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The maximum amount of bending of the longest side for unstrengthened ducts is defined in DIN 4740 Part 5 for PVC and in DIN 4741 Part 5 for PPs.



All ducts and fittings can be supplied in the following materials:
PPs, flame-resistant according to DIN 4102 B1
PE, specially stabilised for outdoor use
PVC, flame-resistant according to DIN 4102 B1


On the basis of the following date, COLASIT calculates and defines the optimum type of strengthening as required:

   ♦   max. edge length
   ♦   max. over-pressure and under-pressure in the ducting
   ♦   Temperature of medium passing through
   ♦   Permitted amount of bending  


Types of strengthening
External strengthening using welded-on reinforcement profiles or internal stiffening using tubing.


The following documentation is available in PDF format: