1. Overview of the Two-component polyurethane membrane
This High Strength Polyurethane Waterproof Coating is developed specially for waterproofing use in railway bridge, concrete bridge deck either ballasted or ballast less. This coating is a high polymer waterproofing material of high strength, high elasticity and high adhesion strength properties. The material has two subclasses, with the 3.5Mpa type as a coiled material adhesive and the 6.0Mpa type as a waterproof layer directly and independently.
2. Specification of the Two-component polyurethane membrane
6.0Mpa type: 40kg/set, mixing ratio 1:1
3.0Mpa type: 60kg/set, mixing ratio 1:1
3. What about the product
Tensile strength is high, from 3.5Mpa to 6.0Mpa.
Adaptability to temperature change is great; resistance to alkali and acid is excellent.
Adhesive ability is super, 2.5Mpa on dry concrete and 0.6Mpa on moisture substrate. Construction is suitable in moisture circumstances.
A thick coating gives a dense, pinhole-free and bubble-free layer.
Resistance to long-term water erosion, corrosion, mould is excellent.
Wear resistance, shock resistance, fatigue resistance are great. Elongation and adaptability to crack is excellent.
The material use high boiling point solvent and is eco-friendly.
4. Where to use
Waterproof project in railway (passenger line) bridge, concrete bridge deck with or without ballast.
Waterproof project in highway concrete bridge, bridge deck and water conservancy dams.
5. How to use
Application surface need to be solid, flat, free of water, oil and dust. Suitable environment temperature is 0℃~40℃.
Mix component A and component B, stir thoroughly the mixture (the mixture shall be used up within 30min, avoiding solidifying before application), use a soft scraper to coat it onto application surface. It is recommended to do it in 2 to 3 separate passes. Mechanical spraying does a better job here, by spraying 1~2 separate passes (extra solvent may be needed if apply by means of spraying). Do the next pass only after the previous pass is fully dry and normally a 24 hour interval is needed.
A moderate amount of sand can be placed on top of the last pass of coating before surface dry, to strengthen its bonding ability with the following protective layer.
Before the coating is hard dry, prohibit walking or piling sundries on the top to avoid any damage.
Recommend amount: 1.5mm thickness consumes 1.9kg/㎡ to 2.1 kg/㎡; 2.0mm thickness consumes 2.6kg/㎡ to 2.8 kg/㎡.
6. Executive standard
|Executive standard: TB/T2965-2011 Concrete Bridge Deck Waterproof Layer Technical Conditions|
Two-component polyurethane membrane
Tensile Strength /Mpa ≥
Surface Dry /h ≤
Hard Dry /h ≤
Solid Content /% ≥
Low Temp Bending
Adhesive Strength to moisture substrate /Mpa ≥
Adhesive Strength to concrete /Mpa ≥
Tear Strength /（N/mm） ≥
Peel Strength on concrete /（N/mm） ≥
Use up the material within 30min once component A and component B is mixed, unmixed material must be protected from contamination.
Application environment temperature shall be above 5℃, keep the site ventilated.
Before the applied coating gets hard dry, protect it from being damaged.
After a long storage, a thin skin may form on top of material, get rid of it before application. This dose not affects material property.
8. How to store
In transportation and storage, products of different types and different specifications shall be sorted and stored separately. Products must be away from insolation, rain and fire. Avoid product collision; keep good ventilation of the place and storage temp below 40℃.
Under proper storage and transportation, product shelf life is 12 months.