ASTM D4948-1989(2016) Standard Test Method for Determination of the Upper Layer Separated from a Viscous Liquid《测定粘性液体分离的上层的标准试验方法》.pdf
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1、Designation: D4948 89 (Reapproved 2012)D4948 89 (Reapproved 2016)Standard Test Method forDetermination of the Upper Layer Separated from a ViscousLiquid1This standard is issued under the fixed designation D4948; the number immediately following the designation indicates the year oforiginal adoption
2、or, in the 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 the determination of the amount of liquid separated a
3、s an upper layer in a 24-h period from viscoussolutions or dispersions that contain dispersed solids such as paints, enamels, pigmented lacquers, adhesives, polishes, and othersimilar materials.NOTE 1The amount of clear liquid that separates during this test is one of the criteria in the United Nati
4、ons Recommendations on the Transportationof Dangerous Goods2 for the placement of flammable viscous liquids into packing groups related to flash points (See 4.1).1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.1.3 This st
5、andard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 A
6、STM Standards:3D3925 Practice for Sampling Liquid Paints and Related Pigmented Coatings3. Summary of Test Method3.1 A measured amount of the material to be tested is placed in a graduated cylinder and allowed to stand undisturbed for 24h. The volume percent of the separated top layer is then determi
7、ned.4. Significance and Use4.1 The United Nations Committee of Experts on the Transport of Dangerous Goods in their recommended regulations placematerials having a flash point below 23C (73.5F) in Packing Group II. However, if viscous substances such as paint and relatedcoatings, adhesives, polishes
8、, etc., meet certain requirements, they can be placed in Group III along with materials having a flashpoint between 23 and 60.5C (73.5 and 140F). One of the requirements is that less than 3 % of clear liquid separates from thebulk of the material when subjected to this test method.4.2 At the present
9、 time most international regulatory bodies such as the International Civil Aviation Organization (ICAO) andthe International Maritime Organization (IMO) use the U.N. Recommendations. It is anticipated that most national transportationregulatory bodies will adopt the U.N. Recommendations as their reg
10、ulations for control of transportation of hazardous materials.At present the United States permits the transshipment of hazardous materials through the United States to other countries underregulations of the IMO and ICAO.5. Apparatus5.1 Graduated Cylinder, 100-mL, TC, glass-stoppered, 295-mm total
11、height and 29-mm inside diameter.5.2 Constant Temperature Cabinet or Room, at 23 6 2C (73.5 6 3.5F).1 This test method is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.21 on Chemical Analysi
12、s of Paints and Paint Materials.Current edition approved June 1, 2012Dec. 1, 2016. Published July 2012December 2016. Originally approved in 1989. Last previous edition approved in 20062012 asD4948 - 89 (2006)D4948 89 (2012). DOI: 10.1520/D4948-89R12.10.1520/D4948-89R16.2 Transport of Dangerous Goods
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