NWT313 Polyurethane Waterproof Coating for High-Speed Rail

This product is a polyurethane waterproof coating specifically designed for high-speed rail, consisting of Components A and B. Component A is a polyurethane prepolymer, and Component B is a curing agent. To use, mix Components A and B in a specific ratio, stirred thoroughly, and then applied to the substrate. After several hours, the mixture reacts and cures to form a continuous, flexible, and seamless rubber waterproofing layer.

Product Categories

Based on their intended use, polyurethane waterproofing coatings are classified into those used directly as a waterproofing layer and those used to adhere waterproofing membranes.

Code Marker

Polyurethane waterproofing coatings intended for direct use as a waterproofing layer are labeled as:

PU Waterproof Coating 6.0 MPa

Product Features

• Environmental Protection: Uses high-boiling-point solvents; contains no toxic benzene-based solvents or coal tar components;
• High strength, good elasticity, and strong adhesion; the material exhibits excellent physical properties at both high and low temperatures;
• Cold application; forms a dense film; safe and convenient to apply; can be applied by spraying or troweling;
• High shear resistance; capable of withstanding dynamic loads and horizontal shear forces even at temperatures ranging from -50°C to +160°C;
• Resistant to acids and alkalis, corrosion-resistant, and highly impermeable, it extends the service life of bridges.

Construction Methods

When applying the coating by spraying or troweling, apply it in multiple coats.

• Substrate Preparation: The substrate must be stable, sturdy, level, and free of sharp edges. Ensure proper waterproofing details are addressed at all joints.
• Ingredient Ratios: Ingredients must be mixed strictly according to the specified ratios. Accurate measurement is required; the weighing error for each component must be within ±2%. After weighing accurately, pour the ingredients into the mixing bucket and mix thoroughly with an electric mixer for 3 to 5 minutes. Each batch must be used within 20 minutes; mix as needed and use immediately.
• Application Guidelines: Apply evenly using a rubber or plastic squeegee to ensure a uniform thickness; The total film thickness should not be less than 2.0 mm, with a consumption of no less than 2.4 kg per square meter. Application should be performed in two coats; the second coat should not be applied until the first coat has cured and formed a film. Each coat should be applied in directions perpendicular to the previous one.

Applications

Suitable for corrosion protection, seepage prevention, and waterproofing projects in railways, highways, bridges, high-speed railways, and other similar applications.

Suitable for special anti-corrosion, moisture-proof, and waterproof projects in various defense projects, nuclear power plants, shipyards, and other similar facilities.

It is particularly suitable for waterproofing and moisture-proofing projects outside the ballast troughs on ballasted bridge decks and outside the guardrails on ballastless bridge decks.

Packaging, Storage, and Transportation

• Packaging

The product is packaged in sealed metal or plastic drums with lids. Multi-component products are packaged separately by component, and the packaging for different components must be clearly distinguishable.

• Transportation and Storage

During transportation and storage, products of different types and specifications should be stacked separately and should not be mixed. Protect from direct sunlight and rain, keep away from sources of fire, prevent impact, and ensure adequate ventilation. The storage temperature should not exceed 40°C.

Under normal storage and shipping conditions, the shelf life is 12 months from the date of manufacture.

Performance Metrics

Applicable Standard: TB/T 2965-2018 "Waterproofing Layers for Concrete Bridge Decks on Railway Bridges"