ASTM D7952-15(R2021) pdf free download.Standard Test Method for Measuring Aspiration Potential of Aerosol Products.
1.1 This test method covers a small-scale laboratory procedure to determine the aspiration potential of aerosol products by determining spray pattern and aerosol deposition rates.
1.2 This test method has been developed to address a need to identify which aerosol products may present an aspiration risk such that special labeling andlor child-resistant packaging would he appropriate. Studies based on this method may allow the development of a practice to identify such aerosol products.
1.3 Although this method may be useful for testing non- pressurized aerosol products, its development has been limited to testing pressurized aerosols.
1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
6. Procedure
6.1 Weigh weighing cup to nearest 0.0001 g and attach to middle of Plexiglas sheet with jeweler’s sticky wax.
6.2 Set aligning apparatus at end of Plexiglas sheet so that vertical is exactly 11 in. (28 cm) from the center of the test cup.
6.3 Shake aerosol container according to directions or for I mm. if directions are not available.
6.4 Spray aiming to hit the middle of the test cup. Continue spraying for 5 to 7 s. Time the actual spraying time precisely with a stop watch.
6.5 Remove the test cup and re-weigh within 6() s.
6.6 Repeat the above sequence for a total of three test runs. After each run, clean Plexiglas surface with VM & P naphtha.
6.7 Record spray pattern and weight of aerosol deposited per run in g/s.
6.8 Conduct spraying at an ambient temperature of 20 ± 2 °C in a draft-free room.
7. Calculation or Interpretation of Results
7.1 Calculate average and standard deviation of deposition rate for each aerosol product.
7.2 Record spray pattern for each spray session.
7.3 A mist is defined as a spray pattern that does not completely cover the bottom of the test cup after 5 to 7 s of spraying.
7.4 A stream is defined as a spray pattern which is completely contained within the test cup: pooling of the test material occurs in the bottom of the cup.ASTM D7952 pdf download.