ASTM D5325-03 (R2021) pdf free download.Standard Test Method for Determination of Weight Percent Volatile Content of Water-Borne Aerosol Paints.
1.1 This Lest method is for the determination of the weight percent volatile content of water-borne paints in aerosols.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
Slowly remove the ice pick from the hole. Leave the hole uncovered for about 12 to 16 h to allow most of the propellant to escape.
6.1.5 Enlarge the hole slightly by tapping the ice pick further into the can. Swirl the can gently for I to 2 mm to remove any remaining propellant.
6.1.6 Wipe off any condensate that may have accumulated on the can. Weigh the can to ±0.01 g.
6.1.7 Plug the hole with a small applicator stick (about ½ cm long) and then place masking tape over the plugged hole.
6.1.8 Place the can on the shaker in a position so that the hole is at the highest possible position to prevent leakage of contents. Shake the can for about 15 mm at the low speed setting.
6.1.9 Cut the bottom of the can using a metal cutter. Stir the contents with a spatula. then transfer the contents to a pint can with lid.
6. 1. 1 0 Rinse the aerosol can. agitators, and bottom several times using solvent. Allow the can, agitators, and the bottom to dry. Weigh to ±0.01 g.
7. Calculations
7. 1 Calculate the weight percent nonvolatile content (NV), of the paint in accordance with Test Method D2369.
7.2 Calculate the total weight percent nonvolatile content (TNV), in the aerosol can as follows:
8. Precision and Bias
8.1 Precision—Estimates are based on an interlaboratory study in which 1 operator in each of 5 laboratories analyzed in duplicate on 2 different days 1 sample of a water-borne aerosol containing 69 to 72 % organic volatiles. The coatings were commercially supplied. The results were analyzed in accordance with Practice E180. The within laboratory coefficient of variation was found to be 1.67 % relative at 9 df and the between laboratory coefficient of variation was 2.14 % relative at 7 df. Based on these coefficients, the following criteria should he used for judging the acceptability of results at the 95 % confidence level.
8.1.1 Repeatabiliiv—Two results, each the mean of duplicate determinations, obtained by the same operator on different days should be considered suspect if they differ by more than 5.36 % relative.
8.1.2 Reproducibility—Two results each the mean of duplicate determinations obtained by operators in different laboratories, should be considered suspect if they differ by more than 7.16%.
8.2 Bias—Bias cannot be determined because there are no accepted standards for weight percent volatile content of water-borne aerosol paints.
9. Keywords
9.1 aerosols; volatile content; water-borne paints.ASTM D5325 pdf download.