Structure: In standard version the wall is of gray plasticized PVC, with white coil of hard PVC, smooth on inside. In explosion-proof version copper strand coil is imbedded in the external wall of conduits parallel to hard PVC. Its role is to carry off any electrostatic charges.   Application: Elastic conduits in standard (ventilation) version are intended for removal of dust and vapors, for sawdust and yarn sucking, in ventilation industry and dust removing equipment.   Temperature range: -20oC to + 55oC

Quality Requirements:
TWT-ZP-2/2000

Elastic conduits in explosion-proof version are intended for application in systems, in which explosive atmosphere may or does occur. Electrical charges will be effectively carried off from wires on meeting the following conditions:

For zones Z1, Z2, Z11 
All elements mounted on a conduit: connectors, terminals of conducting materials shall be connected with copper strand line embedded in the wall of the conduit and grounded.
Conducting objects, between which the conduits are run, shall be connected with copper strand line and grounded. 

For zones Z0 and Z10
In case of expected conveying of liquids or dust-air mixtures, it is necessary to analyze individually the static-electricity protection of the whole process system.

Resistance to Vacuum:
Conduit subject to vacuum of 50 kPa for 10 min. at 23^oC should not exhibit any suck-backs/concavities or cracking:
Technical Specifications Table - Medium - Type 2;
Technical Specifications Table - Heavy - Type 3.