CERESIT CM 77 UltraFLEX

Features and Benefits

Ready to use tile adhesive with high flexibility to be used also on slightly vibrating surfaces

Properties

  • Long-lasting, strong adhesion on all difficult substrates
  • Permanently elastic bond - able to absorb stresses
  • Waterproof - for indoor and outdoor use
  • Resistant to chemical attack with impact sound-damping
  • Adjustable setting time

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Suitable for indoor and outdoor use and ensures a reliable and firm bond even on difficult subtrates like metal, wood, glass, synthetic resins and coatings - usually without a primer.

Step by step

Substrate preparation

CM 77 adheres to all clean, solid, load-bearing, even, dry  
 and moist substrates, which are free from substances which can reduce adhesion. Uneven areas or depressions should be levelled before (see Ceresit Flooring and Interior Finishes products). Coatings of insufficient load-bearing strength must be removed. Gypsum/anhydrite or paint coats (not chalking, good adhesion) must be mechanically roughened and freed from dust.

CM 77 adheres without special pre-treatment to metal, glass, wood, concrete, plasters, cement screeds, Xylolite, old tiles, artificial stone and heated screeds! Fresh cement screeds (3 to 5 days after installation) must be primed with CL 71 or CK 740.
Please refer to the Technical Data sheet!

No mixing - ready to use

Application

The adhesive should be applied with a suitable notched trowel, depending on the respective tile size. For indoor use, the mortar coverage (contact area) at the back of the tile must be at least 65 %. For outdoor use, a minimum mortar coverage of 90 % is required (combined laying method  should be used i.e. additionally apply a thin layer of the mortar on the tile backside).

Drying & cleaning

CM 77 is a silane-based adhesive and cures by contact with moisture (air humidity). To fasten the hardening process the adhesive layer should be sprayed with a thin water film.
Attention! Tools and tile surfaces cannot be cleaned with water - pre-clean the tools and surfaces with a dry cloth. Fresh adhesive residues can be removed with alkohol, oil or piant thinner; hardened material can only mechanically be removed.