Bulk Supply Js Waterproof Coating For Building Projects
Polymer‑Cement Waterproof Coating (JS)
Introduction & Application Scenarios for Three Types
Technical Indexes
| No. |
Test Item |
Type I |
Type II |
Type III |
| 1 |
Solid content /% ≥ |
70 |
70 |
70 |
| 2 |
Tensile strength, |
untreated /MPa ≥ |
1.2 |
1.8 |
1.8 |
| Retention after heat treatment /% ≥ |
80 |
80 |
80 |
| Retention after alkali treatment /% ≥ |
60 |
70 |
70 |
| Retention after water immersion /% ≥ |
60 |
70 |
70 |
| Retention after UV treatment /% ≥ |
80 |
— |
— |
| 3 |
Elongation at break, |
untreated /% ≥ |
200 |
80 |
30 |
| After heat treatment /% ≥ |
150 |
65 |
20 |
| After alkali treatment /% ≥ |
150 |
65 |
20 |
| After water immersion /% ≥ |
150 |
65 |
20 |
| After UV treatment /% ≥ |
150 |
— |
— |
| 4 |
Low-temperature flexibility (Φ10 mm bar) |
-10°C no cracks |
— |
— |
| 5 |
Bond strength, |
untreated /MPa ≥ |
0.5 |
0.7 |
1.0 |
| Damp substrate /MPa ≥ |
0.5 |
0.7 |
1.0 |
| Alkali treatment /MPa ≥ |
0.5 |
0.7 |
1.0 |
| Water immersion /MPa ≥ |
0.5 |
0.7 |
1.0 |
| 6 |
Impermeability (0.3 MPa, 30 min) |
Impermeable |
Impermeable |
Impermeable |
| 7 |
Impermeability (mortar backside) /MPa |
— |
0.6 |
0.8 |
Type I (High Flexibility)
Features: High polymer content, high elongation, excellent flexibility to accommodate substrate movement and micro‑cracks. Not suitable for permanent water‑immersed conditions. Application: Areas with large substrate deformation; non‑exposed roofs, basement side walls, non‑permanently‑immersed underground structures, tunnels, storage tunnels, terraces, lightweight partition walls, old roof renovation. Not recommended: Fish ponds, water tanks, bathroom floors and other permanently water‑soaked areas.
Type II (General‑Purpose, Balanced Flexibility & Strength)
Features: Well‑balanced flexibility and tensile strength, good water resistance, suitable for long‑term water immersion. Most widely used for residential and commercial projects. Application: Bathrooms, kitchens, balconies; landscape ponds, fish ponds, fire‑fighting reservoirs; basement floor slabs, positive‑water‑pressure surfaces, bay windows; wet‑dry alternating zones. Type II is preferred for most common waterproofing works.
Type III (High‑Adhesion Rigid Type)
Features: High cement content, superior bonding strength and impermeability, low elongation, rigid performance. Excellent performance for negative‑side waterproofing and moisture‑proofing. Application: Interior & exterior wall waterproofing and moisture‑proofing; basement negative‑water‑pressure sides; bathroom wall moisture‑proofing; ceiling damp‑proofing; walls requiring good tile adhesion. Mainly used for moisture‑proofing and negative‑side works; seldom used for permanently‑immersed floors.
Selection guide: Choose Type I for high‑movement substrates; Type II for water‑immersed areas, bathrooms and ponds; Type III for negative‑side waterproofing and wall damp‑proofing.
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