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12.7mm Unbonded PC Strand
The 12.7mm Unbonded PC Strand, also known as unbonded prestressed steel strand, is widely used in unbonded prestressed concrete systems where flexibility, durability, and cost efficiency are required. It is commonly applied in cast-in-place slabs, foundation piles, slope stabilization, and geotechnical engineering projects.
This unbonded strand does not require reserved ducts or bellows, allowing faster construction, simpler installation, and reduced material usage. Its flexible bending performance makes it especially suitable for recoverable anchor cable systems, significantly lowering overall engineering and maintenance costs.
The product complies with JG 161-2004. The steel strand conforms to GB/T 5224-2014, EN 10138 / BS 5896, or ASTM A416, based on project requirements. The HDPE sheathing meets GB 11116 and GB/T 9341, while the anti-corrosion grease complies with JG 3007-1993, ensuring long-term protection and stable performance.Key Advantages of 12.7mm Unbonded PC Strand
The 12.7mm Unbonded PC Strand is engineered to provide high strength, corrosion protection, and reliable prestressing performance in unbonded concrete structures.
Primary Advantages
High-Strength and Cost-Efficient Prestressing
Designed for unbonded prestressed concrete, this strand delivers strong load-bearing capacity while reducing construction complexity and total project cost.
Compliance with International Standards
All specifications comply with JG 161-2004, with steel materials meeting GB/T 5224-2014, EN 10138 / BS 5896, or ASTM A416, ensuring consistent quality and global applicability.
Why Choose This Unbonded Prestressed Steel Strand?
Steel Strand Features
Manufactured from high-tensile steel strands meeting international standards
Tensile strength grade exceeding 1920 MPa
Excellent straightness with bow height less than 2 mm per meter
Produced exclusively from new steel (no recycled or rusted material)
Clean surface, free from dust, oil, granules, or corrosive substances
Grease Features
High-quality anti-corrosion grease specifically developed for unbonded PC strand
Chemically stable and non-corrosive
Effectively blocks water, moisture, and corrosive agents
Provides excellent lubrication to reduce friction resistance
Stable across wide temperature ranges (no flow at high temperature, no brittleness in cold conditions)
This combination ensures long service life, reliable prestressing force, and reduced maintenance requirements.
What Sets Our Unbonded PC Strand Apart?
Compared with other manufacturers’ products, Tianjin WASUNGEN Metal Products Co., Ltd. delivers superior consistency and performance.
Our Advantages
Smooth and uniform surface with consistent sheath thickness
Excellent friction properties between strand and sheath (μ and κ values well controlled)
Minimal local deviation per meter length
Stable grease coating without leakage
Other Manufacturers’ Products Often Show:
Uneven surfaces with granulated impurities
Grease leakage from the coating
Inconsistent and poor friction performance
Choose our unbonded PC strand for precision manufacturing, reliable prestressing efficiency, and long-term structural safety.
Advanced Corrosion Protection System
The combination of HDPE sheathing and specialized anti-corrosion grease provides long-term resistance against moisture, chemicals, and environmental exposure.
Stable Friction Performance
Optimized friction coefficients ensure smooth stress transfer and reliable prestressing behavior throughout the service life of the structure.
Where Is 12.7mm Unbonded PC Strand Used?
The Unbonded PC Strand is primarily used in unbonded prestressed concrete structures and recoverable anchor cable systems, where flexibility and durability are essential.
Typical Applications Include:
Cast-in-place concrete slabs
Foundation piles
Slope stabilization systems
Geotechnical anchor projects
Recoverable anchor cables
Its use helps minimize construction cost, improve crack control, and maintain long-term structural efficiency.
YXXK-UPS Series Unbonded PC Strand (Ref. JG161-2004, Single-layer HDPE Sheathing)
| CODE | Steel | Grease | Sheathing thickness | μ | κ | ||
| W3 (g/m) | (mm) | ||||||
| Diameter (mm) | Section Area (mm2) | Tensile Strength (MPa) | (no less than) | (no less than) | |||
| YXXK-UPS9 | 9. 53 | 54. 84 | 1860 | 32 | 0. 8 | 0.04~ 0.1 | 0.003 ~ 0.004 |
| YXXK-UPS13 | 12. 7 | 98. 71 | 1860 | 43 | 1 | 0.04 ~ 0.1 | 0.003 ~ 0.004 |
| YXXK-UPS13 | 12. 9 | 100 | 1860 | 45 | 1 | 0.04 ~ 0.1 | 0.003 ~ 0.004 |
| YXXK-UPS15 | 15. 24 | 140 | 1860 | 50 | 1 | 0.04 ~ 0.1 | 0.003 ~ 0.004 |
| YXXK-UPS15 | 15. 7 | 150 | 1860 | 53 | 1 | 0.04 ~ 0.1 | 0.003 ~ 0.004 |
μ- Friction coefficient between steel strands and inner wall of sheath in unbonded prestressing tendon
κ - Friction coefficient considering local deviation per meter length of unbonded prestressing tendon
Why Choose This Unbonded Prestressed Steel Strand?
Steel Features:
Made from high-tensile-strength steel strands that meet international standards, with a T/S grade exceeding 1920 MPa.
Exceptional straightness, with bow height less than 2mm per meter.
Manufactured using only new steel; rusted or recycled steel is strictly prohibited.
Surface is free from dust, granules, oil, or corrosive substances.
Grease Features:
Coated with high-quality anti-corrosion grease specifically for unbonded PC strand applications.
Chemically stable, non-corrosive to surrounding materials.
Effectively blocks water, moisture, and corrosion.
Provides excellent lubrication to reduce friction resistance.
Stable across temperature ranges—won’t flow at high temperatures or become brittle in the cold.
This unbonded steel strand is ideal for ensuring the longevity and reliability of unbonded prestressed concrete structures, combining superior steel quality with advanced protective grease.
| Test Item | Test Ways | Requirement | |
| Work cone penetration | 25℃， 0.1mm | GB/T269 | 265-295 |
| Corrosion | 45# steel, 100℃,24hours | SH/T0331 | - |
| Drop point | ℃, no less than | GB/T4929 | 160 |
| Moisture | %, no more than | GB/T512 | 0.1 |
| Stencil oil | %,(100℃,24hours),no more than | SH/T0324 | 8 |
| Evaporation losses | %,(99℃,24hours),no more than | GB/T7325 | 2 |
| Low temperature performance | -40℃,30 minuts | SH0387 | - |
| Humid heat test | grade,(45#steel30D),no more than | GB/T2361 | 2 |
| Sailt spray analysis | grade,(45#steel30D),no more than | SH/T0081 | 2 |
| Oxidation Stability | 99℃,100hours,785kpa, pressure no more than | SH/T0325 | 147 |
| Oxidation Stability | acide value after oxidation mgKOH/g, no more than | GB/T264 | 1 |
| PH Value | - | PH test paper | 7. 0-8. 0 |
| Compatibility casing oil absorption | %,(65℃,40D),no more than | HG2-146 | 10 |
| Tensile strength change rate to casing compatibility | %,(65℃,40D),no more than | GB1040 | 30 |
HDPE Part:
| Properties | Test Ways | Requirements |
| Large and small grains, g/kg | SH/T 1541.1-2019 | ≤5 |
| Black grain, piece/kg | SH/T 1541.1-2019 | 0 |
| Color grains, piece/kg | SH/T 1541.1-2019 | ≤5 |
| Snake skin grains, piece/kg | SH/T 1541.1-2019 | ≤10 |
| Density (23℃), g/cm3 | GB/T1033.2 or ASTM D1505 | 0.9510+-0.0020 |
| Environmental Stress Crack Resistance | Condition A, F50,100% lgepal CO-630,ASTM D1693 | ≥30 hours |
| Condition B, F50:35; Bottles ESCR:250, 60℃, F50 | ||
| Melt Flow | Condition 190/2.16, ASTM D1238 | ≤0.35 g/10min |
| GB/T 3682. 1 | 1.0+-0.2 | |
| Tensile Strength | 2 in per min, ASTM D638 Type IV | ≥28MPA |
| Elongation at break | 2 in per min, ASTM D638 Type IV | ≥600% |
| Flexural Modulus | ASTM D790 | 1. 378Gpa |
| Brittleness Temperature | ASTM D746 | Max -118℃ |
Why Choose Our Unbonded Prestressed Concrete Steel Strand?
Our unbonded PC strand stands out in quality and performance compared to other factories’ unbonded prestressed concrete strands. Key advantages include:
Superior Appearance: Smooth, consistent surface with uniform thickness.
Excellent Friction Properties: The friction coefficient between the unbonded steel strand and the inner wall of the sheath is outstanding, ensuring optimal prestressing performance.
Minimal Local Deviation: Even considering local deviations per meter length, our unbonded prestressed concrete strands maintain a very low friction coefficient.
Other Manufacturers’ Products:
The surface often contains granulated impurities and is uneven.
The coating may leak grease.
Friction performance (μ and κ) is inconsistent and subpar.
Choose our unbonded PC strand for reliability, precision, and superior prestressing results.
Packaging & Delivery
The coil dimensions and weight of the 12.7mm Unbonded PC Strand can be customized according to client requirements while complying with JG 161-2004 and related handling standards.
All coils are securely restrained to prevent deformation during transport and are clearly marked with the unwinding direction. Upon agreement, additional protective measures such as packing paper or water-soluble oil film can be applied for enhanced protection during storage and shipment.
Global Supply & Export Markets
Tianjin WASUNGEN Metal Products Co., Ltd. supplies Unbonded PC Strand, including 12.7mm Unbonded PC Strand, to multiple international markets for prestressed concrete and geotechnical engineering projects.
South America - Unbonded PC Strand Supply
Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela.
Central Asia - Unbonded PC Strand Supply
Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan, Uzbekistan.
With strong experience in international logistics and export packaging, we ensure safe transportation, stable quality, and consistent technical performance across different climatic and environmental conditions.
Frequently Asked Questions – 12.7mm Unbonded PC Strand
What is an Unbonded PC Strand?
An unbonded PC strand is a prestressed steel strand coated with grease and protected by HDPE sheathing, allowing it to move freely within concrete while maintaining prestressing force.
What are the benefits of unbonded prestressed concrete?
It improves crack control, load distribution, durability, and construction flexibility while reducing overall construction cost.
What makes your unbonded PC strand better than others?
Our product features uniform coating, excellent friction performance, minimal impurities, and stable long-term prestressing efficiency.
Where is Unbonded PC Strand commonly used?
It is widely used in slabs, foundations, slopes, bridges, and industrial structures requiring unbonded prestressed concrete systems.
How should unbonded PC strands be stored?
Store in a dry, covered area, avoid sharp bending, and protect from dust or moisture before installation.
