In the demanding world of civil engineering and infrastructure maintenance, the integrity of expansion joints in concrete pavements is non-negotiable. Whether it is an international airport runway, a high-speed highway, or a heavy-duty industrial warehouse floor, the choice of sealant can mean the difference between long-term durability and costly, frequent repairs. SV313 20KG Polyurethane Expansion Joint Self-Leveling PU Sealant stands at the forefront of this industry, offering a professional-grade solution engineered for the most challenging environments.
The Critical Role of Expansion Joint Sealants in Modern Infrastructure
Expansion joints are designed to absorb the natural thermal expansion and contraction of concrete slabs. Without an effective sealant, these joints become entry points for water, debris, and chemicals, leading to sub-base erosion, "pumping" of the slabs, and eventual structural failure. In aviation environments, the stakes are even higher: loose debris from failing joints (FOD - Foreign Object Debris) poses a catastrophic risk to jet engines.
Understanding Buyer Pain Points and Solutions
B2B procurement managers and project engineers often face a recurring set of challenges when selecting sealants for large-scale projects:
| Common Pain Points | The SV313 Solution |
| Frequent Maintenance | SV313 offers high weathering resistance and durability, significantly extending the maintenance cycle of runways and pavements. |
| Bubbling and Adhesion Failure | Formulated as a moisture-cured, one-component system, SV313 ensures excellent adhesion to concrete without the common bubbling issues found in low-quality PU sealants. |
| Heavy Traffic Wear | With a Shore A hardness of ≥15 and a resilience rate of 70%, SV313 withstands the vertical and horizontal loads of aircraft and heavy machinery. |
| Chemical Exposure | Engineered to resist fuels, oils, and de-icing chemicals, making it ideal for petrol stations and airport taxiways. |
| Complex Installation | The self-leveling property eliminates the need for manual tooling, reducing labor costs and ensuring a professional, smooth finish. |
Why Choose Siway: A Legacy of Excellence in Sealant Technology
Choosing a supplier is as important as choosing the product. Shanghai Siway Building Material Co., Ltd. is recognized as a Top 10 silicone and PU sealant manufacturer in China. Our commitment to quality is backed by international certifications and a robust R&D infrastructure.
1.Direct Factory Advantage: As a direct manufacturer, we eliminate middleman costs, providing competitive pricing for bulk B2B orders without compromising on material quality.
2.Global Certification: Our production facilities are ISO 9001 and ISO 14001 certified, ensuring that every batch of SV313 meets stringent international quality and environmental standards.
3.OEM & ODM Capabilities: We understand that different regions and projects have unique requirements. We offer full private label support, customized colors (Grey/Black), and tailored formulations to meet specific climatic conditions.
4.Technical Support: From project estimation to on-site construction guidance, our technical department provides end-to-end support for our clients.
SV313: Professional Product Insights and Industry Knowledge
The SV313 is a one-component, moisture-cured polyurethane sealant specifically designed for horizontal joints. Unlike multi-component systems that require precise on-site mixing (and are prone to human error), SV313 is ready-to-use straight from the 20KG drum or 600ml sausage.
Technical Specifications and Performance Data
The superiority of SV313 is reflected in its physical properties, which align with ASTM D5893 standards for cold-applied, single-component, chemically curing silicone joint sealants for concrete pavements, while offering the unique mechanical advantages of polyurethane.
| Property | Value / Specification | Benefit |
| Appearance | Grey/Black Self-leveling Liquid | Ensures a seamless,professional aesthetic finish. |
| Density (g/cm3) | 1.35 ± 0.1 | High-density formulation for superior durability. |
| Tack-Free Time (Hr) | ≤ 5 | Fast-track projects can return to service quicker. |
| Elongation at Break (%) | ≥ 800 | Exceptional flexibility to handle extreme joint movement. |
| Resilience Rate (%) | 70 | Quickly recovers its shape after being compressed or stretched. |
| Service Temperature | -40°C to +80°C | Performs reliably in both arctic and tropical climates. |
| Solid Content (%) | ≥ 95 | Minimal shrinkage after curing ensures joint integrity. |
"The high elongation at break (≥800%) of SV313 is a game-changer for airport runways, where thermal movement and heavy landing loads create intense stress on concrete joints." — Siway Technical Department
Competitive Analysis: SV313 vs. Ordinary Market Products
When comparing SV313 to standard "off-the-shelf" polyurethane sealants, the differences in long-term performance are stark.
1. Adhesion and Primer-less Application
Ordinary PU sealants often require a primer to bond effectively with concrete, increasing material costs and labor time. SV313 is engineered for excellent adhesion to cleaned concrete surfaces, even in submerged conditions like canals or reservoirs.
2. Weathering and UV Resistance
Standard PU sealants are notorious for "chalking" or cracking under intense UV exposure. SV313 incorporates advanced UV stabilizers, ensuring it remains elastic and crack-free even after years of exposure to direct sunlight on open runways.
3. Self-Leveling Performance
Many "self-leveling" products on the market are too viscous, leaving uneven surfaces that trap debris. SV313 features a optimized flow rate that ensures it penetrates deep into the joint and levels out perfectly, creating a "flush" finish that is safe for aircraft tires.
Professional Construction Guidance for SV313
To achieve the best results, proper application is critical. Follow these professional steps for airport runway and highway joint sealing:
1.Joint Preparation: The joint must be clean, dry, and free from dust, oil, or old sealant. Use high-pressure air or mechanical brushing if necessary.
2.Backer Rod Installation: Insert a closed-cell polyethylene backer rod to the required depth. This controls the sealant depth and prevents three-sided adhesion, allowing the sealant to stretch properly.
3.Application:
• For 600ml sausages, use a manual or pneumatic caulking gun.
4.Self-Leveling: Allow the product to flow naturally. No tooling is required for horizontal surfaces.
5.Curing: Protect the joint from traffic and moisture for at least 5 hours (tack-free time). Full cure occurs at a rate of 3-5mm per 24 hours.
Real-World Application Cases
Case Study 1: International Airport Runway Rehabilitation
A major international airport in Southeast Asia faced significant joint failure due to high humidity and heavy aircraft traffic. By switching to SV313, the airport reduced its joint maintenance frequency by 40% over a three-year period. The self-
Case Study 2: Industrial Logistics Hub
A 50,000 sqm warehouse floor required a sealant that could withstand constant forklift traffic and chemical spills. SV313 provided a smooth, durable finish that protected the slab edges from "spalling" (chipping), ensuring a safe and efficient environment for automated guided vehicles (AGVs).
Ninoy Aquino International Airport, Manila, Philippines
OEM Services and B2B Partnership
At Siway, we go beyond being a supplier; we are your strategic partner. Our OEM/ODM services are designed to help distributors and large contractors build their own brands.
• Customized Packaging: From 300ml cartridges to 200L drums, we provide packaging that fits your market.
• Brand Integration: We can print your logo and technical data directly on the packaging.
• Tailored Formulations: Need a faster cure for cold climates or higher chemical resistance for industrial plants? Our lab can adjust the formula to your needs.
Elevate Your Infrastructure with SV313
The SV313 Polyurethane Self-Leveling Sealant is more than just a joint filler; it is a high-performance engineering component that protects your most valuable infrastructure assets. With its unmatched elasticity, chemical resistance, and ease of application, it represents the pinnacle of modern sealant technology.
Take the Next Step
Are you looking for a reliable, factory-direct supplier for your next infrastructure project?
• View Product Details: SV313 Product Page
• Request a Quote: Inquiry Form
• Explore More Solutions: Siway Full Product Catalog
Contact us today at +86 21 37682288 or visit our headquarters in Shanghai to discuss your specific project needs.
Q: Can SV313 be used on vertical joints?
A: No, SV313 is a self-leveling (liquid) sealant designed specifically for horizontal joints. For vertical applications, please inquire about our non-sag polyurethane sealants.
Q: Is a primer required for concrete application?
A: In most cases, SV313 offers excellent adhesion without a primer. However, for submerged conditions or highly porous substrates, we recommend a site-specific adhesion test or consulting our technical team.
Q: What is the shelf life of the product?
A: The shelf life is 9 months when stored in original, unopened packaging in a cool, dry place (5°C to 25°C).
Q: Do you provide samples for testing?
A: Yes, we provide samples for professional testing and project approval. Please Contact Our Sales Team to arrange a shipment.
Post time: Jul-03-2026