ASTM_D_3890_-_05_2010.pdf

Designation:D389005(Reapproved 2010)Standard Test Method forNumber of Strokes to Prime a Mechanical Pump Dispenser1This standard is issued under the fixed designation D3890;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of 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 the numberof actuations required to prime a pump dispenser(spray andflow types)with a consumer-type product.1.2 This standard does 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 method can be used to visually comparepriming characteristics of different pump dispensers and dif-ferent products.2.2 This test method is suitable for establishing specifica-tions for both the pump dispenser and the final package.3.Apparatus3.1 No apparatus is required,although a mechanical devicefor actuating the pump dispenser may be used.4.Sampling4.1 Select an appropriate number of dry,unused pumpdispensers at random for the precision and accuracy desired.Anumber of ten test specimens are recommended,but a mini-mum of three is acceptable.5.Conditioning5.1 If possible,condition the test specimens at 23 6 3C(736 5.4F)for not less than 4 h.If the test specimens are notconditioned at the recommended temperature,this should benoted in the test report discussed in 8.1.5.2 Test pumps should be tested no sooner than 24 h afterassembly when possible.If the pumps are not conditioned atthe recommended time,this should be noted in the test reportdiscussed in 8.1.6.Test Specimens6.1 For each test specimen,select a container to which thepump dispenser will be attached during the test.Since the diptube length affects the number of strokes to prime,the actualbottle of the final package is recommended for testing.7.Procedure7.1 Fill each container with the product to be tested at theactual level of the final package target weight.7.2 Attach the pump dispenser securely to the container.Thepump should be in the off,locked,or closed position.Take carenot to actuate the pump dispenser during this step.NOTE1If the actuator is placed onto the pump after the pump hasbeen secured onto the container,then report this additional stroke in thefinal results in 8.1.NOTE2If an actuation is required when opening or unlocking thepump,then report this additional actuation in the test report discussed in8.1.7.3 If the pump dispenser is equipped with an overcap orlocking feature,remove or release the feature to permit thepump dispenser to be in the operable mode.7.4 If the pump dispenser has a variable output-per-strokefeature,make an appropriate adjustment to achieve the desiredoutput-per-stroke at this time.Report this desired dosage in8.1.7.5 Actuate the pump dispenser to its fullest extent withsmooth,firm,and even pressure.Allow the pump mechanismto fully return before beginning the next stroke.NOTE3Depending on the venting system,some mechanical pumpdispensers can have variation in the number of strokes-to-prime due to thetime that the priming vent is opened.It is suggested that a rate of 90 6 15strokes per minute be used.For some viscous products,this rate may betoo fast for the mechanical pump dispenser to fully return.If the rate ofactuation is outside of this rangefaster or slower,report in 8.1.7.6 Record the number of full strokes until the first fulldischarge of product is observed.NOTE4If the visual determination of the first full stroke is notaccurate enough,the amount of product dispensed by the mechanicalpump dispenser may be weighed after each stroke,and the amountdispensed would be determined by subtracting the post-stroke weight fromthe pre-stroke weight.The strokes-to-prime number to be recorded wouldthen be the count value that shows the first consistent weight dispensed.1This test method is under the jurisdiction of ASTM Committee D10 onPackaging and is the direct responsibility of Subcommittee D10.33 on MechanicalDispensers.Current edition approved Oct.1,2010.Published March 2011.Originallyapproved in 1980.Last previous edition approved in 2005 as D3890 05.DOI:10.1520/D3890-05R10.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 NOTE5If the pump does not prime within 25 strokes,that pumpshould be inspected for the cause of not priming.This pump should bereported in 8,but not included in the statistical results.8.Report8.1 Report the following information:8.1.1 Product description,type of pump dispenser beingtested,dip tube length used,and for variable dosage pumps,thedosage selected,8.1.2 Mean,maximum,minimum,and standard deviat