ISO 22516:2019 pdf free download – Paints and varnishes一Practical determination of non-volatile and volatile matter content during application.
33
volatile matter
VM
loss by mass obtained by evaporation under specified conditions of test
3.4
volatile matter after defined process step
VM
loss by mass obtained after the application from the single process steps of examination under specified conditions of test
4 Principle
An aluminium foil or a test panel in production or in laboratory spray booth is coated in accordance with the specified conditions. The coated aluminium foil or test panel is carefully folded down the centre and weighed after the process step of examination and then unfolded. Subsequently, the aluminium foil is dried in horizontal position in a laboratory drying box in accordance with the agreed drying conditions and weighed afterwards. The content of non-volatile or volatile matter is calculated from the difference.
5 Apparatus and materials
Ordinary laboratory apparatus, together with the following:
5.1 Application device
Coating unit and, if necessary, conveying drier for the process step of examination.
5.2 Laboratory drying box, capable of maintaining the specified or agreed test temperature to ±2 °C (for temperatures up to 150 °C) or ±3,5 °C (for temperatures above 150 °C and up to 200 °C). A laboratory drying box with technical ventilation shall be used.
WARNING — Due to explosion and fire control, careful handling is indispensable for products containing flammable volatile constituents.
5.3 Method A with aluminium foil
5.3.1 Aluminium foil, soft quality with a thickness of(30 ± 2) 1Am, cut to the format of 90mm x 130mm or as agreed.
5.3.2 Magnetic fixture frame to secure the foils on the object to be coated matching the measures of the foil piece (e.g. outside: 110 mm x 150 mm, inside: 60 mm x 100mm).
NOTE PVC/polyvinylidene chloride coated fixture frames have been found suitable.
5.3.3 Appropriate tape to secure the fixture frames on non-magnetic substrate.
5.3.4 Precision balance, weighing to 0,1 mg.
5.4 Method B with test panel
5.4.1 Test panel measuring approximately 200 mm x 100 mm and of a thickness of 0,7 mm to 1,0 mm and shall be prepared, coated, and dried/cured in accordance with ISO 1514.
5.4.2 Appropriate tape to secure the test panel (if necessary).
A.1 Parameters of the round-robin test
The precision data were determined in accordance with method A (see .72) on a water-thinnable base coat with a coating machine with electrostatic high-efficiency rotary atomizer and pneumatic air atomizer unit on five successive days during shift operation.
Application conditions and climatic conditions were constant during application.
Procedure and evaluation of the round-robin test were in accordance with Iso 5725-2 and ISO/TR 22971.
The non-volatile matter was obtained directly after application and after intermediate drying.
For the graphic presentation of the raw data of the round-robin test directly after application see Figure A.1. The results are given in Table A.1.
For the graphic presentation of the raw data of the round-robin test after intermediate drying see Figure A.2. The results are given in Table A.2.