Coba CTA120 Powder Adhesive - Frost & Moisture Resistant 25kg

Processing Coba CTA120 Surface preparation

The substrate must be clean, dry, load-bearing, crack-free, stable, and free of any substances that could adversely affect adhesion. Always prime highly absorbent substrates with Coba DPM800 primer. Smooth and non-absorbent substrates, such as existing tile work (indoors only), must be degreased with Coba ASP990 tile cleaner and primed with Coba DPM810 primer. Wooden floors must be sufficiently rigid with a screwed construction of waterproof plywood (at least 15 mm thick).

Processing

Add 25kg of coba CTA120 to approximately 6.5 (for 5kg, approximately 1.3) liters of clean tap water. Use a clean, dry mortar container. Mix for 1 minute with a mortar mixer until a homogeneous, lump-free mixture is obtained. Mix again after a few minutes. The tile adhesive is then ready for use.

Apply Coba CTA120 with a suitable notched trowel. Choose a notch that ensures at least 80% contact surface between the back of the tile and the adhesive. For outdoor applications, heavy-duty (floor) tiling, thin tiles, or large-format porcelain tiles (> 40x40 cm), a 100% contact surface is required. In these cases, the tiles should be adhered to the substrate using the buttering/floating method. Press the tiles into the adhesive with a sliding motion for optimal initial adhesion. Avoid exceeding the open time.

If in doubt, always test a piece or contact our technical advice department.

• Process prepared adhesive within 120 minutes.
• Processing temperature between 5°C and 25°C.
• Clean tools immediately after use with (warm) water.

Post-treatment/drying

The setting time of the adhesive depends on the ambient conditions, such as temperature, moisture, substrate, and type of tile. The tiles can be walked on after 24-48 hours. After curing, grout with a Coba grout sealant.