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.
Advanced Corrosion-Protected Infrastructure Grade. Engineered for modern post-tensioned slab systems and foundation engineering, our 0.5-inch 7-wire unbonded prestressed concrete steel strand features premium anti-corrosion grease and a robust HDPE/PP protective sheath, ensuring exceptional durability, low-relaxation performance, and certified compliance with global civil standards.
7-Wire Low Relaxation Unbonded Prestressing Strand (0.5 inch / 12.7mm) | Greased & Sheathed PC Strand
​Designed for critical post-tensioned floor systems, parking structures, and ground anchors. Every coil adheres to stringent international mechanical benchmarks.
|
Technical Parameter |
Specification Value |
Governing Standard |
|
Nominal Diameter |
12.7 mm (0.500 inch / 1/2") |
ASTM A416 / A416M |
|
Strand Configuration |
7-Wire (1 Center Wire + 6 Helical Outer Wires) |
BS 5896 / ASTM A416 |
|
Nominal Cross-Sectional Area |
98.7 mm² (0.153 in²) |
ASTM A416 |
|
Specified Tensile Strength |
1860 MPa (Grade 270) |
ISO 6934-4 / ASTM A416 |
|
Minimum Breaking Load (MBL) |
≥ 183.8 kN (41,300 lbs) |
ASTM A416 |
|
Coating & Sheathing |
Anti-Corrosion Grease + Extruded HDPE/PP Sheath |
ASTM A960 / PTI Specs |
|
Relaxation Class |
Class 2 (Low Relaxation, Max 2.5% at 1000h) |
JIS G3536 |
· ​Superior Multi-Layer Corrosion Protection: Each strand is uniformly coated with specialized anti-corrosion grease and tightly encased in a seamless, high-density polyethylene (HDPE) sheath to prevent moisture and chemical attack.
· ​Optimized Low-Relaxation Performance: Advanced thermal-mechanical stabilization minimizes long-term stress loss, securing stable prestressing force retention over extended commercial lifecycles.
· ​Enhanced Flexibility in Construction: Unbonded tendons allow for easy stressing and positioning during construction, making them ideal for complex flat-slab and waffle-slab designs.
· ​Full Traceability & Certification: Manufactured under stringent ISO 9001 protocols. Each commercial shipment includes a detailed Mill Test Certificate (MTC) verifying mechanical performance and coating thickness.
​Engineered for modern high-load structural floor systems and geotechnical projects:
· ​Commercial & Residential Buildings: High-rise office buildings, multi-story parking structures, and flat-plate concrete floor systems.
· ​Industrial Structures: Large-span industrial floor slabs, foundations, and heavy-duty storage platforms.
· ​Geotechnical Engineering: Rock and soil anchor systems, slope stabilization, and foundation tie-backs.
​Q: What materials are used for the grease and protective sheath?
A: We use specialized microcrystalline wax-based anti-corrosion grease that remains stable across wide temperature ranges, encased in a tough, UV-resistant high-density polyethylene (HDPE) or polypropylene (PP) extrusion sheath meeting PTI specifications.
​Q: Do these unbonded strands comply with ASTM A416?
A: Yes. The base steel strand complies strictly with ASTM A416 Grade 270 (or equivalent international standards), while the protective coating and sheathing meet relevant PTI and ASTM requirements.
​Q: What is the standard packaging and container load?
A: Coils are securely strapped, wrapped in protective materials, and palletized to prevent damage to the plastic sheath during transit. A standard 20ft container loads approximately 20 to 27 metric tons.
