ASTM D869-1985(2004) Standard Test Method for Evaluating Degree of Settling of Paint《涂漆沉降程度评价试验方法》.pdf

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1、Designation: D 869 85 (Reapproved 2004)Standard Test Method forEvaluating Degree of Settling of Paint1This standard is issued under the fixed designation D 869; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revis

2、ion. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This test method covers the determination of t

3、he degreeof pigment suspension and ease of remixing a shelf-agedsample of paint to a homogeneous condition suitable for theintended use.1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.3 This standard does not purport to a

4、ddress 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. Referenced Documents2.1 ASTM Standards:2D 1309 Test

5、 Method for Settling Properties of Traffic PaintsDuring Storage3. Significance and Use3.1 Paints, if not formulated or processed properly maysettle excessively. Paint that settles excessively is difficult toreincorporate into the paint system causing time delays orvaluable pigment being left in the

6、drum. This test method is anattempt to evaluate the degree of settling caused by theaccelerated Test Method D 1309. This very subjective methodof evaluation in conjunction with the variables of Test MethodD 1309 raises questions as to the usefulness of the results forspecification compliance.4. Appa

7、ratus4.1 Container, standard 500-mL (1-pt) friction-top can paintcontainer, 85.5 6 1.5 mm (338 6116 in.) in diameter, and 98.56 1.5 mm (378 6116 in.) in height.4.2 Spatula, weighing 45 6 1 g with square-end blade 125mm (434 in.) in length and approximately 20 mm (1316 in.) inwidth, shall be used to

8、examine the paint for pigment settlingand reincorporation characteristics.5. Procedure5.1 Place the specimen to be tested for pigment suspensionin a 500-mL (1-pt) container, filling the can to within 13 mm(12 in.) of the top. Close the can tightly and hold undisturbedfor shelf aging for 6 months or

9、for such other periods of timeagreed upon between the purchaser and the seller.5.2 Open the can holding the shelf-aged sample withoutshaking or agitation, and examine the sample without removalof supernatant vehicle. Use the spatula to determine the extentand character of portions of the paint that

10、may have separatedduring storage. Prepare a suitable spatula for this purpose bycutting the tip from an ordinary 127-mm (5-in.) flexible steellaboratory spatula to the specified length. Hold the spatulaperpendicular to and in the center area of the paint at a heightwhereby the bottom edge of the spa

11、tula is level with the top ofthe can. Drop the spatula from that position. Rate the conditionof the sample in accordance with 5.4.5.3 After examination of the entire specimen as described in5.2, if a portion of the pigment has separated out to form a firmcake at the bottom of the container pour the

12、supernatant portionof the liquid off into a clean container and hold for subsequentuse. Reincorporate the separate cake by hand stirring with thespatula, adding back the liquid in small amounts until thepigment has been reincorporated to form a homogeneous paintsuitable for the intended use or until

13、 it is determined that thepigment cake cannot be reincorporated by hand stirring. Ratethe condition of the specimen in accordance with 5.4.5.4 Rate the sample for degree of settling on a scale from 10to 0 in accordance with the following. Give intermediateconditions the appropriate odd number.Rating

14、 Description of Paint Condition10 Perfect suspension. No change from the original condition of thepaint.8 A definite feel of settling and a slight deposit brought up on spatula.No significant resistance to sidewise movement of spatula.6 Definite cake of settled pigment. Spatula drops through cake to

15、 bot-tom of container under its own weight. Definite resistance to side-wise motion of spatula. Coherent portions of cake may be re-moved on spatula.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings, Materials, and Applications and is the direct responsib

16、ility ofSubcommittee D01.44 on Traffic Coatings.Current edition approved June 1, 2004. Published June 2004. Originallyapproved in 1946. Last previous edition approved in 1998 as D 869 85 (1998).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at s

17、erviceastm.org. For Annual Book of ASTMStandards 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.Rating Description of Paint Condition4 Spatula does

18、not fall to bottom of container under its own weight.Difficult to move spatula through cake sidewise and slight edge-wise resistance. Paint can be remixed readily to a homogeneousstate.2 When spatula has been forced through the settled layer it is very dif-ficult to move spatula sidewise. Definite e

19、dgewise resistance tomovement of spatula. Paint can be remixed to a homogeneousstate.0 Very firm cake that cannot be reincorporated with the liquid to form asmooth paint by stirring manually.6. Precision and Bias6.1 PrecisionDue to the poor precision of this testmethod, if it is used in a specificat

20、ion, the maximum deviationfrom the settling limits specified should be agreed uponbetween the purchaser and the seller.6.2 BiasBias cannot be determined.7. Keywords7.1 paint settling; paint testing; settling test pigmentsuspensionASTM International takes no position respecting the validity of any pa

21、tent 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.This standard is subject to revisio

22、n 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 International Headquarters. Your com

23、ments 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 shown below.This standard is copyright

24、ed 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).D 869 85 (2004)2