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Sustainability is not just our goal—it’s our responsibility.
At SIW, we are committed to leading the steel industry toward a cleaner, smarter future. From reducing carbon emissions and ensuring zero wastewater discharge to integrating AI-driven efficiency and nurturing our team’s growth, every step we take is driven by a clear mission:
Achieve Net Zero by 2050.
Hear from our Managing Director, Chandrasekaran Srivatsan, on how we’re building a more sustainable tomorrow.
hashtagSustainability hashtagNetZero2050 hashtagGreenSteel hashtagAIforSustainability hashtagSIW hashtagEPD
06-06-2025
How Is PC Wire Used Differently in Post-Tension vs Pre-Tension Systems?PC Wire (Prestressed Concrete Wire) is a crucial material used to strengthen prestressed concrete. It is commonly applied in two major systems: Pre-tension and Post-tension. While they use similar materials, the method of application and the advantages of each system are distinctly different. Let’s explore the differences🔹 Pre-Tension (Before Concrete Pouring)In this system, PC Wire is tensioned before the concrete is poured into the mold. Once the wire is stretched to the required force, concrete is poured over it. After the concrete sets and gains strength, the tension is released, and the wire tries to return to its original state, which compresses the concrete.Ideal for: Factory-made precast elements such as floor planks, hollow-core slabs, and concrete beamsAdvantages: Quality can be easily controlled in a factory settingLimitations: Requires large formwork and transportation of finished components to the site🔹Post-Tension (After Concrete Pouring)In this method, ducts or sheaths are placed inside the formwork before concrete pouring. Once the concrete is cured, PC Wire is threaded through the ducts, then tensioned and anchored at both ends. Finally, the ducts are filled with grout to protect the steel and bond it to the concrete.Ideal for: Large-scale projects such as high-rise buildings, bridges, and flat slab systemsAdvantages: More design flexibility, thinner structural elements, material efficiencyLimitations: Requires skilled labor and strict on-site quality control*Both systems have unique strengths and trade-offs. Choosing the right one depends on project type, budget, and engineering requirements.At SIW, we manufacture high-quality PC Wire for prestressed concrete applications in both pre-tension and post-tension systems. Our products are certified with TIS standards and trusted in over 70 countries worldwide.hashtag#SIW hashtag#PCwire hashtag#posttension hashtag#pretension
29-04-2025
Another project that uses SIW's prestressed steel wire (PC Strand) is the Motorway M6 in Thailand.hashtag#SIW ’s prestressed steel wire (PC Strand) is used in major projects around the world, certified by many certificates with sales in over 70 countries. It is also an environmentally conscious product, made from raw wire materials primarily composed of recycled materials.hashtag#expressway hashtag#motorway
25-06-2025
What are the applications of 7-wire PC Strand?1. LNG Tank – Liquefied Natural Gas Storage Tank2. Wind Tower – Wind Turbine Tower3. Nuclear Reactor Tank – Nuclear Reactor Containment Tank4. Bonded Post Tension Bridge – Bonded Post-Tensioning Bridge System5. Beam & Column – Beams and Columns6. Bridge Girder – Bridge Girders7. Plank Girder – Precast Floor Girders8. Concrete Pile – Concrete Piles9. Hollow Core Plank – Hollow Core Slabs10. Cement Silo – Cement Storage Silo11. Precast Segmentation Box – Precast Concrete Segment Box12. Water Treatment Tank – Water Treatment TankSIW's PC Strand has been tested and certified to meet global quality standards and certifications with sales in over 70 countries worldwide. Additionally, the product is environmentally conscious, using raw steel wire with a significant proportion of recycled materials.Diameter: 7.9 - 18 mmStandards: TIS 420-1997, AS/NZS 4672-2007, ASTM A416-2016, ASTM A416-2017, ASTM A886-2012, BS 5896-2012, prEN 10138-2012, JIS G 3536-2014, LNEC E 453-2020, XPA35-04503, MS 1138-4-2007, SNI 1154-2011, TSE 5680-1998, IS 14268-1995, GB/T 5224-2014, NBR 7483, UNE 36094-1997, SFS 1265-3, SS 212553-2013, NEN 3868, NBN I 10-003, UNI 7676-2016Contact us:Email: marketing@siw.co.thTel: (+66) 81-170-2571 hashtag#PCStrand
07-08-2023
Surface corrosion and pitting corrosion differ in the following ways: Surface Corrosion: Surface corrosion refers to the corrosion that occurs on the surface of a metal, where the metal surface is not deeply eroded or penetrated by corrosion to the extent that it becomes pitted or significantly damaged. Pitting Corrosion: Pitting corrosion is corrosion that develops on the metal surface over an extended period, causing the metal surface to be deeply eroded and penetrated into the metal substrate. This leads to significant damage to the metal, rendering it unsuitable for use. Corrosion Mechanism:When a metal undergoes oxidation or is subjected to reduction, the corrosion process takes place, resulting in the erosion of the metal. Therefore, the primary goal of corrosion prevention is to inhibit the occurrence of oxidation reactions. The most resistant metals to corrosion are those with the highest positive electrode potentials, such as gold. Platinum, silver, and red gold also possess good resistance to corrosion due to their relatively high positive electrode potentials. On the other hand, other metals are more susceptible to oxidation, meaning they are more likely to corrode easily. An example of a commonly encountered and distinct corrosion process is the formation of rust on iron or the creation of iron oxide. Iron corrodes when there is the presence of oxygen and water. The corrosion process of iron is relatively complex and has unique characteristics. However, it is believed to involve critical steps, including: 1. Oxidation reaction occurs at a specific area on the iron surface, acting as the anode. This can be represented by the equation: Fe(s) Fe2+(aq) + 2e-2. Oxygen is reduced at another area of the iron surface, acting as the cathode. In the presence of water, the equation becomes: 2O2(g) + 4H2O(l) + 8e- 8OH-(aq)3. A subsequent reaction involves the formation of iron hydroxide: 4Fe2+(aq) + 8OH-(aq) 4Fe(OH)2(aq) These steps contribute to the formation of iron oxide, commonly known as rust, and the overall corrosion process of iron. It's important to note that the corrosion mechanisms and reactions can vary based on the specific metal, environment, and conditions involved.
06-05-2025
SIW-Testing Service Center for Prestressed Steel Wire Quality TestingPerfect for manufacturers or users of PC Wire and PC Strand who require quality test results according to various standards. With over 30 years of expertise, SIW’s lab specializes in prestressed steel wire quality testing.Convenient, Fast, and Cost-effectiveISO/IEC 17025 certified by NATA (National Association of Testing Authorities, Australia)Detailed, Clear, and Traceable Reports at Every Step, with Analysis and Improvement SuggestionsModern Equipment with High Efficiency and Precision of Over 99.95%Flexible Testing Customization Based on Client Requirements, Including Specific TestsService Information:1. Fatigue Testing MachineBrand: Zwick Roell, Model: HA500Testing Standards Supported: AS/NZS 4672.1, AS/NZS 4672.2, BS 5896, LNEC E 542, LNEC E 453, ISO 15630 Part 3, TIS 95-2540, TIS 420-2540PC Wire: Maximum Load 500 kN, Sample Diameter 5 – 22 mmPC Strand: Maximum Load 500 kN, Sample Diameter 5 – 22 mmDeformed Bar: Maximum Load 500 kN, Sample Diameter 5 – 40 mm2. Relaxation Testing MachineTesting Standards Supported: AS/NZS 4672.1, AS/NZS 4672.2, ASTM A416/A416M, ASTM A421/A421M, ASTM A881, BS 5896, ISO 15630-3, JIS G3536, TIS 95-2540, TIS 420-2540PC Wire: Maximum Load 300 kN, Sample Diameter 4 – 9 mmPC Strand: Maximum Load 500 kN, Sample Diameter 9.3 – 18.0 mm
16-08-2024
Now Open!! SIW-Testing Service Center for Prestressed Steel Wire Quality Testing Perfect for manufacturers or users of PC Wire and PC Strand who require quality test results according to various standards. With over 30 years of expertise, SIW’s lab specializes in prestressed steel wire quality testing. Convenient, Fast, and Cost-effective ISO/IEC 17025 certified by NATA (National Association of Testing Authorities, Australia) Detailed, Clear, and Traceable Reports at Every Step, with Analysis and Improvement Suggestions Modern Equipment with High Efficiency and Precision of Over 99.95% Flexible Testing Customization Based on Client Requirements, Including Specific Tests Service Information: 1. Fatigue Testing Machine Brand: Zwick Roell, Model: HA500 Testing Standards Supported: AS/NZS 4672.1, AS/NZS 4672.2, BS 5896, LNEC E 542, LNEC E 453, ISO 15630 Part 3, TIS 95-2540, TIS 420-2540 PC Wire: Maximum Load 500 kN, Sample Diameter 5 – 22 mm PC Strand: Maximum Load 500 kN, Sample Diameter 5 – 22 mm Deformed Bar: Maximum Load 500 kN, Sample Diameter 5 – 40 mm 2. Relaxation Testing Machine Testing Standards Supported: AS/NZS 4672.1, AS/NZS 4672.2, ASTM A416/A416M, ASTM A421/A421M, ASTM A881, BS 5896, ISO 15630-3, JIS G3536, TIS 95-2540, TIS 420-2540 PC Wire: Maximum Load 300 kN, Sample Diameter 4 – 9 mm PC Strand: Maximum Load 500 kN, Sample Diameter 9.3 – 18.0 mm Service fees for wire testing by the Testing Service Center Why Choose SIW - Testing Service Center Contact Us: >>Click<<
01-07-2025
What is "Fatigue"?Why Must Strong Structures Pass This Test?In engineering, a material being strong doesn’t always mean it’s durable.What’s more challenging than tensile strength is repeated loading, also known as Fatigue.What is Fatigue?Fatigue is the weakening of a material caused by repeated loading and unloading.For example, steel wires used in prestressed concrete, piles, or bridges may not break from a single force.But after tens or hundreds of thousands of repeated stresses, the material becomes "fatigued" — and can fail without warning.Examples of Fatigue-Related Failures:Bridge cables snapping after just a few years of useStructural collapse due to continuous vibrationsDamage invisible to the naked eyeWhy Perform Fatigue Testing at SIW-Testing Service Center?1. Internationally Certified StandardsSIW operates the only wire testing lab in Thailand certified for Fatigue Testing by NATA (Australia’s national lab accreditation body).This guarantees that all equipment and processes meet strict international standards.2. Real Testing — Beyond TheoryWe simulate repeated stress cycles to determine how many times your wire can withstand force before failure.You’ll receive detailed reports with clear graphs, backed by advanced tools and expert analysis.3. Supporting Nation-Level ConstructionSIW supports major infrastructure projects—expressways, bridges, rail systems—where high-performance wire is critical.Fatigue testing is a key step before the wire is ever used in the field.
08-06-2022
ลักษณะการขนส่งที่ดีควรเป็นอย่างไร นอกจากสินค้าที่ดี มีคุณภาพแล้ว การจัดส่งสินค้าก็มีความสำคัญไม่แพ้กัน เนื่องจากความต้องการของลูกค้าเป็นสิ่งสำคัญที่จำเป็นต้องส่งสินค้า ให้ได้ตรงตามความต้องการของลูกค้า รวมถึงการคลุมผ้าใบเพื่อป้องกัน สินค้าไม่ให้โดนฝน และให้สินค้าถึงมือผู้ซื้ออย่าปลอดภัย ลักษณะของการขนส่งที่ดี 1. มีความรวดเร็วและตรงต่อเวลา 2. ส่งสินถ้าถึงที่หมายอย่างปลอดภัย 3. มีการป้องกันการสูญเสียที่จะเกิดขึ้น 4. การแต่งกายของคนขับที่ถูกต้อง และมีความสุภาพเรียบร้อย มาดูกันครับว่าการแต่งการให้ถูกต้องในการจัดส่งของ ของ บริษัทสยามลวดเป็นอย่างไร การแต่งตัวของคนขับรถส่งสินค้า - สวมแว่นตานิรภัย - หมวกนิรภัยและคาดสายรัดคาง - ติดบัตรที่บริษัทออกให้ ตลอดเวลาที่อยู่ในพื้นที่ - สวมเสื้อสะท้อนแสง - สวมใส่รองเท้านิรภัยที่สภาพพร้อมใช้งาน
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