Description
TULEKINDEL BETOON NAKS 1200
FIRE CONCRETE NAKS 1200
Compressive strength class C35/45
With excellent heat resistance, aluminous cement-based strong cast concrete.
Highest usage temperature: up to + 1200 0C
To be used for casting hearth elements in stove and fireplace ceilings, bearing surfaces of heart grinds and supports.
In places concrete may be exposed to high temperatures
COMPOSITION
Cementing agent aluminous cement, additives and fire resistant infilling with grain size not exceeding 3 mm.
TECHNICAL SPECIFICATION
Density: 2100-2200 kg/m3
Compressive strength class in normal conditions C35/45
One mix powder package of 25 kg makes 11-12 litres of ready-made concrete.
PREPARATION
Pour necessary quantity of mix powder into a mixing vessel or mixer.
Add water 14-15% of the weight of the mix (3.3-3.75 litres per package of 25 kg).
Mix mechanically or manually until the mix becomes totally wet.
Ready-made mixture to be used in 1 hour.
CASTING
Minimum working temperature +5 0C.
As thermal expansion of steel is greater than fire concrete, the cast must not be reinforced with steel.
Concrete plates with a size not exceeding 600 x 600 or 800 x 400 should be used for hearth reinforcing. Minimum thickness of the plate 50 mm, of wider plates 100 mm.
Concrete permanent expansion of +0.5-0.6% is formed at + 1200 0C.
Setting time of the mix is 4-10 hours, depending on the layer thickness and environmental conditions.
USEFUL TIPS
Before usage let the hearth dry 2-3 weeks in open ventilation conditions.
First heating must be performed with small flames and in short cycles. Leave flues open after first heating. Use the hearth in full capacity only after repeated firing-up procedures.
STORAGE
Store mix powder packages in a dry room.
Shelf life of the mix powder is 6 months from the manufacturing date.
