1、Designation: E2680 091Standard Test Method forAppearance of Clear, Transparent Liquids (Visual InspectionProcedure)1This standard is issued under the fixed designation E2680; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year
2、 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.1NOTESection 4 was corrected editorially in December 2011.1. Scope1.1 This test method describes the visual assessment of thea
3、ppearance of clear, transparent liquids for clarity and thepresence of undesirable components (contamination) such assuspended matter, free water (or oil) and particulates whenexamined by transmitted light. Measurements requiring instru-mentation are not included in this method. This test methodwas
4、originally designed for application to glycols and methanolwall washes of marine vessels but may be applicable to otherclear transparent liquids.1.1.1 This method can be used as a field test at storagetemperatures or as a laboratory test at room temperatures.1.1.2 This method provides a rapid pass/f
5、ail test for clarityand contamination of clear, transparent liquids. It is a qualita-tive assessment only.1.2 Review the current appropriate Material Safety DataSheets (MSDS) for detailed information concerning toxicity,first aid procedures, and safety precautions.1.3 The values stated in SI units a
6、re to be regarded asstandard. No other units of measurement are included in thisstandard.1.4 This standard does not purport to address 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 practice
7、s and determine the applica-bility of regulatory limitations prior to use. Specific hazardsstatements are given in the section on Hazards, Section 8.2. Referenced Documents2.1 ASTM Standards:2D4176 Test Method for Free Water and Particulate Con-tamination in Distillate Fuels (Visual Inspection Proce
8、-dures)E300 Practice for Sampling Industrial Chemicals3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 appearance, nthe visual perception of a clear, trans-parent liquid.3.1.2 clear and bright (also referred to as clean and bright),na condition in which the liquid is free of ha
9、ze, particulatesor suspended matter particles.3.1.2.1 cleara condition in which the liquid contains novisible contaminants (not more than the maximum allowednumber of suspended matter particles no greater than 1 mm indiameter or particulates of sufficient size to be easily noted).3.1.2.2 brighta con
10、dition in which the liquid is transpar-ent with no haze or visible fee water (or free oil) in organic (oraqueous) liquids.3.1.3 free water (or free oil), nwater or oil in excess tothat soluble in the liquid at ambient temperature which mayappear as haze, cloudiness, droplets or a water or oil layer
11、in anorganic sample.3.1.3.1 DiscussionFor aqueous samples, the determina-tion of free oil is equally important and may have an appear-ance similar to that of free water or oil in organic samples.3.1.4 haze or cloudiness, nis a scatter of light from anaccumulation of tiny suspended particles in the l
12、iquid.3.1.4.1 DiscussionCloudiness is considered synonymouswith haze. Quantification of haze requiring instrumentation isout of the scope of this standard.3.1.5 particulates, nany foreign material in the liquid thatfloats or settles to the bottom of the sample bottle.3.1.5.1 DiscussionThese particul
13、ates may be small solidor semi-solid particles, sometimes referred to as silt or sedi-ment and may be the result of contamination by dust, corro-sion, protective coating deterioration or product instability.3.1.6 suspended matter particles, nany foreign materialthat is in suspension in the liquid (d
14、oes not float or sink) and isinsoluble or separated matter.1This test method is under the jurisdiction of ASTM Committee E15 onIndustrial and Specialty Chemicals and is the direct responsibility of SubcommitteeE15.02 on Product Standards.Current edition approved April 1, 2009. Published April 2009.
15、DOI: 10.1520/E2680-09E01.2For 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 Document Summary page onthe ASTM website.1Copyright ASTM International, 100 B
16、arr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.1.6.1 DiscussionThis usually refers to things like filterfibers, droplets, lint from materials used to dry compartments,prior cargo material or fine pieces of tank or vessel coating.3.1.7 transparent, nliquid is translu
17、cent to transmittedlight.4. Summary of Test Method4.1 An amount of liquid sample at storage or room tempera-ture is visually examined for clarity and presence of contami-nants. The sample is collected in a transparent glass containerand held against a bright, transmitted light to examine forclarity,
18、 suspended matter, haze and the presence of free water(or oil) and subsequently swirled to create a vortex to detect thepresence of particulate matter. For different categories ofglycols, the number of recommended maximum allowed sus-pended matter particles to qualify for a pass is defined. (Table1)
19、. For other clear, transparent liquids, other numbers may bedefined (for example, on the relevant product specifications).5. Significance and Use5.1 This method provides a pass/fail test for appearance ofclear, transparent liquids. Many liquid organic products have aproduct specification requiring t
20、hem to be clear and bright andfree of visible particulate matter and of liquid phases other thanthe main liquid. Producers of these liquid organic productsneed a test method to confirm the quality of their productsmeets product specifications for appearance. Appearance is amanufacturing and sales sp
21、ecification test for ethylene glycolproducts and a loading specification test for methanol wallwashes of marine vessels. This test method was originallydesigned for application to glycols and methanol wall washesof marine vessels, but may be applicable to other clear,transparent liquids. Individuals
22、 using this test method for otherclear transparent liquids should assure themselves that themethod is sufficient for use.5.2 There are many factors that could affect the appearanceduring and after sampling of a liquid product. These factorsmay include transferring of the liquid into a different samp
23、lecontainer, contamination by the sample container or contami-nation by ambient atmosphere. Sampling and evaluation pro-cedures need to be followed to avoid undesirable effects andassure the appearance of the sample is typical for the liquid asmanufactured.6. Interferences6.1 The sample containers m
24、ust be clean and free of dust orother particulates.6.2 If an attempt is made to test the appearance of a liquidthat is darker than a color rating of 5 on the ASTM Color scale(Test Method D4176) or 60 Pt-Co units, the presence of freewater (or oil) or particulates could be obscured and missed bythe a
25、nalyst.7. Apparatus7.1 Sample Container, clear glass with a screw cap (notcontaining a gasket) capable of holding sample volumes of upto 1 L. The volume of the sample tested should be inaccordance with the requirements of the product specification.Typical volumes are 250, 500 and 1000 mL. It is reco
26、mmendedto use a wide neck bottle with a diameter of approximately 10cm. The volume of the container should be large enough for therecommended volume of liquid to fill the container not morethan 75% full to allow for space to swirl the sample withoutspilling. Sample containers should be checked for c
27、leanlinesssince they are a likely source of contamination. It is recom-mended to use only new bottles.7.2 Temperature Sensing Device (TSD), capable of monitor-ing the observed test temperature to within an accuracy of60.5C for laboratory tests that require measurements to bemade at a specific temper
28、ature (product specifications).7.3 Temperature-Controlled Bath, of suitable dimensionsand capable of controlling the sample container temperaturewithin 60.5C of the desired temperature for laboratory teststhat require measurements to be made at a specific temperature(product specifications).8. Hazar
29、ds8.1 Each analyst must be acquainted with the potentialhazards of the equipment, reagents, products, solvents andprocedures before beginning laboratory work. Sources ofinformation include: operation manuals, MSDS, literature, andother related data. Safety information should be requested fromthe sup
30、plier. Disposal of waste materials, reagents, reactants,and solvents must be in compliance with laws and regulationsfrom all applicable governmental agencies.8.2 Ethylene glycol products are intended for industrial useonly. Before handling or using these products, read the currentMSDS for each produ
31、ct (8.1).8.3 The following hazards are associated with the applica-tion of this test method.8.3.1 Chemical Hazard:8.3.1.1 Methanol is a flammable and toxic solvent. Metha-nol is absorbed through the skin and by breathing the vapors.Be careful when handling a flammable solvent and work in awell-venti
32、lated area away from sources of ignition. Use theproper Personal Protective Equipment to minimize exposure.8.3.1.2 Flammable liquids (General); see warning statementin A1.1.9. Sampling9.1 Follow the relevant instructions for sampling of liquidsas given in Practice E300.9.2 It is recommended that a s
33、ample be taken from theprocess stream, storage tank or vessel in a clear-glass samplebottle (7.1) and examined for visual appearance as soon aspossible after sampling.9.3 Do not sub-sample or transfer the sample to a secondcontainer, unless the original sample was not contained in aTABLE 1 Recommend
34、ed Maximum Number of SuspendedParticles Allowed for a Sample to PassSample TypeRecommended Numberof Particles AllowedTypical SampleVolume (mL)Ethylene Glycol 0 6 500Diethylene Glycol 0 6 500Triethylene Glycol 0 6 500Tetraethylene Glycol 0 6 500Methanol Wall Wash 0 20 400E2680 0912clear-glass sample
35、bottle or delivered in a volume too large tolift for visual inspection.9.4 If the sample is delivered in a volume too large to lift,homogenize the sample before sub-sampling. When sub-sampling, do not fill the container to the top. Fill the containerapproximately 75 % full to allow enough space to s
36、wirl thesample without spilling.10. Procedure10.1 Allow the sample to equilibrate to room temperature(or to the storage temperature or the temperature at which thesample is used) prior to visual inspection. A temperature-controlled water bath can be used to bring the sample to thedesired temperature
37、 if measurements must be made at aspecific temperature according to product specifications.10.2 When using a water bath, replace the sample contain-ers cap with an airtight closure through which a calibratedtemperature-sensing device is immersed in the sample. Peri-odically agitate the sample in a m
38、anner sufficient to homog-enize the bulk of the sample. Remove the sample containerfrom the water bath and wipe dry. Remove the temperature-sensing device and replace the original cap before proceedingwith the visual inspection.10.3 Hold the sample up to a bright light source and visuallyexamine the
39、 sample at arms length for clarity, suspendedmatter (any foreign matter that does not float or settle to thebottom of the bottle) and any free water (or oil) droplets orlayers.10.4 Swirl the sample gently to form a vortex and avoidformation of bubbles. Examine the bottom of the vortex atarms length
40、for particulate matter (any foreign material thatsettles to the bottom of the bottle) and free water (or oil).10.5 Record the visual clarity as “Clear and Bright” if notmore than the maximum allowed number of suspended matterparticles no greater than 1 mm in diameter and no free water(or oil) were f
41、ound or as “Not Clear and Bright” if the numberand size of the particles exceed the maximum allowed greaterthan 1 mm in diameter or free water (or oil) is found.10.6 Record if particulate matter (of sufficient size andquantity to be easily noted) was or was not viewed at thebottom of the vortex.11.
42、Report11.1 Report the appearance as “Pass” if the visual claritywas found to be “Clear and Bright” with no more than themaximum number of particles of suspended matter no greaterthan 1 mm in diameter and no free water (or oil) were foundand the particulate matter had no particulates of sufficient si
43、zeand quantity to be easily noted at the bottom of the vortex.11.2 Report the appearance as “Fail” if the visual clarity wasfound to be “Not Clear and Bright” with more than themaximum number of particles of suspended matter greater than1 mm in diameter and/or free water (or oil) were found and/orpa
44、rticulate matter was found with particulates of sufficient sizeand quantity to be easily noted at the bottom of the vortex.12. Precision and Bias12.1 No information is presented about either the precisionor bias of Test Method E2680 since the test result is nonquan-titative.13. Keywords13.1 appearan
45、ce; cleanliness; free oil; free water; particulatecontamination; suspended matter; visual inspectionANNEX(Mandatory Information)A1. WARNING STATEMENTA1.1 Flammable Liquid (General)Warning Flammable.Keep away from heat, sparks, and open flame.Keep container closed.Use only with adequate ventilation.A
46、void prolonged breathing of vapor or spray mist.Avoid prolonged or repeated contact with skin.Spillage and fire instructions will depend on nature of liquid.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standar
47、d. 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 revision at any time by the responsible technical committee and must be reviewed
48、 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 comments will receive careful consideration at a meeting of theresponsible t
49、echnical 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 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 we
