ISO 2811-1:2016 pdf free download.Paints and varnishes Determination of density Part 1:Pycnometer method
Peintures et vernis — Determination de Ia masse volumique — Pa rtie 1: Méth ode pycnométrique.
8.2 Determination
If working with a temperature-controlled chamber (see A), put the pycnometer (i) and the test sample next to the balance (±Z) in the chamber maintained at the specified or agreed temperature.
If working with a water bath (see A) rather than a temperature-controlled chamber, put the pycnometer and the test sample in the water bath, maintained at the specified or agreed temperature.
Allow approximately 30 mm for temperature equilibrium to be reached.
Using the thermometer (), measure the temperature, tT, of the test sample.
Check throughout the determination that the temperature of the chamber or water bath remains within the specified limits.
Weigh the pycnometer and record the mass, ml, to the nearest 10 mg for 50 cm3 to 100 cm3 pycnometers and to the nearest 1 mg for pycnometers less than 50 cm3 in volume.
Fill the pycnometer with the product under test, taking care to avoid the formation of air bubbles. Place the lid or stopper of the pycnometer firmly in position and wipe off any excess liquid from the outside of the pycnometer with an absorbent material wetted with solvent; wipe carefully with cotton wool.
Record the mass of the pycnometer filled with the product under test, m.
NOTE Liquid adhering to the ground-glass surfaces of a glass pycnometer or to the areas of contact between the lid and body of a metal pycnorneter causes too high a balance reading. This source of error can be minimized by ensuring that the joints are firmly seated and by limiting air bubbles.
10.1 Repeatability limit, r
The value below which the absolute difference between two single test results, obtained on identical material by one operator in one laboratory using the same equipment within a short interval of time using the standardized test method, may be expected to lie, with a 95 % probability, is
— 0,001 g/cm3 for solvents, and
— 0,0 05 g/cm3 for coating materials.
10.2 Reproducibility limit, R
The value below which the absolute difference between two test results, obtained on identical material by operators in different laboratories using the standardized test method, may be expected to lie, with a 95 % probability, is
— 0,002 g/cm3 for solvents, and
— 0,007 g/cm3 for coating materials.
11 Test report
The test report shall include at least the following information:
a) all details necessary to identify the product tested;
b) a reference to this part of ISO 2811, i.e. ISO 2811-1;ISO 2811-1:2016 pdf free download.
Tags: Paints and varnishes
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