1、Designation: C 1574 04Standard Guide forDetermining Blown Density of Pneumatically Applied Loose-Fill Mineral Fiber Thermal Insulation1This standard is issued under the fixed designation C 1574; the number immediately following the designation indicates the year oforiginal adoption or, in the case o
2、f revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This guide describes two alternate procedures for deter-mining blown density at a predetermin
3、ed thickness or a rangeof thicknesses expected in field applications of mineral fiberloose-fill insulation.1.2 This guide involves blowing a sample of loose-fillinsulation into a test frame of known volume, measuring theweight of the insulation captured and calculating the blowndensity.1.3 This guid
4、e is intended for pneumatically-applied loose-fill mineral fiber insulation designed for use in horizontal openattic spaces.1.4 This guide is intended for product design and productauditing by manufacturers of loose-fill insulation. This guide isadaptable as a plant quality control procedure.1.5 Thi
5、s guide does not predict the aged density of themineral fiber loose-fill insulation.1.6 This standard does not purport to address all the safetyconcerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and to d
6、etermine the applicability of regula-tory limitations prior to use.1.7 The values stated in inch-pound units are to be regardedas the standard. The SI unit values given in parentheses areapproximate and are provided for information only.2. Referenced Documents2.1 ASTM Standards:2C 168 Terminology Re
7、lating to Thermal InsulationC 1374 Test Method for Determination of Installed Thick-ness of Pneumatically Applied Loose-Fill Building Insula-tion3. Terminology3.1 DefinitionsTerminology C 168 is applicable to theterms used in this standard.3.2 Definitions of Terms Specific to This Standard:3.2.1 Var
8、iable blown densitychange in density exhibitedby loose-fill insulation as a function of thickness.3.2.1.1 DiscussionSome loose-fill insulation materials ex-hibit an increase in blown density when thickness increases.Also, the original thickness may or may not decrease with timeresulting in the same
9、or somewhat higher densities. Thisthickness vs density relationship should be considered whendeveloping coverage information for the bag label.4. Significance and Use4.1 Blown density is used to develop loose-fill coveragecharts. Data for blown density vs thickness is used in thedevelpoment of a var
10、iable blown density presentation forloose-fill insulation.4.2 Thermal resistance (and conductivity) of loose-fill min-eral fiber insulation depends on density, thickness. The result-ing blown density data is useful in developing an expressionfor apparent thermal conductivity as a function of density
11、. Thiswill in turn aid the manufacturer in developing coverageinformation for packages of loose-fill insulation.4.3 The blown density obtained in this method is for thethickness of the test only. The relationship of blown densitywith thickness can be determined by repeating the proceduresoutlined he
12、re using different thicknesses.4.4 These procedures are not the same as the test methoddescribed in Test Method C1374. Depending on the testconditions utilized, the blown density may, or may not,represent the installed density values obtained by using TestMethod C 1374.4.5 This guide can be used to
13、develop appropriate blowingmachine settings to achieve a target blown density at apredetermined thickness.5. Summary of Guide5.1 A standardized test chamber of fixed volume is used tocollect the pneumatically-applied insulation.1This guide is under the jurisdiction of ASTM Committee C16 on ThermalIn
14、sulation and is the direct responsibility of Subcommittee C16.32 on MechanicalProperties.Current edition approved Sept. 1, 2004. Published October 2004.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMSta
15、ndards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.2 There are two types of test chambers that are in commonuse:5.2.1 Procedure A uses a moveab
16、le test box having aminimum volume of 20 cubic feet (0.56 m3) . The blownmaterial is weighed while still in the test box and the density iscalculated.5.2.2 Procedure B uses a fixed frame assembly in a testroom or blowing shack to simulate an attic application. Theblown material is removed from the t
17、est frame and weighedseparately to calculate the density.5.3 After the insulation is blown into the chamber, theweight of the insulation is determined.5.4 From the volume of the sample and its weight, theblown density is determined.6. Apparatus6.1 Blowing Machinea commercial pneumatic blowingmachine
18、, designed for handling mineral fiber loose-fill insula-tion materials, shall be used for blowing the insulation into thetest chamber. This machine shall have throughput and handlingcharacteristics similar to that used in field applications.6.2 Blowing Hosethe machine shall utilize three (3) 50 ft(1
19、5 m) sections to make up 150 ft (46 m) of a minimum of 3in. (76 mm) diameter flexible corrugated blowing hose. At least100 ft. (30 m) of the hose shall be elevated between 10 and 20ft (3 and 6 m) above the blowing machine to simulate a typicalinstallation configuration. The hose shall have no more t
20、haneight 90-degree bends and no bends may be less than 4 ft (1.2m) radius. After 50 h of usage, the last 50 ft (15 m) section atthe discharge end shall be discarded. A new 50 ft (15 m) shallbe attached directly to the blowing wool machine. The remain-ing 100 ft (30 m) shall then be attached to the e
21、nd of the newhose. This creates a hose replacement rotation.6.3 Scalesplatform scales or load cells accurate to 1 %.6.4 Specimen Preparation Rooman enclosed area wherethe test material is to be blown into the test chamber. This areais required to protect the blowing operation from wind orstrong air
22、currents. Room geometry should provide adequateclearance around the test chamber and large enough not toinfluence the blowing stream from the hose.6.5 Hose Nozzle Standa hose stand on swivel casters thatholds the blowing hose at a fixed height of 36 to 48 in. (0.9 to1.2 m) and is on a swivel that al
23、lows the operator to swing thehose horizontally back and forth while slowly moving back-wards and forwards to fill the test chamber. A typical hosenozzle stand is shown in Fig. 1. Use of the hose stand isoptional.6.6 Moveable Test Chamber (Procedure A)a woodenopen container to collect the insulation
24、. The chamber shallhave a minimum capacity of 20 ft3(0.57 m3) and have theminimum inside dimensions of 11 in. high by 28 in. wide by 80in. long (279 mm by 711 mm by 2032 mm). Note that theseminimum dimensions by themselves do not produce therequired volume but simply represent the minimum B, C, andF
25、IG. 1 Hose Nozzle StandC1574042D dimensions in Fig. 2. The front of the test chamber istypically angled at 45 degrees to insure proper filling as theoperator moves back during the filling operation. A typical testchamber is shown in Fig. 2.6.7 Fixed Test Chamber (Procedure B)joists are built upon a
26、plywood floor to simulate an open attic structure.Typically 2 in. by 10 in. (50 mm by 254 mm) joists, 16 in. (406mm) on center, are used to create three sections that are 19 ftlong (5.8 m). The joists are marked along their length at 6 in.(152 mm) intervals so that the total insulation volume can be
27、determined after the blowing is completed. A typical testchamber is shown in Fig. 3.6.8 Compressed air supply, hose, and nozzle.6.9 Straight edged screed.7. Procedure7.1 Procedure AMoveable Test Chamber7.1.1 Within the sample preparation area, position the emptyand clean test chamber on the scale an
28、d so that the test chamberis approximately centered side to side and from front to back.7.1.2 Tare the scale/load cells.7.1.3 Affix the appropriate blowing hose to the blowingmachine and, if used, secure the exit hose end in the hosenozzle stand.7.1.4 Set the blowing machine with the desired gear, g
29、ateopening, and air pressure settings required to obtain the blowninsulation conditioning that is representative of a field blownapplication.7.1.5 Load the appropriate amount of loose-fill in theblowing machine hopper.FIG. 2 Movable Test Chamber Procedure AFIG. 3 Fixed Test Chamber Procedure BC15740
30、437.1.6 Start the blowing machine and direct the hose andmaterial flow to the side away from the test chamber. Check thepressure gage on the blowing machine to make sure the correctair pressure exists.7.1.7 If blowing by hand, position the end portion of theblowing hose horizontal to the floor at al
31、l times and at aminimum of 3 ft (0.9 m) and a maximum of 4 ft (1.2m) abovethe floor of the test chamber.7.1.8 When the insulation is flowing smoothly (about 10-20s) begin filling the test chamber. Fill the test chamber fromback to front using a slow sweeping motion from side to sideoverlapping all s
32、ides of the test chamber by at least one foot.7.1.9 Slowly and uniformly move backwards and forwardsto uniformly fill the chamber and capture the most representa-tive stream of blown material.7.1.10 When the chamber is full, direct the hose away andstop the machine.7.1.11 Remove by broom or air any
33、insulation that is on thefloor and touching the test chamber or the scale/ load cells sothe proper weight of test insulation will be obtained.7.1.12 Using compressed air, carefully move along the sideof the chamber blowing the high insulation area away toachieve a level surface.7.1.13 Using a straig
34、ht edged screed, start in the middle ofthe test chamber and work to each end carefully, so theinsulation is not compressed, screeding the insulation surfacelevel to the top of the test chamber.7.1.14 Record the weight of the insulation in the testchamber to the nearest 0.05 lb (0.02 kg).7.1.15 Calcu
35、late the blown density by dividing the insula-tion weight by the volume of the test chamber.7.2 Procedure B Fixed Test Chamber7.2.1 Make sure the test frame is empty and clean. Thenfollow steps 7.1.3-7.1.10 from the procedure above.7.2.2 Starting at the back of the joist cavities, use a straightedge
36、d screed to level the insulation to the top of the joists.Avoid raking, packing, or pushing the insulation down.7.2.3 Using the screed, cut off all insulation in each of thethree cavities beyond the marks where the cavities are notfilled. Separate this material from the leveled material. Forexample,
37、 when the insulation completely fills the 8.75 in. (212mm) cavity created by the 2 310 lumber framework afterleveling, separate and discard the material beyond the last markwhere the filling has occurred.7.2.4 Count and record the number of 6 in. (152 mm) cavitylengths filled with insulation.7.2.5 C
38、ollect and weigh the insulation to the nearest 0.05 lb(0.02 kg) from the filled cavities.7.2.6 Calculate the volume of insulation using Eq 1.Vol 5N 3 Length 3 Width 3 HeightConversion(1)Where:Vol = Volume (ft3or m3)N = Number of cavity spaces filledLength = Separation length of cavity space marks (i
39、n.or mm)Width = Width of cavity space between joists (in. ormm)Height = Height of the joists (in. or mm)Conversion = Units conversion (1728 IP or 10+9SI)7.2.7 Calculate the blown density in lb/ft3(kg/m3) by divid-ing the weight from 7.2.5 by the volume determined in 7.2.6.8. Report8.1 Report the fol
40、lowing information:8.1.1 Test location, date, time, and operator.8.1.2 Temperature and relative humidity.8.1.3 Product identification with manufacturer, productname, date of manufacture (if available), and bag weight.8.1.4 Product preconditioning, if any.8.1.5 Blowing machine type and settings.8.1.6
41、 Test chamber dimensions and volume.8.1.7 Procedure used.8.1.8 Insulation weight.8.1.9 Blown density.9. Precision and Bias9.1 PrecisionThe following repeatability values havebeen determined for this guide.9.1.1 The repeatability standard deviation has been deter-mined at one laboratory to be 0.01 lb
42、/ft3(0.16 kg/m3) for anaverage density of 0.44 lb/ft3(7.0 kg/m3) when testing a lightdensity, unbonded mineral fiber loose-fill insulation usingProcedure A methodology.9.1.2 The repeatability standard deviation has been deter-mined at one laboratory to be 0.02lb/ft3(0.32 kg/m3) for anaverage density
43、 of 0.60 lb/ft3(9.6 kg/m3) when testing a lightdensity, unbonded mineral fiber loose-fill insulation usingProcedure B methodology.9.1.3 BiasNo information can be presented on the bias ofthe procedures in this guide for measuring the blown density ofloose-fill insulation because no standardized mater
44、ial is avail-able that has an accepted reference value.9.1.4 The results of the laboratory study of the test repeat-ability can be found in ASTM Research Report RR:C16-10273.9.1.5 There has not been an interlaboratory testing programto establish the presision for either Procedure A or ProcedureB. Wh
45、en data is available this section will be revised.10. Keywords10.1 blown density; loose-fill; mineral fiber; thermalinsulation3Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:C16-1027 .C1574044ASTM International takes no position
46、 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 such rights, are entirely their own responsibility.T
47、his 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 additional standardsand should be addressed to ASTM In
48、ternational 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 the ASTM Committee on Standards, at the address show
49、n 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 aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).C1574045
