Contact Info
- Tel: +86-311-87813582
- Fax: +86-311-87829648
- Email: Kaiwork@126.com
- Whatsapp: +86 86 138 3318 2035
- Add: No.345, Youyi North Street, Shijiazhuang City, Hebei Province, China.
Ultimate Triple-Barrier Corrosion Protection. Engineered for aggressive coastal environments and high-stress geotechnical foundations, our grease-coated unbonded galvanized prestressed concrete steel strand combines a heavy-duty zinc-galvanized core, microcrystalline anti-corrosion grease, and a seamless virgin HDPE protective sheath, delivering uncompromising structural integrity and certified compliance with international civil standards.
Grease Coated Unbonded Galvanized PC Strand | Dual-Protected 7-Wire PT Tendon
​Designed for critical post-tensioned structures in extremely corrosive atmospheres. Every coil adheres to stringent international mechanical and protective benchmarks.
|
Technical Parameter |
Specification Value |
Governing Standard |
|
Available Diameters |
12.7 mm (0.5 inch) / 15.24 mm (0.6 inch) |
ASTM A416 / BS 5896 |
|
Strand Configuration |
7-Wire (1 Center Wire + 6 Helical Outer Wires) |
ASTM A416 / ISO 6934-4 |
|
Specified Tensile Strength |
1860 MPa (Grade 270 High Tensile) |
ASTM A416 |
|
Core Protection |
Heavy-Duty Hot-Dip / Electrolytic Galvanized |
ASTM A475 / EN 10244-2 |
|
Grease Coating |
Moisture-Displacing Microcrystalline Grease |
PTI / ASTM A960 Specs |
|
Sheathing Material |
Seamless Extruded Virgin HDPE (UV-Stabilized) |
PTI / ISO Standards |
|
Relaxation Class |
Class 2 (Low Relaxation, Max 2.5% at 1000h) |
JIS G3536 |
· ​Triple-Barrier Defense Mechanism: Integrates three independent protection layers—galvanized zinc coating on the steel wires, specialized microcrystalline grease, and an impermeable extruded HDPE outer sheath—providing absolute immunity to corrosion.
· ​High-Tensile Structural Core: Built upon premium 1860 MPa low-relaxation 7-wire steel strands, delivering robust breaking load reliability and structural safety factors.
· ​Unbonded Flexibility & Efficiency: Allows smooth tendon movement during post-tensioning stressing operations while maintaining complete isolation from aggressive surrounding media.
· ​Full Metallurgical & Protective Traceability: Manufactured under strict ISO 9001 protocols. Each commercial shipment includes a comprehensive Mill Test Certificate (MTC) verifying mechanical strength, zinc coating mass, and sheath integrity.
​Engineered for heavy-load structures exposed to severe marine, chemical, or high-humidity environments:
· ​Marine & Coastal Engineering: Cross-sea bridges, port wharfs, piers, offshore platforms, and coastal retaining walls.
· ​Aggressive Industrial & Civil Structures: Wastewater treatment facilities, chemical processing plants, and structures exposed to heavy de-icing salts.
· ​High-Capacity Geotechnical Anchors: Permanent rock and soil anchor systems in corrosive groundwater conditions.
​Q: Why combine galvanization with an unbonded grease/sheath system?
A: This dual-technology approach provides redundant protection (triple-barrier). Even if the outer HDPE sheath or grease layer is accidentally compromised during installation, the underlying galvanized zinc coating actively prevents rust formation.
​Q: Do these strands comply with international manufacturing standards?
A: Yes. The base steel strands and galvanization comply with ASTM A416 / BS 5896, and the grease/sheathing systems meet rigid PTI (Post-Tensioning Institute) performance specifications.
​Q: What is the standard export packaging and transport safety?
A: Coils are securely strapped, wrapped in heavy-duty moisture-proof materials, and palletized to prevent any physical abrasion or damage to the HDPE sheath during international containerized shipping.
