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CM 920 Design

CM 920 Design is a is polymer modified and pigmented pumpable self-levelling compound.

The CM 920 Design is suitable for new construction and renovation. The product is intended for indoor use on concrete and other hard substrates. The product may be used as an wear surface* in fx. domestic areas, offices spaces or shopping malls. * Color deviations of the product may occur.

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Product specification

Technical data
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Release of corrsive substances

CT

Compressive strength class

C30

Compressive strength average

32 MPa

Flexural strength class

F6

Flexural strength average

7,5 MPa

Fire resistance class

A1fl

RWA

100

Adhesion to surface

B1.5

Thickness 1

8–20 mm

Grain size

≤ 2 mm

Material consumption

1.7 kg/m²/mm

Weight (dry state)

1700 kg/m³

Water requirements

4,6–4,9 l/20 kg

Flow rate

max 140 mm (white), max 145 mm (other colors)

Workplace temperature

10–25 °C

Mixing time

2+1 min

Working time

15–20 min

Final set

approx. 2 hrs

Paintable with epoxi or similar

3–5 days

pH

approx. 11,5

Water damage resistant

yes

Shrinkage

≤ 0,03 %

Packaging
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92005-1

Vit 20 kg

92003-1

Vit 1000 kg

92005-2

Ljusgrå 20 kg

92003-2

Ljusgrå 1000 kg

92005-3

Mellangrå 20 kg

92003-3

Mellangrå 1000 kg

92005-4

Svart 20 kg

92003-4

Svart 1000 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 920 Design. 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.

Mixing
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Mix the dry powder with 4.6–4.9 liters of water (23–24 %) 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 140 mm for the white and max 145 mm for the other colors. 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 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. The product is paintable with epoxi or similar after 3–5 days depending on the thickness. Always make sure that the material is sufficiently dry before it gets overcoated. The guiding value assumes a curing temperature of approximately 20 °C, 40 % RH and proper air flow.

Consumption calculator

CM 920 Design

Consumption calculator

phone

+46 20 21 21 00

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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