1、Designation: D7393 16Standard Practice forIndicating Oil in Abrasives1This standard is issued under the fixed designation D7393; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses ind
2、icates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice is used to determine the presence of oil inabrasives used for abrasive blast cleaning.1.2 The procedure can be used in the laboratory, field, blas
3、tand paint shop or steel fabrication shop.1.3 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of
4、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:2D4940 Test Method for Conductimetric Analysis of WaterSoluble Ionic Contamination of Blast Cleaning Abras
5、ives2.2 SSPC Standards:3SSPC-AB 1 Mineral and Slag AbrasivesSSPC-AB 2 Cleanliness of Recycled Ferrous Metallic Abra-siveSSPC-AB 3 Ferrous Metallic AbrasiveSSPC-AB 4 Recyclable Encapsulated Abrasive Media3. Summary of Practice3.1 A sample of the abrasive is placed in a container,covered with water an
6、d vigorously shaken. The presence of anoil sheen or oil drops on the surface is cause for rejection of thesupply of abrasive being tested.4. Significance and Use4.1 Oil in abrasives can be transferred to the surface beingcleaned, thus contaminating it. This can cause film defects,affect adhesion of
7、the coating applied over it, and the ultimateperformance of the coating system.4.2 Oil in abrasives is one of the cleanliness tests requiredfor mineral and slag abrasives in SSPC-AB 1, for recycledferrous abrasives in SSPC-AB 2, for new ferrous abrasives inSSPC-AB 3, and for recyclable encapsulated
8、abrasive media inSSPC-AB 4.4.3 Other contaminants in abrasive such as chemical con-taminants or particulate matter require other methods fordetection such as Test Method D4940 for conductive-potential,ionic contaminants. Because Test Method D4940 specifies adifferent ratio of abrasive to water and r
9、equires the use ofhigher purity water, the solution resulting from the evaluationof the oil in abrasive shall not be used for the evaluation inaccordance with Test Method D4940.5. Apparatus and Materials5.1 ContainerClear jar or bottle capable of holding 250ml (8.5 fl oz) or more and with a lid that
10、 is capable of sealingthe contents.5.2 WaterPotable.6. Procedure6.1 Place a sample of the abrasive in a clean container toabout half its height.6.2 Add water to a level at least 2.5 cm (1 in.) above the topof the abrasive. The water temperature shall be between 20 and35C (68 and 95F).6.3 Cover the c
11、ontainer and shake vigorously for one min.6.4 Remove the cover from the container and let it sit for upto 5 min.6.5 Examine the surface of the water for oil droplets or oilsheen.6.6 If oil is visually evident the abrasive fails the test. Retestthe abrasive after cleaning or discard the contaminated
12、abrasivesupply.1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.46 on Industrial Protective Coatings.Current edition approved July 1, 2016. Published August 2016. Originallyapp
13、roved in 2007. Last previous edition approved in 2012 as D7073 07 (2012).DOI: 10.1520/D7393-16.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Documen
14、t Summary page onthe ASTM website.3Available from Society for Protective Coatings (SSPC), 800 Trumbull Drive,Pittsburgh, PA 15205, http:/www.sspc.org.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States17. Testing Frequency7.1 The testing
15、frequency shall be agreed to by the pur-chaser and seller. A suggested testing frequency is:7.1.1 Three tests per shipment for bulk delivery.7.1.2 One test per 50 bags for bag delivery, or one test if thedelivery is less than 50 bags.7.1.3 One sample per shift on days that blast cleaning isperformed
16、 for recycled abrasive.8. Interpretation of Results8.1 The presence of an oil sheen or oil droplets indicatescontamination. The abrasive should be cleaned before use ordiscarded.9. Report9.1 Report the abrasive manufacturer, brand name of theproduct, size designation, lot/batch number, and test resu
17、lts.10. Keywords10.1 abrasive; contaminants; oil contaminationASTM 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
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