1、Designation:F610/F610M15Standard Practice forEvaluating the Quality of Molded Poly(Vinyl Chloride)(PVC)Plastic Pipe Fittings by the Heat Reversion Technique1This standard is issued under the fixed designation F610/F610M;the number immediately following the designation indicates the yearof original a
2、doption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This practice covers a procedure for evaluating thequality of molded poly(
3、vinyl chloride)(PVC)plastic pipefittings after exposure to heat.1.2 UnitsThe values stated in either inch-pound or SIunits are to be regarded separately as standard.The valuesstated in each system may not be exact equivalents;therefore,each system shall be used independently of the other.Combin-ing
4、values from the two systems may result in non-conformance with the standard.NOTE1The values in square brackets are SI units requirements.1.3 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 esta
5、blish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Summary of Practice2.1 A representative sample of the fitting being produced isplaced in a thermostatically controlled oven at 302 6 5.4F or150 6 3C for 30 min.The acceptability o
6、f the fitting quality,after the required test time,is based or expressed as apercentage of the original wall thickness or surface area of thefitting.3.Significance and Use3.1 This practice is applicable to distinguish between prop-erly and improperly molded PVC plastic pipe fittings.It can beused to
7、:3.1.1 Determine whether cold slugs or unfused areas arepresent(Note 2),3.1.2 Determine the amount of molded-in stress producedby the molding process(Note 3),3.1.3 Reveal contamination,and3.1.4 Show the quality of the weld line.NOTE2A cold slug is a piece of material that enters the mold at asignifi
8、cantly lower temperature than the rest of the mass.NOTE3A stress-free part will generally have better properties andhigher strength than those with a high degree of stress.Stress-free partswill generally react better when exposed to chemicals.4.Apparatus4.1 Circulating Air Oven,thermostatically cont
9、rolled,ca-pable of operating at 302 6 5.4F or 150 6 3C such thatafter insertion of the fittings to be tested the test temperature isregained within 15 min or less.(See Annex A1.)NOTE4The oven should be vented to the outside of the building.5.Conditioning5.1 A specific conditioning period is not requ
10、ired althoughthe fitting shall be at room temperature.This test can beperformed on a particular fitting any time after it has beenproduced.6.Procedure6.1 Select the fittings to be tested and examine them for thefollowing,making proper notation for the report:6.1.1 The condition and appearance of bot
11、h inner and outersurfaces of the fitting,6.1.2 The condition and appearance of the weld lines andareas adjacent to them,6.1.3 The condition and appearance of the gate and areaadjacent to it,and6.1.4 The condition and appearance of the internal surfaceopposite the gate and gate area.6.2 Place the fit
12、tings to be tested in the oven so that eachfitting stands on one of its socket entrances and with sufficientseparation between individual specimens so that the hot air canflow freely between them.Record the time when the air in theoven recovers to 302 6 5.4F or 150 6 3C.After anadditional time as in
13、dicated in Table 1 at this temperature,remove the fittings,taking care not to distort or otherwisedamage them.6.2.1 When the fitting being tested has a body and branchwall that falls within two different exposure times,two fittingsshall be tested.One will be tested using the lower exposuretime,and t
14、he other will be tested using the longer exposuretime.1This practice is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.40 on TestMethods.Current edition approved March 1,2015.Published March 2015.Originallyapproved in 1979.L
15、ast previous edition approved in 2010 as F610 10.DOI:10.1520/F0610_F0610M-15.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.3 Allow the fittings to cool to room temperatu
16、re naturallyin the air.When cool enough to handle,examine them for thefollowing,making proper notation for the report:6.3.1 The condition and appearance of both inner and outersurfaces of the fitting,6.3.2 The condition and appearance of the weld lines andareas adjacent to them,6.3.3 The condition and appearance of the gate and areaadjacent to it,and6.3.4 The condition and appearance of the internal surfaceopposite the gate and gate area.7.Interpretation7.1 A suggested interpretation of the resu
