The hoses are made with a special formulation using Inovyn resin K57 and K64. Manufacturing of spiral hoses is carried out by coextrusion of flexibile (plasticised) and rigid (unplasticised) PVC compounds. Preliminary laboratory tests were successfully completed at up to -65 degrees Celsius. The production flow is also achieved so that the capacity and quality are excellent. They come in appropriate colours for different purposes: agriculture, waste/water drainage, underground mines breathing air supply,etc).