Metallic or polyethylene sheaths represent the most economical means to create voids in post-tensioned elements. They provide a good secondary protection against corrosion and a good connection between cables and concrete. The primary protection against corrosion is provided by the grouting alkalinity and by concrete itself, the secondary one by the sheath and its protective barrier to the cable.

ST metallic sheaths are available in different versions. They are made of crimped sheet EN 10139 – 1999. They can be galvanized. Sheaths are available in bars having a length of 5.8 m. They are all provided with a sleeve screwed onto each bar.

SL metallic sheaths are available in different versions. They are made of crimped sheet EN 10139 – 1999. They can be galvanized. Sheaths are available in bars having a length of 5.8 m. They are not all provided with a sleeve screwed onto each bar obtaining their connection by overlapping.

SP polyethylene sheaths are available in several versions. They are made of extruded H.D.P.E. according to the FIB Specification, in bars with a length from 5.8 m. to 11.8 m. They are blue with a heat-shrinking sleeve on each connection.

SPE-78x25x2 mm. polyethylene sheaths are made of extruded H.D.P.E. according to the FIB Specification, in bars with a length from 5.8 m. to 11.8 m. They are blue with a heat-shrinking sleeve on each connection.