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This product is a waterproof coating made by reacting a special polyether with isocyanate to form a prepolymer, combined with various additives. It contains no cross-linking curing agent and cures to form a film solely by absorbing moisture from the air.
Products are classified into Type I, Type II, and Type III based on their basic performance;
Products are classified as exposed (E) or non-exposed (N) based on whether they are used in exposed conditions;
Products are classified into Category A and Category B based on the limits for hazardous substances.
Polyurethane Waterproof Coating—PU Waterproof Coating; Single-component—S; Exposed—E; Non-exposed—N.
Label in the following order: product name, components, basic performance characteristics, exposure status, limits for hazardous substances, and standard number.
Example: A Class I, Type I, open-surface, single-component polyurethane waterproof coating is labeled as:
PU Waterproof Coating S I E A GB/T 19250-2013
When applying the coating by scraping or brushing, it should be applied in multiple coats.
Substrate Preparation; Installation of Additional Waterproofing Layers in Detail Areas; Application of the Topcoat Waterproofing Membrane; Quality Inspection and Acceptance; Installation of Protective and Separation Layers
Substrate Preparation: The substrate must be flat, solid, and dry, free of defects such as sanding, cracks, or unevenness, and free of contaminants such as dust and oil stains.
Detailed Treatment: At joints such as inside and outside corners and pipe penetrations, first apply 1–2 coats of coating to create an additional waterproofing layer; round off the inside and outside corners.
Large-Area Application: The waterproof coating should generally be applied in 2–3 coats, with a total coating thickness of 1.5 mm to 2.0 mm. The first coat should be applied thinly to seal the pores in the substrate. Each coat must be allowed to cure thoroughly before applying the next; an interval of 24 hours is recommended, and the direction of application for each subsequent coat should be perpendicular to that of the previous one.
Finish Layer Application: For exterior walls, to enhance the adhesion between the finish layer (such as face tiles) and the coating film, the standard practice is to lightly sprinkle clean medium-grade sand over the surface of the coating film in a sparse pattern after applying the final coat, before it has cured. After the waterproofing layer has been completely dry for 48 hours, proceed with the installation of the finish layer in accordance with design requirements.
Widely used in waterproofing and seepage prevention projects for roofs, basements, bathrooms, as well as tunnels, roads, bridges, culverts, and reservoirs.
Applicable Standard: GB/T 19250-2013 “Polyurethane Waterproof Coatings”
| No. | Item | I | II | III | ||
| 1 | Solid content, % ≥ | 85.0 | ||||
| 2 | Surface drying time, h ≤ | 12 | ||||
| 3 | Actual work time, h ≤ | 24 | ||||
| 4 | Flowability | 20 minutes, no visible tooth marks | ||||
| 5 | Tensile strength, MPa ≥ | 2.00 | 6.00 | 12.00 | ||
| 6 | Elongation at break, % ≥ | 500 | 450 | 250 | ||
| 7 | Tear strength, N/mm ≥ | 15 | 30 | 40 | ||
| 8 | Low-Temperature Flexibility | -35°C, no cracks | ||||
| 9 | Impermeability | 0.3 MPa, 120 min—water-tight | ||||
| 10 | Heat Expansion Coefficient, % | -4.0 to +1.0 | ||||
| 11 | Bond strength, MPa ≥ | 1.0 | ||||
| 12 | Water absorption rate, % ≤ | 5.0 | ||||
| 13 | Aging at a Fixed Elongation | Heat Aging | No cracks or deformation | |||
| Artificial Climate Aging | No cracks or deformation | |||||
|
14 |
Heat Treatment (80°C, 168 h) |
Tensile Strength Retention, % | 80 to 150 | |||
| Elongation at break, % ≥ | 450 | 400 | 200 | |||
| Low-Temperature Flexibility | -30°C, no cracks | |||||
| Elongation at break, % ≥ | 450 | 400 | 200 | |||
| Low-Temperature Flexibility | -30°C, no cracks | |||||
Limits on Harmful Substances
| No. | Item | Category A | Category B |
| 1 | Volatile Organic Compounds (VOC), g/L ≤ | 50 | 200 |
| 2 | Benzene, mg/kg ≤ | 200 | |
| 3 | Toluene + Ethylbenzene + Xylene, g/kg ≤ | 1.0 | 5.0 |
| 4 | Phenol, mg/kg ≤ | 100 | 100 |
| 5 | Anthracene, mg/kg ≤ | 10 | 10 |
| 6 | Naphthalene, mg/kg ≤ | 200 | 200 |
| 7 | Free TDI, g/kg ≤ | 3 | 7 |
| 8 | Soluble heavy metals (lead), mg/kg ≤ | 90 | |
| 9 | Soluble heavy metals (cadmium), mg/kg ≤ | 75 | |
| 10 | Soluble heavy metals (chromium), mg/kg ≤ | 60 | |
| 11 | Soluble heavy metals (mercury), mg/kg ≤ | 60 | |
