ASTM D968-2005e1 Standard Test Methods for Abrasion Resistance of Organic Coatings by Falling Abrasive《用落沙磨蚀法测定有机覆层耐磨性的标准试验方法》.pdf
《ASTM D968-2005e1 Standard Test Methods for Abrasion Resistance of Organic Coatings by Falling Abrasive《用落沙磨蚀法测定有机覆层耐磨性的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D968-2005e1 Standard Test Methods for Abrasion Resistance of Organic Coatings by Falling Abrasive《用落沙磨蚀法测定有机覆层耐磨性的标准试验方法》.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 968 05e1Standard Test Methods forAbrasion Resistance of Organic Coatings by FallingAbrasive1This standard is issued under the fixed designation D 968; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last
2、revision. 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.e1NOTEValue for No. 10 sieve in 14.2 was corrected ed
3、itorially in February 2007.1. Scope1.1 These test methods cover the determination of theresistance of organic coatings to abrasion produced by abrasivefalling onto coatings applied to a plane rigid surface, such as ametal or glass panel.1.2 Two test methods based on different abrasives arecovered as
4、 follows:SectionsMethod AFalling Sand Abrasion Test 1-12Method BFalling Silicon Carbide Abrasion Test 13-191.3 These methods should be restricted to testing in onlyone laboratory when numerical values are used because of thepoor reproducibility of the methods (see 13.1.2 and 21.1.2).Interlaboratory
5、agreement is improved significantly when rank-ing is used in place of numerical values.1.4 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.5 This standard does not purport to address the safetyconcerns, if any, associated wit
6、h its use. It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 823 Practices for Producing Films of Uniform Thicknessof Paint, Varni
7、sh, and Related Products on Test PanelsD 1005 Test Method for Measurement of Dry-Film Thick-ness of Organic Coatings Using MicrometersD 1186 Test Methods for Nondestructive Measurement ofDry Film Thickness of Nonmagnetic Coatings Applied toa Ferrous Base3D 1400 Test Method for Nondestructive Measure
8、ment ofDry Film Thickness of Nonconductive CoatingsApplied toa Nonferrous Metal Base3E11 Specification for Wire Cloth and Sieves for TestingPurposes2.2 Other Standards:ANSI B74.12 Specifications for the Size of AbrasiveGrain Grinding Wheels, Polishing and General Indus-trial Uses442-GB-1984-R1993 FE
9、PA Standard for bonded abrasivegrains of fused aluminum oxide and silicon carbide53. Terminology3.1 Description of Term Specific to This Standard:3.1.1 abrasion resistance, nthe amount of abrasive re-quired to wear through a unit film thickness of the coating.4. Summary of Test Methods4.1 Abrasive i
10、s allowed to fall from a specified heightthrough a guide tube onto a coated panel until the substratebecomes visible. The amount of abrasive per unit film thick-ness is reported as the abrasion resistance of the coating on thepanel. Silica sand or silicon carbide may be used, as specified.5. Signifi
11、cance and Use5.1 Silica sand produces a slower rate of abrasion fororganic coatings than that provided by silicon carbide. Forsome types of coatings, it also provides greater differentiation.5.2 The abrasion resistance scales produced by the twomethods differ, but the methods provide approximately t
12、hesame rankings of coatings for abrasion resistance.1These test methods are under the jurisdiction of ASTM Committee D01 onPaint and Related Coatings, Materials, and Applications and are the directresponsibility of Subcommittee D01.23 on Physical Properties of Applied PaintFilms.Current edition appr
13、oved Sept. 1, 2005. Published September 2005. Originallyapproved in 1948. Last previous edition approved in 2001 as D 968 93 (2001).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume inform
14、ation, refer to the standards Document Summary page onthe ASTM website.3Withdrawn.4Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.5Available from The British Abrasive Federation, Trafford Park Road, TraffordPark, Manchest
15、er M17 1JD, England.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.3 Each of the methods has been found useful for rating theabrasion resistance of specific types of coatings. For exampleMethod A (falling sand) has been used for r
16、ating floor coatingswhile Method B (falling silicon carbide) has been used forrating coatings for ship decks.METHOD AFALLING SAND ABRASION TEST66. Apparatus and Materials6.1 Abrasion Tester, as illustrated in Fig. 1 and Fig. 2.Agatefor starting the flow of abrasive is located near the top of theguid
17、e tube. It consists of a metal disk inserted into a slit in theside of the guide tube with a collar covering the slit. The guidetube shall be firmly supported in a vertical position over asuitable receptacle, which shall contain a support for holdingthe coated panel at an angle of 45 to the vertical
18、. The openingof the tube is directly above the area to be abraded and thedistance from the tube to the coated surface face at the nearestpoint is 25 mm (1 in.) when measured in the vertical direction.The base of the apparatus shall be fitted with adjusting screwsfor properly aligning the equipment.6
19、.2 Standard AbrasiveNatural silica sand from the St.Peters or Jordan sandstone deposits (located in the centralUnited States) shall be considered standard when graded asfollows after 5 min of continuous sieving.0 % retained on a No. 16 (1.18 mm) sieveMaximum 15 % retained on a No. 20 (850 m) sieveMi
20、nimum 80 % retained on a No. 30 (600 m) sieveMaximum 5 % passing a No. 30 (600 m) sieveThe sand is characterized by its roundness of grains and hasa silicon dioxide content greater than 99 %. Use the sievesdescribed in Specification E11.NOTE 1The abrading qualities of sand obtained from different so
21、urcesmay differ slightly even though the sand meets the sieve requirements.Therefore, for maximum precision of test results, purchaser and sellershould use sand from the same source.7. Test Specimens7.1 Apply uniform coatings of the material to be tested to aplane, rigid surface such as a metal or g
22、lass panel. Prepare aminimum of two coated panels for the material.7.2 Cure the coated panels under the conditions of humidityand temperature agreed upon between the purchaser and seller.NOTE 2The coatings should be applied in accordance with PracticesD 823, or as agreed upon between the purchaser a
23、nd the seller.NOTE 3The thickness of the dry coatings should be measured inaccordance with Test Methods D 1005, D 1186 or D 1400.8. Standardization8.1 Pour a quantity of standard sand into the funnel andexamine the sand stream falling from the lower end of theguide tube. Align the apparatus by means
24、 of the adjustingscrews in the base until the inner concentrated core of the sandstream falls in the center of the flow when viewed at twopositions at 90 to each other. Introduce a measured volume of6Hipkins, C. C., and Phain, R. J., “The Falling Sand Abrasion Tester,” ASTMBulletin, No. 143, Decembe
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