High performance plastics for the chemical processing industry
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High performance plastics for the chemical processing industry Chemical processing industry

Durostone® Verbindungselemente/Fasteners Röchling Group Competence in plastics With sales of € 1.8 billion and 10,000 employees at 90 locations in 25 countries, the global Röchling Group stands for competence in plastics. We leverage the unique innovation potential of this material – from semifinished products right through to complex systems. Röchling Industrial The Industrial Division serves almost all sectors of industry with application-oriented optimal materials. To do so Röchling has the most comprehensive product portfolio of thermoplastics and composites worldwide. Semi-finished...

High performance plastics for the chemical processing Industry High performance plastics for the chemical processing industry Thermoplastics have been implemented in the chemical industry as a material for tanks and plants for many decades now. Ranking amongst the most important fields of activity are: • Tanks for storing liquids • Galvanic plants • Steel-pickling plants • Water-treatment plants Complete system Röchling Industrial has one of the largest product ranges for chemicaltank and plant construction. We offer a complete system for your application – comprising sheet material, U and...

Tanks for storing liquids Moulding compounds with DIBt approval For application in tanks for storing liquids in chemical-tank and plant construction, plastics must fulfill varying demands: Included here is resistance to thermal and chemical corrosion as well as static loading and – depending on the set-up – resistance to weathering influences. Röchling’s wide product range offers just the right solution for practically any application. Tank variants Round tanks are mainly used for storing liquids. Round tanks can be made of sheet material, in a strip winding process or as composite tanks....

Galvanic plants In galvanic plants, items are provided with a metallic coating in an electrochemical process in order to increase their corrosion resistance. Metals that are typically applied here are nickel and copper. Also falling under the category of galvano technique or electroplating are such processes as chrome-plating machine parts, zink-coating nuts and bolts as well as anodic oxidation of aluminium parts (anodisation). Due to the diversity of these chemical processes, various plastics from Röchling are used in galvanic plants. Depending on the kind of application concerned, the...

Steel-pickling plants In the pickling process, cold-rolled steel bands are rid of the scaling incurred on the surface by the hot-rolling process. In the last two decades, application of polypropylenes in pickling tanks has been timetested and is ever increasingly substituting rubberised or brick lined steel tanks. Typical process conditions in steel-pickling plants are: • Medium: HCl 10 – 20% temperature: 80 °C – 90 °C With medium mixtures causing stress cracks such as HF-HNO 3, Röchling recommends the application of the softer PP-R. Softer thermoplastic material types can absorb the...

Water-treatment plants Water treatment has great importance for the quality of life of people throughout the world. About two million people die as a consequence of impure water every year, and on the global scale about two billion do not have adequate access to clean water. The plastics used in water treatment must have a high degree of purity for contact with drinking water and be particularly chemicalresistant. Röchling offers one of the biggest product ranges for water treatment: The plastics used have good chemical resistance, possess the high purity required and fulfill the current...

Exhaust-air cleaning plants In order to minimise damage to health and the environment through air-borne pollutants, there are different regulations and directives in many countries to restrict the pollutant loads in emissions. This frequently makes waste-air purification necessary. Typical plants for waste-air purification are droplet separators and gas scrubbers: In droplet separators, upward exhaust air is conducted into tanks through incorporated components. Here, the toxic substances are deposited onto these fittings as droplets and collect in the lower part of the tank. In gas...

Ventilation plants Removal of polluted air is an important challenge in buildings and chemical plants. Both ventilator construction as well as provision of air ventilation ducts and housings for plant parts are included in the field of ventilation plants. Röchling’s plastics are also used here on the basis of their good chemical resistance and outstanding processing properties. Polystone® PVDF FM is frequently implemented here as an inliner for ducts made of glass-fibre-reinforced plastics. Should the static, thermal and chemical load permit, complete plants are made of PE, PP or PVC....

Polyethylene (PE-HD) Polyethylene has a simple molecular structure. CH2 segments are lined up in a simple form. Depending on the polymerization process however, polyethylene can be manufactured with different densities. The different densities result from the number of cross branches between the main molecular chains. Further, the greater the number and length of the branches between these chains the lower the crystallinity of the resulting material, and therefore, the lower the density. Molecular structure of polyethylene Polyethylene has the following typical properties: • Low density •...

Requirements made on a PE 80 shown by means of the creep-strength curves of DVS 2205, Part 1. A PE 80 should retain a minimum strength of 8 N/mm² at a working temperature of 20 °C over a service life of 50 years. Requirements made on a PE 100 shown by means of the creep-strength curves of DVS 2205, Part 1. A PE 100 should retain a minimum strength of 10 N/mm² at a working temperature of 20 °C over a service life of 50 years. The raw materials for Polystone® G black B 100 used by Röchling are listed at the DIBt (German Institute for Civil Engineering), thus meeting the requirements defined...