Data and information on technical terms
FILM ASPECT
Gloss or opacity values were determined according to ISO 2813, equivalent to ASTM D 1471 and DIN 67530
MAT is a gloss of 0-10 gloss
SATIN-MAT (Eggshell) (eggshell) corresponds to a gloss of 10-20 gloss
SEMIBRILLANT corresponds to a gloss of 20-45 gloss
BRILLANT corresponds to a gloss of 45-75 gloss
VERY BRILLIANT is a gloss of 75-100 gloss
SHELF LIFE (product stability in the pot)
This is the time during which the paint can be used and stored in new and unopened containers, at temperatures between +5 and +30 ° C.
If the pot life time exceeds what is stated in the data sheets, the product - before being used - must be checked beforehand.
CONDITIONS AND TEMPERATURE OF THE SUPPORT
All types of substrates must always be thoroughly cleaned, deoxidized, degreased and descaled.
At the time of application, it is necessary to consider the temperature of the support and that of the air.
In order to avoid condensation phenomena on the surface that has just been painted, the temperature of the substrate must be at least 3 ° C higher than the dew point temperature.
Example with 70% relative humidity
Air temperature (° C) 5 ° 10 ° 20 ° 30 °
Dew point (° C) 0.0 4.7 14.4 23.9
Minimum acceptable substrate temperature (° C) 3.0 7.7 17.4 26.9
In general a reduction of the temperature entails a risk of condensation on the surface, which will consequently become opaque.
Example: The metal supports cooled by the night temperatures, often show traces of condensation, which disappear only when the surface is heated by solar radiation or by other means.
POLYMERIZATION TIME
It is indicated on the data sheets and corresponds to the time period after which the product is able to withstand the chemical - physical stresses for which it was formulated (normally 7-10 days after the application made at a temperature of +20 ° C).
SPECIFIC WEIGHT (PS = mass density)
With this symbol (PS), we define the mass of volumetric density, ie the specific weight (weight of the unit of volume) for each product.
The values given have a tolerance of ± 0.05 kg / liter.
DRY RESIDUE IN VOLUME (RSV)
This value is very important because it makes it possible to determine the Theoretical Efficiency (RT) of each product in relation to a determined thickness value of the film. The dry residue by volume was calculated with the ISO 3233 method, equivalent to the ASTM D 2697 and DIN 53219 methods.
THICKNESS OF THE FILM
The thickness of the film is subdivided into the thickness of the dry film (sp.s.) and the thickness of the wet film (sp.u.). The thicknesses of the dry film (sp.s.) have been indicated and must be respected on application with an approximation of 10%. In the opposite case, there may be defects concerning: covering power, sagging, drying, resistance, etc. To be sure of applying the optimal thicknesses one can measure, using some specific and very simple instruments, the thickness of the wet layer applied and calculate the dry film; in the same way it is possible to obtain the thickness of the wet layer to be applied starting from the desired dry film, by using the following very simple formulas:
Thickness SEC = Wet Thickness x % RSV / 100
WET Thickness = Dry Thickness x 100 / % RSV
PRACTICAL PERFORMANCE
The practical performance depends on many factors, such as the surface conditions, its profile, the method of application, whether it is high, medium, low solid paint, weather conditions, etc. Normally the practical efficiency is calculated for the metal surfaces at 70% of the theoretical yield, but this value can also go down to 40-50% ifthese are medium, small or very irregular surfaces. It is not possible, on the other hand, to calculate, in a precise way, the practical yields on wood surfaces, plaster, concrete, because there are many other factors like the impression of the support, the absorptions, the filling porosities, etc. ... that we can not know beforehand.
MIXING REPORTS
Two-component products must be used in the correct mixing ratio with its hardener.
Then it will be convenient to rinse the hardener pots with a little thinner and mix everything in the base product. By operating in this way, one is sure to use all the necessary amount of hardener. All calculations relating to the use of hardeners are stoichiometric and refer exclusively to our products. Any mix of our two-component products made using hardeners from other sources is strongly discouraged.
INDUCTION TIME
This is the time that passes between the mixing of two-component products and their use (it can vary from a few minutes to 15-20 'depending on the products, the ambient temperature and that of use).
POT LIFE (PRODUCT LIFE AFTER CATALYSIS)
It indicates, for two-component products, the time period during which the mixed product can be used (normally 4-5 h at + 20 ° C).
This time period decreases with increasing temperatures. Some hardeners may have very short pot life, so check what is indicated on the data sheets.
NB: All the above mentioned values refer to temperatures of + 20 ° C and relative humidity of 70%.
