer AG (Makrolon) and General Electric (Lexan). Chemically it is a polyester of carbonic acid (diphenyl carbonate or dimethyl carbonate). Around the 1970s, applications have been gradually developing in the construction industry. These include all flat and arc glazing – roofing of terraces, skylights and light strips, conservatories and greenhouses, pergolas, swimming pools, railings, as well as street furniture, noise barriers, as well as large-area roofing (sports stadiums, etc.).

Polycarbonate combines several properties that do not occur with any other material. High is its impact strength, almost constant in an unusually wide temperature range (from -40 to +120 degrees C). Compared to glass, this value is up to 200x for polycarbonate, 4x for PVC and 10x for PMMA. Due to the above-mentioned properties and high ester value, polycarbonate sheets replace glass with different types of glazing both in exterior and interior. Furthermore, the material is characterized by low specific weight, high light transmittance (over 80% – depending on the type and thickness of the board) and excellent weather resistance. Combined with a one- or two-sided co-extruded UV filter, it has a high resistance to aging due to climatic changes: UV protection keeps both optical and mechanical properties.

The polycarbonate extensibility is 0.065 mm / m ° C. During installation, the expansion clearance of 3 mm per meter in both directions must be taken into account. According to reaction to fire, polycarbonate is classified according to ČSN EN 13501-1 into class B. The flame spread index is 0.00 mm / min. matter like burning does not drip or fall off.

Smaller thickness sheets (8 and 10 mm) have a double-skinned structure, higher thicknesses have a multi-wall structure (3, 4, 5, 7), with crosses (X) stiffeners or honeycomb ). Can be installed straight or cold bent. If the polycarbonate bending radius is not a smaller minimum recommended radius, the bend does not have a negative effect on the mechanical properties of the plates, but the load capacity increases due to the resulting vault. In addition to clear plates, the standard colors are bronze and milky (opal), but other shades may occur. The length is usually 6 and 7 m (Arla Plast and Dektrade do not mention the lengths, but we assume that they do not deviate from normal practice).

Domestic sources of cellular polycarbonate sheets. They are known under various trade names – Makrolon, Marlon, Lexan, Akyver, Polydar, Gutagliss, multiclear, Decolar, Dekplastic, Macrolux, or others, but the material is essentially the same. Some companies sell polycarbonate of the same brand – Makrolon besides Zenity and Dosting, Ravago Resinex CZ and Klahos, Akyver except Thony Thyssen Plastic and Titan-Multiplast and Werona. Material of Italian company POLYU s.r.l. such as PAMA and Vydos. Daufort boards have a reinforced outer wall and are designed for increased mechanical stress.

Until recently, all material came from abroad without exception. In 2006, Arla Plast AB, a Swedish company in Kadaň, opened a production plant that produces Multiclear cellular plates and, according to its own judgment, already accounts for about 50% of the market. She sells the records through a network of trading companies, each with its own pricing policy. One of these companies is Dektrade. In addition, a number of companies are manufacturing polycarbonate sheets for skylights, conservatories and other roofing and cladding.

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