ASTM D3094-2000(2010) Standard Test Method for Seepage Rate of Aerosol Products《气溶胶产品渗出率的标准试验方法》.pdf

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1、Designation: D3094 00 (Reapproved 2010)Standard Test Method forSeepage Rate of Aerosol Products1This standard is issued under the fixed designation D3094; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A

2、 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 approxi-mate mass loss due to valve seepage rate2of aerosol productsby the collection and

3、 measurement of gases seeping throughthe valve and into a special eudiometer tube, over a relativelyshort time period.1.2 It can be shown that the average refrigeration-filledaerosol product seeps to the extent of approximately 3.0 mLwhen the corresponding mass loss is 0.10 oz (2.9 cm3)/year.This fi

4、gure is partially based on air content and is subject tovariations according to filling conditions. This test method isnot considered dependable when applied to pressure-filled,unpurged aerosol products.1.3 The values stated in inch-pound units are to be regardedas standard. The values given in pare

5、ntheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.4 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-pria

6、te safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Significance and Use2.1 This test method affords a more rapid answer to theever-present problem of mass loss during storage. It is ofparticular value in determining the effectiveness of valve st

7、akeand clinch seal elastomers in contact with new formulations.This test method may also be used to evaluate new valves withstandard mixtures.3. Apparatus3.1 Bath, constant-temperature, equipped with a thermo-regulator sufficient to maintain water at 80 6 2F (26 6 1C).The tank should be of sufficien

8、t proportions to accommodatethe necessary number of test specimens in an upright position,so that each specimen is surrounded by approximately 1 in. (25mm) of water.3.2 Eudiometer Tubes (Fig. 1 and Fig. 2), custom-orderedor hand-made, with an internal volume of 5.0 mL net (allowingfor any part of th

9、e valve that might protrude into the tube). Itis convenient to calibrate in 1, 2, and 3-mL divisions.NOTE 1For tests involving many dispensers, small test tubes and vialshave been successfully substituted for the tubes in Fig. 1 and Fig. 2.4. Test Specimens4.1 Test specimens shall be prepared in acc

10、ordance withproduction methods wherever possible, making certain that theclinch diameter and the depth of clinch below the curl of themounting cup are in agreement with the specifications. Newdispensers shall be pretested for leakage by heating thecontents to 130F (54C).5. Procedure5.1 Fill the bath

11、 with water that has been allowed todeaerate for 24 h at room temperature. Bring the bath to 80F(26C) and immerse the dispensers.5.2 Scrub the bath walls, bottom, and dispenser surfaces toremove adhering air. Give the dispensers a hard knock torelease any air bubbles clinging to the valve parts.5.3

12、Submerge the eudiometer tubes and fill them. Removethe air bubbles. Invert the tubes over the dispenser valves andallow them to remain for 48 h.1This test method is under the jurisdiction of ASTM Committee D10 onPackaging and is the direct responsibility of Subcommittee D10.33 on MechanicalDispenser

13、s. This test method was originally developed by the Chemical SpecialtiesManufacturers Assn.Current edition approved Oct. 1, 2010. Published November 2010. Originallyapproved in 1972. Last previous edition approved in 2005 as D3094 00 (2005).DOI: 10.1520/D3094-00R10.2Data on the theoretical developme

14、nt of seepage concepts has been filed atASTM Headquarters as RR:D10-1000.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.4 Give each dispenser a hard knock to free the clinginggas into the inverted eudiometer tube. Determine and re

15、cordthe amount of gas in each tube.5.5 The mass loss due to seepage through the valve andO-ring seal represents only a part of the total mass loss.Leakage will also occur at the seams and seam junctures.5.6 There is usuallya1to2-week adjustment period withnew dispensers, during which some perturbati

16、ons in seepagerate will occur. After this, a reasonably steady day-to-day rateis assumed.NOTE 2Many dispensers are found to rust slightly when stored underwater for 2 days. This condition may be remedied by employing a bathsolution containing 0.5 % sodium nitrate (NaNO3) and 0.5 % triethyleneglycol

17、in water. In a more concentrated solution, triethylene glycol exertsa softening effect upon enamel dispenser finishes.6. Calculation6.1 Correct the volume of gas collected in the eudiometertube to allow for water solubility. Since the degree of solubilitydiffers with the composition of gas, use the

18、following equationsin accordance with the chemical content of freshly diffusedgas:For all mixtures of P-11 and P-12:Vc5 Vo5 0.29 1 0.66 NP 5 11! (1)For difluorodichloromethane only:Vc5 Vo1 0.29 (2)For trichlorofluoromethane only:Vc5 Vo1 0.95 (3)where:Vc= corrected column of gases in eudiometer tube,

19、Vo= observed volume of gases in eudiometer tube,andNP=11= mole fraction or volume %/100 of trichloro-fluoromethane in the gas as it is diffused into thetube (before selective solubility changes the gascomposition).NOTE 3Eq 2 and Eq 3 are special cases of Eq 1. Eq 1 is simplified andaccurate to 0.1 m

20、L only.6.2 Corrections for aerosols containing several standardpropellants are presented in Fig. 3. All data is based on the useof standard 5.0-mL eudiometer tubes. For example, an air-freeaerosol containing 50 % each of P-11 and P-12 as propellantswill diffuse an observed 2.73 mL of gas under test

21、conditionswhen the seepage is 0.10 oz (2.9 cm3)/year through the valve.The gas will be predominantly difluorodichloromethane.7. Precision and Bias7.1 Precision The precision of D3094 is highly dependenton the contents and type of aerosol packaging being tested.One laboratory conducted a seepage test

22、 on a water-based hairmousse. The results are shown in Table 1. The results of thistest are dependent on variations in filling the contents (bothpropellant and product concentrate), the solubility of thepropellant used, the head space in the particular can as well asthe level of the product in the c

23、an at the time of testing.NOTE 1The dimensions are approximate, and subject to the geometryof the valve.FIG. 1 Suggested Tube for Evaluation of Valve and Staked SealsNOTE 1The dimensions are approximate, and subject to the geometryof the valve.FIG. 2 Suggested Tube for Evaluation of Valve, and Stake

24、d andClinched SealsAerosol Liquid Phase Composition: 50 % P-11 + 50 % P-12 67%P-12+33%P-11_100 % P-12FIG. 3 Fate of Gases Seeping Through Aerosols and into a5.0-mL Eudiometer Tube Filled with WaterD3094 00 (2010)27.2 BiasTest Method D3094 has no bias because anaccepted reference or referee value is

25、not available.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of su

26、ch rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for addi

27、tional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to th

28、e ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the

29、 aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).TABLE 1 Results of Seepage TestABubble Size Actual PropellentLossNo. of Units Estimated AnnualWeight Loss4mL 7.12mL 1 2.53g5mL 8.12mL 4 2.88g6mL 9.12mL 5 3.24g7 mL 10.12 mL 2 3.59 gAActual propellent loss is Bubble Size + Soluble Gases.Soluble Gases = 0.13 mL/mL of Water 3 24 mL tube = 3.12 mL soluble gases.D3094 00 (2010)3