Polymer Waterproof and Crack-Resistant Mortar
A dry‑powder protective material formulated by pre‑mixing cement and quartz sand as aggregates with redispersible latex powder, crack‑resistant fibers, water‑retaining agents, and waterproofing agents.
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Mortar type
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Polymer Waterproof and Crack-Resistant Mortar
A dry‑powder protective material formulated with cement and quartz sand as aggregates, combined with redispersible latex powder, crack‑resistant fibers, water‑retaining agents, and waterproofing agents, and prepared through pre‑mixing. It is used as the finish coat in thermal insulation systems to shield the insulation layer from external environmental factors—such as rain, ultraviolet radiation, and impact—while also preventing surface cracking, thus serving as the system’s “protective outer layer.”
Performance Metrics
1. Tensile bond strength (to insulation board): ≥0.1 MPa, with failure occurring within the insulation board (original strength); ≥0.08 MPa (water resistance); ≥0.08 MPa (freeze–thaw resistance).
2. Compressive strength: ≥6.0 MPa
3. Flexural strength: ≥3.0 MPa
4. Flexibility: Fold‑crush ratio ≤ 3.0
5. Crack Resistance: Under standard conditions, no cracks are observed at a plastering thickness of 3 mm.
6. Water permeability: ≤3 mL (24 h)
7. Freeze–thaw resistance: After 25 freeze–thaw cycles, no sanding, hollowing, or spalling occurs.
8. Drying shrinkage: ≤0.5 mm/m (after 28 days of drying)
Scope of Application
1. Surface protection of polystyrene board and extruded polystyrene board insulation systems.
2. Crack-resistant protection for rock wool board and composite insulation board thermal insulation systems.
3. Leveling the base layer of the integrated thermal insulation and decorative panel.
4. Surface-layer repair for thermal insulation retrofitting of existing buildings.
5. Surface protection of lightweight partition panels.
Product Advantages
1. Excellent crack resistance: Incorporation of crack‑resistant fibers and flexible polymers ensures a compressive‑to‑flexural strength ratio of ≤3.0, effectively preventing surface cracking.
2. Excellent protection: It offers superior waterproofing, impermeability, and UV resistance, safeguarding the insulation layer from external damage.
3. Strong adhesion: Exhibits high bonding strength with various insulation boards, eliminating the risk of hollowing or delamination.
4. Excellent compatibility: It exhibits strong adaptability to various decorative finishes, including exterior wall coatings, exterior wall tiles, and textured stone paints.
5. Convenient construction: Pre-mixed dry powder—simply add water and mix on site; applies smoothly and finishes easily.
Instructions for Use
1. Mortar preparation: Add clean water at a water-to-cement ratio of 1:0.25–0.3, mix thoroughly with an electric mixer, let stand for 5 minutes, then stir again. Use within 1 hour after mixing.
2. Layered Application: Apply in two layers. The first layer should be 2–3 mm thick; immediately after application, embed an alkali‑resistant fiberglass mesh (with an overlap of at least 100 mm and a minimum edge distance of 100 mm from the board edge). Once the first layer has dried to a whitish surface—approximately 24 hours—apply the second layer, 1–2 mm thick, for a total thickness of 3–5 mm.
3. Surface Treatment: During the application of the second coat, use a trowel to compact and finish the surface, ensuring smoothness; the flatness deviation shall not exceed 3 mm per 2 m.
4. Curing: After construction, apply water for curing for 3–5 days, watering 1–2 times daily, and avoid direct sunlight, strong winds, and rain.
5. Subsequent Construction: Coating, tile, and other decorative finish layers may be applied only after the skim coat mortar has fully dried (moisture content ≤ 10%, approximately 7 days).
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