1、Designation:D306094(Reapproved 2013)Standard Test Method forPressure Drop Rate of Compressed Gas-PropelledProducts1This standard is issued under the fixed designation D3060;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of
2、last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of pressuredrop rate of compressed gas-propelled products.1.2 This standard does
3、not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Significance and Use2.1 This test metho
4、d is applicable to all products packagedin prepressurized containers,and is rapid and reproducible.2.2 Actual usage dispensing conditions are simulated in thetest.2.3 This test method is such that any slight variance invalves and actuators are overcome,and the final equilibriumpressure in the contai
5、ner is correlated to the amount of productdispensed.3.Apparatus3.1 Gage(Fig.1)Prepressurize the gage with compressedgas to a pressure 5 psi(34 kPa)higher than the expectedpressure in the container,to determine if the assembly isgastight.If the gage pressure remains constant,the assembly issufficient
6、ly gastight.NOTE1Prepressurizing the gage 5 psi(34 kPa)higher than theexpected container pressure also minimizes the possibility of gagecontamination when measurements are taken through the valve.If thegage is at a significantly lower pressure than the container when the gagevalve is opened,aerosol
7、product will enter the gage and possibly affect itsaccuracy.4.Sampling4.1 Samples shall be selected representing the true productformula either from production or the laboratory.5.Conditioning5.1 Refrigerate products normally refrigerated at 40F(4.4C)for at least 24 h before testing.5.2 Keep product
8、s normally stored at room temperature at70C(21C)for a minimum of 24 h before testing.6.Procedure6.1 Mass DeterminationWeigh a replicate of three filledcontainers,and record the mass in grams.6.2 Pressure Determination:6.2.1 Using the prepressurized gage,check the equilibriumpressure in the container
9、 to minimize product or pressure loss.6.2.2 For products that require shaking,as indicated in thedirections on the label,shake as follows:6.2.2.1 Grasp the container in an upright position,and movethe arm downward in an arc.As the arm moves downward,invert the container.Exert enough force in the mot
10、ion to throwthe product to the top end of the container.Then bring thecontainer back to the starting position.6.2.2.2 Repeat 6.2.2.1 for a total of ten times,pausing for afew seconds between the cycles.6.2.3 Do not agitate products that are dispensed withoutshaking,before determining the equilibrium
11、 pressure.6.3 Dispensing:6.3.1 If required,shake the container in accordance with6.2.2.1 and 6.2.2.2,and record the pressure before eachdispensing.6.3.2 Holding the container in the proper position,dispensea weighed amount at 5-min intervals.6.3.3 Regulate the rate of dispensing so that the product
12、isexpelled in a given number of dispensings.(See Table 1 for therecommended number of dispensings.)6.3.4 Record the mass in grams of the product dispensedafter each dispensing.6.3.5 Stop dispensing when the first gas discharge is ob-served.Weigh the container,and record the final equilibriumpressure
13、.6.4 Maximum Delivery:6.4.1 Hold the container,without dispensing,in the dispens-ing position(inverted for invert style valves,and upright fordip tube valves)for a 2-min period.1This test method is under the jurisdiction of ASTM Committee D10 onPackaging and is the direct responsibility of Subcommit
14、tee D10.33 on MechanicalDispensers.Originally developed by the Chemical Specialties Manufacturers Assn.Current edition approved April 1,2013.Published April 2013.Originallyapproved in 1972.Last previous edition approved in 2005 as D3060 94(2005).DOI:10.1520/D3060-94R13.Copyright ASTM International,1
15、00 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 NOTE2Do not shake the container after standing.6.4.2 Dispense the product until the gas supply is exhausted;then weigh the container.6.5 Tare Mass:6.5.1 To obtain the tare mass,cut open the container,wash,and dry it.Weig
16、h the container,and record the mass in grams,as the tare mass.7.Calculation7.1 Tabulate the mass of the product in grams versus theequilibrium pressure in the container.7.2 Plot the mass of the product in grams on the abcissasand the equilibrium pressure on the axis of ordinates to obtaina pressure drop graph.8.Precision and Bias8.1 PrecisionThis test method is being reviewed fordevelopment of a precision statement based upon intralabora-tory test data.Volunteers from various CSMA AerosolDivisio
