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CM 900 Industrial Base

CM 900 Industrial Base is a pumpable self-levelling underlayment.

The product is intended for indoor use on substrates of concrete. CM 900 is used as a build-up and sublayer to CM 920, CM 920 Design, CM 940 or CM 960.

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Product specification

Technical data
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Release of corrsive substances

CT

Compressive strength class

C25

Compressive strength average

35 MPa

Flexural strength class

F5

Flexural strength average

7 MPa

Fire resistance class

A1fl

Adhesion to surface

B1.5

Thickness 1

5–50 mm

Grain size

< 2 mm

Material consumption

1.7 kg/m²/mm

Weight (dry state)

1700 kg/m³

Water requirements

3,4 l/20 kg

Flow rate

max 125 mm

Workplace temperature

10–25 °C

Mixing time

3 min

Working time

15–25 min

Final set

1–3 hrs

pH

approx. 11

Water damage resistant

yes

Surface Tensile Bond Strength, 28 days (sanded, loaded surface)

> 1.5 MPa

Shrinkage

0.03–0.05 %

Packaging
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90005

20 kg

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Use

Pre-treatment
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The substrate should be clean and free of dust, cement skin, grease and other impurities that can prevent adhesion. Adhesion and surface resistance of the substrate should be no less than 1.5 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 900. Use the Combimix form foam for edging. In order to avoid drainage pipes from getting clogged, always make sure that the drains are properly sealed before pouring.

Mixing
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Mix the dry powder with max 3.4 liters of water (max 17 %) 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 a 300 x 300 mm plexiglas plate. With the correct water mixture, the spread should be max 125 mm. The slump test also checks that the material is well blended and that there is no separation.

Application
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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-treatment and curing
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You can easily shape or cut the semi-hardened self-leveling underlayment material before it fully dries. CM 900 shall always be coated with a toplayer of CM 920, CM 920 Design, CM 940 or CM 960. The product shall not be coated with epoxy or PU directly.

Consumption calculator

CM 900 Industrial Base

Consumption calculator

phone

+46 171 46 65 90

Call our order department

Contact us

  • Verkstadsvägen 6
  • 746 40 Bålsta, Sweden
  • Tel. +46 171 46 65 90
  • Fax. +46 171 46 65 99
  • E-mail: info@combimix.com

Combimix

Combimix develops and manufactures mineral-based products for the construction industry. Our product range includes products for floor levelling, façade plastering, rendering, concrete resurfacing and restoration mortar for cultural buildings. We conduct sales in Europe and USA.

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