FF 830

FF 830 is a dust reduced, quick-drying finishing underlayment designed for skim-coating, smoothing and leveling prior to the application of floor coverings.

The FF 830 is suited for new construction and renovations. The product is intended for indoor use on substrates of concrete, lightweight concrete, ceramic tiles, gypsum boards, wood and homgenous PVC. FF 830 is easy to use and yields a very smooth surface finish.

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Product specification

Technical data

Release of corrsive substances

CT (as per EN 13813)

Compressive strength class

C25 (as per EN 13813)

Flexural strength class

F6 (as per EN 13813)

Fire resistance class

A1 (as per EN 13813)

Adhesion to surface

> 2 MPa (as per EN 13813)

Thickness 1

0–12 mm

Thickness 2

6–12 mm lightweight concrete

Grain size

< 70 µm

Material consumption

1.2 kg/m²/mm

Weight (dry state)

1200 kg/m³

Water requirements

1,8 l/4,5 kg

Workplace temperature

10–25 °C

Mixing time

2+1 min

Working time

15–20 min

Final set

30–60 min

Coverable (tiles)

1 hr


1–3 hrs


approx. 11

Water damage resistant


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

> 1,5 MPa


0,03–0,05 %

TVOC 28 days

< 10 μg/(m² h)



4,5 kg




The substrate shoul be clean and free of dust, cement skin, grease or other impurities that can prevent adhesion. Adhesion and surface resistance of the substrate should be no less than 0.5 MPa. Weak and porous substrates should always be primed with PP 600 and allowed to dry before applying FF 830. 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 95 % as the upper limit for applying the FF 830.


Mix the dry powder with max 1,8 liter water (max 40 %) per 4,5 kg bag. Mix for 3 minutes with a drilling machine and a whisk to obtain a lump free mix. Product may be refreshed by re-mixing but do not ad more water.


Apply the FF 830 to substrate with a steel trowel. After initial set, apx 10–15 min., remove any overlap marks, seams and inconsistencies by scraping with the steel trowel.

Post-treatment and curing

Protect FF 830 from excessive heat or draft conditions during the curing process. Protect for up to 24 hours after completed installation. FF 830 can be walked on after 30 minutes. Always make sure that the material is sufficiently dry before it will be covered by a carpet. The FF 830 may be covered by a carpet after 1–3 hours. The guiding value assumes a curing temperature of approximately 20 °C, 50 % RH and proper air flow. Newly produced surfaces must be protected against wind, sun and rain.

Consumption calculator

FF 830

Consumption calculator


+46 171 46 65 90

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Contact us

  • Verkstadsvägen 6
  • 746 40 Bålsta, Sweden
  • Tel. +46 171 46 65 90
  • E-mail: [email protected]


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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