• As there is a large variety of pre-mixed plasters available, we suggest to do a sample test on a small area before executing the whole job.
Natural lime finishing plaster
FEATURES AND RANGE OF USE
CALCHÈRA Rasatura is a fine paste suitable for creating the very smooth, translucid finishes known as “calce rasata”. It has a base of lime paste, colouring earths, micronized marble, vegetable additives. After application it reacts with the carbon dioxide present in the environment, giving rise to microcrystalline calcium carbonate. In addition, reacting at the same time with the calcium salts of the plaster, this product gives rise to calcium carbonate, a mineral with chemical-physical characteristics resembling those of building materials. CALCHÈRA Rasatura presents an excellent adhesion on mineral surfaces based on lime mortar or cement-lime mortal, even if seasoned. The vapour permeability of CALCHÈRA Rasaturais very good, insofar as the microcrystalline structure resulting from the precipitation of calcium carbonate does not modify the porosity of the plaster. Thanks to the high degree of alkalinity deriving from the inorganic nature of coating,CALCHÈRA Rasatura is particularly resistant to mould and fungi. To these peculiar characteristics CALCHÈRA Rasatura adds chromatic effects of great elegance similar to those of colour finishes of the past.
RULES FOR USE – PREPARATION OF BASE
Lime mortar plasters, cement-lime mortar and cement mortar plasters, even though seasoned, devoid of patches or plastic coatings, if very absorbent, must be dampened with water the day before application of CALCHÈRA Rasatura. Attention: it is absolutely forbidden using solvent-based primers.
We recommend to apply with any type of surface a priming coat of FIXAFOND B400 to provide a uniform base.
The ready-to-use product is thixotropic. Mix it gently until it is workable. Should there be a liquid surface layer present, this does not affect the quality of CALCHÈRA Rasatura. In this case set aside a part of the liquid, stir the product and, if necessary, add a part of the liquid until the product is perfectly workable. Spread CALCHÈRA Rasatura in two coats using a stainless steel trowel moving it with a semi-circular motion. To obtain the translucid smooth finish, the second coat must be made compact and slick using the edge of the stainless steel trowel. Do not apply CALCHÈRA Rasatura on surfaces exposed to direct sunlight or with temperatures conditions that can drop below 5°C in the first 24 hours after application. Protect the treated surfaces for at least 48 hours from heavy rain. Clean all tools with water immediately after use. Light and dark shading are features of the product.
Specific weight: 1.52 kg/l ± 0.10
PH value: 13.0
Dry extract: 55 % ± 0.10
Viscosity: product in paste not definable
Coefficient of resistance to the passage of water vapour m = 12
Resistance to saponification: excellent. Mineral product
Resistance to fire : non-inflammable
On average, for a workmanlike job, consumption is approx. of 1 kg/m² corresponding to a thickness of 0.3 mm on fine mortar.
CONTAINERS, COLOURS AND WARNINGS
CALCHÈRA Rasatura comes in 20 kg drums in the colours indicated in the colour fan. The product must be kept in its original container within a temperature range between 5°C and 30°C. You are recommended to use up the product within 6 months of the production date. CALCHÈRA Rasatura contains natural lime: avoid any contact with eyes by wearing suitable goggles. In the event of contact with eyes, wash thoroughly for at least 15 minutes with plenty of water. If the irritation persists, consult a doctor.