CM 740 Fast Fine

CM 740 Fast Fine is a pumpable, quick-drying self-levelling underlayment.

The product is quick setting, selfdrying and has a very good flow rate. The CM 740 is suitable for new construction and renovation. The product is intended for indoor use on substrates of concrete, lightweight concrete, stone, ceramic tiles, gypsum underlay, wood and homogenous PVC.

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Spécification de produit

Données techniques

Rejet de substances corrsive


Classe de résistance à la compression


Moyenne de résistance à la compression

35 MPa

Classe de résistance à la flexion


Moyenne de résistance à la flexion

8 MPa

Classe de résistance au feu




L'adhérence à la surface


Épaisseur 1

3–30 mm

Epaisseur 2

6–10 mm on lightweight concrete

Taille d'un grain

< 1 mm

Consommation de matières

1.6 kg/m²/mm

Poids (état sec)

1600 kg/m³

Les besoins en eau

4,2 l/20 kg


max 145 mm

Température de fonctionnement

10–25 °C

Temps de mélange

3 min

Temps de travail

10–25 min

Série finale

1–3 hrs

Recouvrable (tuiles)

12 hrs


12–24 hrs


approx. 11

Dégâts d'eau résistant


Bond de traction Force surface, 28 jours (surface polie, chargée)

> 1.5 MPa


0.03–0.05 %

TVOC 28 jours

30 μg/(m² h)



20 kg




The substrate should be clean and free of dust, cement skin, grease and other impurities that can prevent adhesion. Adhesion and surface strength of the substrate should be no less than 0.5 MPa. Always prime the underlying substrate with PP 600 and allow to dry before pouring. In terms of the primer forming a film, the temperature of the substrate must not fall below 10 °C. For best results, the ambient temperature in the work area should be between 10 and 25 °C. At higher or lower temperatures, the time for curing will shorten or extend. With the risk for cracks due to shrinkage or settings in the subfloor, a concrete surface should not be leveled within the first 28 days after casting. As a recommendation the RH in the concrete should have reached RH 90 % as the upper limit for pouring the CM 740. Use the Combimix form foam for edging. In order to avoid drainage pipes from getting clogged, always make sure the drains are properly sealed before pouring.


Mix the dry powder with max 4.2 liters of water (max 21 %) per 20 kg bag. Mix with a drilling machine and a whisk, or a mixing pump intended for this purpose. The correct water mixture can be tested using a slump test with a cylinder with Ø 30 mm and a height of 50 mm on 300 x 300 mm plexiglas plate. With the correct water mixture, the spread should be max 145 mm. The slump test also checks that the material is well blended and that there is no separation.


The mixed material is applied by hand, or pumped out onto the substrate in lengths. Each new ribbon is added to the old one as soon as possible so that the material can blend together and create an even surface. The width of the ribbons can be adjusted to the capacity of the mixing pump and the thickness of the covering. The material requires a light treatment with a toothed trowel to provide maximum smoothness.

Post-traitement et de durcissement

You can easily shape or cut the semi hardened self-leveling underlayment material before it fully dries. Always make sure that the material is sufficiently dry before it will be covered by a carpet or a foilsystem. The CM 740 may be covered by a carpet or a foilsystem after 12–24 hours depending on the thickness. The guiding value assumes a curing temperature of approximately 20 °C, 40 % RH and proper air flow.

Calculateur de consommation

CM 740 Fast Fine

Calculateur de consommation


+46 171 46 65 90

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Contactez nous

  • Verkstadsvägen 6
  • 746 40 Bålsta, Suède
  • Tél. 46 171 46 65 90
  • Fax. 46 171 46 65 99
  • E-mail:


Combimix développe et fabrique des produits à base de minéraux pour l'industrie de la construction. Notre gamme de produits comprend des produits pour le nivellement du sol, crépi de la façade, le rendu, le resurfaçage du béton et du mortier de restauration des bâtiments culturels. Nous effectuons des ventes en Suède, au Danemark, en Norvège et aux États-Unis.

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