1、Designation:C151115Standard Test Method forDetermining the Water Retention(Repellency)Characteristics of Fibrous Glass Insulation(Aircraft Type)1This standard is issued under the fixed designation C1511;the number immediately following the designation indicates the year oforiginal adoption or,in the
2、 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 a laboratory procedure forevaluating the water absorption potential o
3、f blanket insulationfor aircraft,thereby providing a measure of potential weightincrease due to water retention in an aircraft.1.2 The water repellency(or retention)characteristics ofmaterials can be affected by conditions such as contaminationor temperature of the water.Values obtained as a result
4、of thistest method does not adequately describe the water repellencycharacteristics of materials subject to these conditions.1.3 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for informati
5、on 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-priate safety and health practices and determine the applica-bility of regulatory limi
6、tations prior to use.2.Referenced Documents2.1 ASTM Standards:2C168 Terminology Relating to Thermal InsulationC390 Practice for Sampling and Acceptance of ThermalInsulation LotsC800 Specification for Fibrous Glass Blanket Insulation(Aircraft Type)E691 Practice for Conducting an Interlaboratory Study
7、 toDetermine the Precision of a Test Method3.Terminology3.1 DefinitionsTerminology C168 shall be considered asapplying to the terms used in this specification.4.Summary of Test Method4.1 The insulation is weighed then submerged in de-ionized(or distilled)water for 15 min;it is drained for 60 s andre
8、weighed.The amount of water retained is the difference inspecimen weights and is expressed in grams.5.Significance and Use5.1 The water retention of the insulation can result in anincrease in weight and a resultant potential degradation in theproperties of the insulation.6.Apparatus6.1 The water rep
9、ellency test apparatus is shown in Fig.1.6.2 Scale,accurate to 0.1 g.7.Sampling,Test Specimens,and Test Units7.1 Three specimens shall be tested,taken from across thewidth of a representative package.Sampling techniques shallbe in accordance with Practice C390.7.2 The specimens shall be 10-by 10-in.
10、(254-by 254-mm)by full sample thickness;samples shall be no thicker than 4-in.(100-mm)7.3 The insulation shall be tested without facing or jacket-ing.8.Conditioning8.1 No conditioning of the specimen is required.9.Procedure9.1 Weigh each specimen to the nearest 0.1 g.9.2 Float each specimen on the s
11、urface of a vat of de-ionized(or distilled)water at 70 6 4F(21 6 2C).Lay a0.25-in.(6.4-mm)mesh rigid screen on top of each specimenand slowly submerge it to a level that is 5 in.(127 mm)belowthe surface of the water.Fix the screen in position as shown inFig.1.After 15 6 1 min,release the screen and
12、raise thespecimens slowly until they float.Remove the screen.Gripeach specimen on one corner with a spring clamp and hang itin a vertical position for 60 6 5 s.Reweigh each specimen andrecord.1This test method is under the jurisdiction ofASTM Committee C16 on ThermalInsulation and is the direct resp
13、onsibility of Subcommittee C16.33 on InsulationFinishes and Moisture.Current edition approved March 1,2015.Published June 2015.Originallyapproved in 2001.Last previous edition approved in 2009 as C1511 04(2009).DOI:10.1520/C1511-15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,o
14、rcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 10.Calculation or Interp
15、retation of Results10.1 Determine water retained by each specimen by sub-tracting the original specimen weight from the final specimenweight.Calculate water repellency by averaging the results ofthe three specimens.11.Report11.1 The report shall include the following:11.2 Name and any additional ide
16、ntification of the materialtested,11.3 Thickness of the material,11.4 Number of specimens tests,and11.5 Average weight gain of the specimens.12.Precision and Bias12.1 Interlaboratory Test ProgramAn interlaboratorycomparison was run in which randomly selected test specimensof one material were tested for water repellency.Four labora-tories participated,with each laboratory testing three speci-mens.Practice E691 was followed for the design and analysisof the data.All of the test specimens were pro