Polymer-bonded mortar
A dry‑powder adhesive material prepared by pre‑mixing cement and quartz sand as aggregates, with the addition of a polymer (redispersible latex powder), a water‑retaining agent, and a thixotropic agent.
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Mortar type
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Polymer-bonded mortar
A dry‑mix adhesive formulated with cement and quartz sand as aggregates, combined with a polymer (redispersible latex powder), water‑retaining agent, and thixotropic agent, and pre‑mixed in advance. It is specifically designed for bonding insulation boards—such as polystyrene boards, extruded polystyrene boards, and rock wool boards—to the substrate wall, addressing the issues of insufficient bond strength and susceptibility to delamination inherent in conventional cement mortars.
Performance Metrics
1. Tensile bond strength (to a cement mortar substrate): ≥0.6 MPa (original strength), ≥0.4 MPa (water resistance), ≥0.4 MPa (freeze–thaw resistance).
2. Tensile bond strength (with polystyrene board): ≥0.1 MPa, with failure occurring within the polystyrene board (original strength).
3. Compressive strength: ≥6.0 MPa
4. Flexural strength: ≥3.0 MPa
5. Water retention rate: ≥90% (2 h)
6. Open time: 1.5–4 hours (25°C)
7. Setting Time: Initial setting ≥ 4 h, final setting ≤ 24 h
8. Freeze–thaw resistance: After 25 freeze–thaw cycles, the bond strength retention rate is ≥80%.
Scope of Application
Used for bonding the insulation layer.
Product Advantages
1. Strong adhesion: Exhibits high bonding strength with various substrates and insulation boards, meeting national standard requirements.
2. Excellent water retention: Water retention rate ≥ 90%, ensuring complete hydration of the cement and preventing rapid moisture loss that could reduce bond strength.
3. Excellent flexibility: The addition of polymeric compounds imparts a degree of flexibility, enabling it to accommodate thermal expansion and contraction between the substrate and the insulation board.
4. Excellent workability: good thixotropy, smooth application, no sagging, and a moderate open time (1.5–4 hours), facilitating adjustments.
5. Excellent durability: resistant to water, freeze–thaw cycles, and aging; exhibits long-term stable adhesion performance, with a service life of ≥25 years.
Instructions for Use
1. Substrate Preparation: The substrate must be smooth (deviation ≤ 5 mm/2 m), clean, and dry (moisture content ≤ 8%), with no oil stains or loose dust.
2. 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, and then use (use within 1.5 hours after mixing).
3. Mortar Application: Apply mortar to the back of the insulation board; for polystyrene boards, use the spot-bonding method (bonding dots with a diameter of 100–150 mm); for extruded polystyrene boards and rock wool boards, use either full-bonding or strip-bonding methods.
4. Panel Installation: Apply mortar to the insulation board and affix it to the substrate, pressing gently to ensure tight contact between the mortar and the substrate. Adjust the panel’s position to achieve uniform joint spacing.
5. Drying Time: After application, allow the adhesive to dry for 24 hours; proceed with anchoring or subsequent construction only after the mortar has reached initial set.
6. Construction temperature: 5°C–35°C. Construction is prohibited in rainy conditions or during strong winds (wind force ≥ Level 5). In winter, appropriate antifreeze measures must be implemented.
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