Qicai Bangyuan

Characteristics and Key Construction Points of Polymer-Bonded Mortar

Release time:

2023-05-22 17:10

Many customers do not fully understand the characteristics and key construction considerations of polymer‑bonded mortar. In this issue, a polymer‑bonded mortar manufacturer from Shandong will share with you the distinctive features of our product.

Polymer-bonded mortar

 

I. Product Introduction:

 

Polymer‑bonded mortar is a polymer‑reinforced, cement‑based, pre‑blended dry‑mix flexible adhesive mortar. It is formulated by uniformly blending cement, quartz sand, and dispersible polymer powder imported from Germany, along with various additives. Compared with mortars containing conventional construction adhesives, it exhibits superior flexibility and bonding performance, as well as excellent sag resistance, water retention, and water resistance, while offering simple and convenient workability. It enhances the bond strength between the substrate and insulation boards, improves tensile strength, and helps prevent delamination. Simply add water for easy application; it is straightforward to handle and delivers high productivity.

 

II. Product Applications:

 

It is suitable for bonding EPS polystyrene insulation boards, XPS extruded polystyrene boards, and substrates such as concrete, brick masonry, and aerated concrete blocks in both exterior wall external insulation systems and interior wall internal insulation systems. It is also applicable to adhering facing tiles to insulation walls with high shrinkage rates, as well as to bonding thin marble slabs and gypsum boards with relatively smooth surfaces.

 

III. Recommended Dosage:

 

3–5 kg/m²

 

IV. Key Construction Points:

 

1. Substrate Preparation: The surface must be smooth, solid, clean, and dry. Concrete residues, release agents, and curing compounds on the wall must be thoroughly removed. Any areas with excessive unevenness should be chiseled or repaired, and loose material must be scraped away. Newly plastered substrates must be allowed to harden and dry completely before proceeding with application.

 

2. Preparation of bonding mortar: Add water to polymer‑modified bonding mortar at a weight ratio of 4:1 (water to mortar). Use an electric mixer to blend thoroughly, then let the mixture stand for 5–10 minutes before stirring again. The mixed mortar should be used within 2 hours; do not reuse mortar that has already begun to set.

 

3. Adhering polystyrene boards or extruded polystyrene boards: When using the spot‑and‑frame bonding method, the bond area shall be no less than 30% for exterior paint finishes and no less than 50% for exterior tile finishes.

 

(1) Strip‑adhesion method: First, use a notched trowel to evenly spread the mixed adhesive mortar onto the polystyrene or extruded polystyrene board. Then, use a notched trowel to comb the mortar into strip‑shaped ridges. Attach the insulation board to the wall surface, gently and evenly pressing it to ensure firm adhesion, and continuously check for flatness and verticality with a 2‑m straightedge. When bonding the boards, be sure to remove any mortar that has oozed out from the edges, ensuring there is no joint mortar between adjacent boards.

 

(2) Edge‑spot method: Use a trowel to evenly apply the mixed adhesive mortar along the edges of the insulation board to form a border, then distribute six or eight adhesive spots—raised above the border—uniformly across the board’s surface. Finally, adhere the polystyrene or extruded polystyrene board to the wall using the aforementioned method and level it with a straightedge.

 

(3) When the design specifies mechanical anchors for fixing polystyrene or extruded polystyrene boards, anchor installation shall be carried out no earlier than three days after the adhesive mortar has been applied.

 

4. Precautions: The ambient temperature during application must be above 5°C; unauthorized addition of sand, cement, or other admixtures is strictly prohibited; below 0°C, an antifreeze‑compatible formulation should be used (to ensure the overall system’s stability, winter application is not recommended); mixed mortar must be used within 2 hours, and any mortar that has already set and hardened must not be reused; storage and transportation should be protected from moisture and rain.

 

Shandong Bangyuan New Building Materials Co., Ltd. is located at No. 17 Kunming Road, Linyi Economic Development Zone. It is a comprehensive enterprise integrating research, development, production, and sales of building materials. The company operates modern production facilities within China and maintains numerous stable engineering partnerships. Leveraging state-of-the-art manufacturing equipment and a highly skilled R&D team, it continuously develops a wide range of high‑quality, environmentally friendly new building materials. Its main products include molded polystyrene boards, graphite‑enhanced polystyrene boards, lost‑foam molds, polymer‑based bonding mortars, polymer‑modified skim coats, adhesive‑powder particle slurries, lightweight machine‑sprayed gypsum plasters, alkali‑resistant mesh fabrics, and other innovative building materials. Shandong Bangyuan Decoration Engineering Co., Ltd. is a specialized engineering firm focused on the research, development, and installation of various exterior wall insulation systems.

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Characteristics and Key Construction Points of Polymer-Bonded Mortar

Many customers do not fully understand the characteristics and key construction considerations of polymer‑bonded mortar. In this issue, a polymer‑bonded mortar manufacturer from Shandong will share with you the distinctive features of our products.

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