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Unbonded PC strand, also called unbonded PC steel strand, has good corrosion resistance. On the strand or wire bundle’s surface, it is coated with special anti-corrosion grease, then covered by polyethylene plastic which commonly are the low-voltage high-density polyethylene (HDPE). Because of the anti-corrosion grease and polyethylene plastic, the steel strand in using can isolate from the concrete, thus making the steel strand itself freely move in the layer, in order to make the construction convenient. What’s more, unbonded PC strand tendons friction is small, and easily bent into many curved shape. Therefore, it is suitable for cast-in-place concrete floor, large load of precast beams and other special structures.

Specification
Diameter: 7.94 mm - 17.80 mm.
Appearance: polyethylene cover with grease coating.
Construction: 1 × 7.
Relaxation (1000h): not more than 2.5%.
Tensile strength: 1670 MPa, 1700 MPa, 1770 MPa, 1820 MPa, 1860 MPa, etc.
Standards: ASTM A416, BS 5896, JIS G 3536, ISO 6934, EN 10138, AS 1311, GB/T 5224 or according to customers' 
Features
Low relaxation and high tensile strength.
Not need room for future expansion.
Good corrosion resistance.
Convenient use.
Material saved.
Bended easily.
HDPE coated.
Applications
Prestressed concrete structures: concrete silo, retaining wall and dam.
Building structures: factories, high - rising buildings, building foundation columns, hollow floor, building slab.
Bridge and road structures: rail and road bridges, the city's overpass, PC bridges.
Protective structures: shell safety of nuclear power stations.
Water project structures: water towers, sewage treatment, water conservancy, hydro-power project, water pipes.
Other uses: television tower, poles, crane beam, earth anchor, rock anchor, etc.