defem: Mesh Trays & CombiRacks

Defemmesh trays 80 Corrosion classes The life expectancy of a cable support system is dependent on the environment in which it is placed. Therefore, it is important to establish the corrosive properties of an environment to ensure that the right treatment and the right material are chosen. The table below shows various corrosion classes. As a guide, we have included the surface treatment recommended by Schneider Electric for the different classes. Table A Corrosion classes as stipulated by SS-EN ISO 12944-2 with atmospheric corrosion levels and examples of the environment in which they are most suitable for use. Corrosion class Environmental corrosion Examples of typical environments in temperate climates (informative) Outdoors Indoors C1 Very low – Heated areas with arid atmosphere and insignificant quantities of pollutant, e.g. offices, shops, schools and hotels. C2 Low Atmospheres with low levels of airborne pollution. Rural areas. Non-heated areas with fluctuating levels of tempera- ture and humidity. Few in- stances of condensation and low levels of airborne pollution, e.g. sports halls and warehouses. C3 Average Atmospheres containing some salt or average levels of air- borne pollution. Urban and light industrial areas. Areas affected by coastal conditions. Areas with average levels of humidity and some airborne pollution resulting from pro- duction processes, e.g. brewer- ies, dairies, laundries. C4 High Atmospheres with average salt content or discernible levels of airborne pollution. Industrial and coastal areas. Areas of high humidity and considerable airborne pollution as the result of production processes, e.g. chemical plants, swimming pools and dockyards. C5-I Very high (industrial) Industrial areas with high levels of humidity and aggressive atmospheres. Areas with almost permanent condensation and large quantities of airborne pollution. C5-M Very high (marine) Coastal and offshore areas with high salt content. Areas with almost permanent condensation and large quantities of airborne pollution. Schneider Electric designation Electro-galvanized DIN 50961/ISO 2081 Pre-galvanized Z 275 in accordance with SS-EN 10327:2004 Hot-dip galvanized after manufacture in accordance with EN-ISO 1461:2009 Zinkpox ® HDG+powder coating* Stainless steel SS2333 AISI 304L Stainless steel SS2348 AISI 316L Corrosion class Mass loss per surface unit and thickness reduction (1 year of exposure) 1 Steel Zinc Mass loss (g/m 2 ) Thickness reduction (µm) Mass loss (g/m 2 ) Thickness reduction (µm) C1 <_ 10 <_ 1.3 <_ 0.7 <_ 0.1 C2 > 10 to 200 > 1.3 to 25 > 0.7 to 5 > 0.1 to 0.7 C3 > 200 to 400 > 25 to 50 > 5 to 15 > 0.7 to 2.1 C4 > 400 to 650 > 50 to 80 > 15 to 30 > 2.1 to 4.2 C5-I > 650 to 1500 > 80 to 200 > 30 to 60 > 4.2 to 8.4 C5-M > 650 to 1500 > 80 to 200 > 30 to 60 > 4.2 to 8.4 Table B Mass losses for steel and zinc in various corrosion classes 1 Corrosion speed is generally higher when the material is first exposed On the next page, we briefly outline the various surface treatments and materials. As regards environmental corrosion, a steel design component can usually be assigned to one of the corrosion classes (C1 to C5-M) as shown in table A. Reference values for the average level of corrosion in steel and zinc are given in table B. The corrosion classes comply with those stipulated in SS-EN ISO 12944-2. * Only for Cable Ladders and Cable Trays ** Only for Cable Ladders