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CM 840 Fine

CM 840 is a multipurpose trowelable patching compound for underlayments.

CM 840 can be installed on all types of concrete, well-bonded gypsum, bonded ceramic tile, quarry tile, Vinyl (non-cushion backed), VAT, VCT and PVC. Use Primer to block contact with gypsum-based surfaces. CM 840 is perfect for repairing cracks or creating slopes to drains. It may also be used on walls for repairs.

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Spécification de produit

Données techniques
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Rejet de substances corrsive

CT

Classe de résistance à la compression

C25

Moyenne de résistance à la compression

32 MPa

Classe de résistance à la flexion

F6

Moyenne de résistance à la flexion

7 MPa

Classe de résistance au feu

A1

L'adhérence à la surface

> 1 MPA

Épaisseur 1

0–50 mm

Epaisseur 2

6–20 mm

Taille d'un grain

< 0.5 mm

Consommation de matières

1.7 kg/m²/mm

Poids (état sec)

1700 kg/m³

Les besoins en eau

4,2 l/15 kg

Température de fonctionnement

10–25 °C

Temps de mélange

2+1 min

Temps de travail

20–30 min

Série finale

30–60 min

Recouvrable (tuiles)

1 hr

Carpetable

1–3 hrs

pH

approx. 11

Dégâts d'eau résistant

yes

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

> 1 MPa

Rétrécissement

0.03–0.05 %

Emballage
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84007

15 kg

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Utilisation

Pré-traitement
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The substrate should be clean and free of dust, cement skin, grease and other impurities that may prevent adhesion. Adhesion and surface resistance of the substrate should be no less than 0,5 MPa. Always prime the substrate with PP 600 and allow to dry before pouring (see PP 600 datasheet for proper dilution and installation directions). In terms of the primer forming a film, the temperature of the substrate must not be below 10 °C. For best results, the ambient temperature in the work area should be between 10-25 °C. At higher or lower temperatures, the time for curing will shorten or extend. Protect the product from excessive heat, excessive cold and draft conditions during and after the installation. It is recommended that the installation should be done with a proper air ventilation from an HVAC system. 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 applying the CM 840.

Mélange
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Mix the dry powder with max 4.2 L of cold, potable water, max 28 %, per 15 kg bag. Do not overwater. Mix for 2 minutes with a heavy duty drill mixer (650 minimum rpm) to obtain a lump-free mix.Let the mixed CM 840 rest for 1 minute and then mix it for 1 minute again. Product may be refreshed by re-mixing but do not ad more water.

Application
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Apply blended material onto substrate at a thickness of 0–50 mm for all surfaces by using a steel trowel. After initial set of material (approx. 10–15 min.), remove any overlap marks, seams and inconsistencies by scraping with a steel trowel.

Post-traitement et de durcissement
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Protect CM 840 from excessive heat or draft conditions during the curing process. Protect for up to 24 hours after completed installation. Material can be walked on after 30–45 minutes. Before covered by carpet be sure that the subfloor is dry enough. CM 840 is coverable after 1-3 hours. The guiding value assumes a curing temperature of approximately 20 °C, 40 % RH and proper air flow.

Calculateur de consommation

CM 840 Fine

Calculateur de consommation

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+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: info@combimix.com

Combimix

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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