1、Designation: D876 13 An American National StandardStandard Test Methods forNonrigid Vinyl Chloride Polymer Tubing Used for ElectricalInsulation1This standard is issued under the fixed designation D876; the number immediately following the designation indicates the year oforiginal adoption or, in the
2、 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.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope*1.1
3、These test methods cover the testing of general-purpose(Grade A), low-temperature (Grade B), and high-temperature(Grade C)2nonrigid vinyl chloride polymer tubing, or itscopolymers with other materials, for use as electrical insula-tion. For the purpose of these test methods nonrigid tubingshall be t
4、ubing having an initial elongation in excess of 100 %at break.NOTE 1These test methods are similar but not identical to those inIEC 606842.1.2 The values stated in inch-pound units are to be regardedas standard, except for temperature, which shall be expressedin degrees Celsius. The values given in
5、parentheses aremathematical conversions to SI units that are provided forinformation only and are not considered standard.1.3 The procedures appear in the following sections:Procedure SectionASTM ReferenceStandardBrittleness Temperature 43 45 D746Corrosion Tests 74 85 D1000Dielectric Breakdown Volta
6、ge at High Humidity 65 73 E104Dielectric Breakdown Voltage 58 64 D149Dimensional Tests 8 14 D374Effect of Elevated Temperatures 25 36 D412Flammability Test 1521Oil Resistance Test 35 42 D471Penetration Test 4651Sampling 6Strain Relief Test 6873Tension Test 22 24 D412Test Conditions 7Volume Resistivi
7、ty 52 57 D2571.4 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 practices and determine the applica-bility of regulatory limitations prior to use. F
8、or specific hazardstatements, see Section 5.1.5 For fire test caveats, see Section 15.2. Referenced Documents2.1 ASTM Standards:3D149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD257 Test Methods for DC Re
9、sistance or Conductance ofInsulating MaterialsD374 Test Methods for Thickness of Solid Electrical Insu-lation (Withdrawn 2013)4D412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD471 Test Method for Rubber PropertyEffect of LiquidsD746 Test Method for Brittleness Temperature
10、 of Plasticsand Elastomers by ImpactD1000 Test Methods for Pressure-Sensitive Adhesive-Coated Tapes Used for Electrical and Electronic Applica-tionsD1711 Terminology Relating to Electrical InsulationD5032 Practice for Maintaining Constant Relative Humidityby Means of Aqueous Glycerin SolutionsE104 P
11、ractice for Maintaining Constant Relative Humidityby Means of Aqueous SolutionsE176 Terminology of Fire Standards2.2 IEC Standards:606842 Flexible insulating sleeving, Part 2, Methods oftest53. Terminology3.1 Definitions:1These test methods are under the jurisdiction of ASTM Committee D09 onElectric
12、al and Electronic Insulating Materials and are the direct responsibility ofSubcommittee D09.07 on Flexible and Rigid Insulating Materials.Current edition approved Nov. 1, 2013. Published December 2013. Originallyapproved in 1946. Last previous edition approved in 2009 as D876 09. DOI:10.1520/D0876-1
13、3.2Test methods applicable to Grade B will be specified at a later date.3For 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 AS
14、TM website.4The last approved version of this historical standard is referenced onwww.astm.org.5Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.*A Summary of Changes section appears at the end of this standardCopyright AST
15、M International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.1.1 For definitions pertaining to electrical insulation, referto Terminology D1711.3.1.2 For definitions pertaining to fire standards, refer toTerminology E176.3.2 Definitions of Terms Specific to
16、This Standard:3.2.1 brittleness temperature, nthat temperature at which50 % of the specimens fail when the specified number aretested, using the apparatus and conditions specified.3.2.2 corrosive effect, nunder the prescribed conditions,the percentage change in electrical resistance of a fine copper
17、wire in contact with the tubing.3.2.3 resistance to penetration, nthat property of tubingindicated by its resistance to high local pressures, as deter-mined by the temperature at which a steel ball punctures thetubing under the conditions of loading and temperature risespecified in these test method
18、s.3.2.4 wall thickness, nan average value determined as onehalf of the difference between the inside and outside diametersof the tubing measured by the test method prescribed herein.4. Significance and Use4.1 These test methods include most of the test methods thatare considered important to charact
19、erize nonrigid vinyl chlo-ride polymer tubing. While they were developed initially forthis type of extruded tubing, their use is not limited to this typeof tubing.4.2 Variations in these test methods or alternate contempo-rary methods are acceptable for use determine the values forthe properties in
20、this standard provided such methods ensurequality levels and measurement accuracy equal to or better thanthose prescribed herein. It is the responsibility of the organi-zations using alternate test methods to be able to demonstratethis condition. In cases of dispute, the test methods specifiedherein
21、 shall be used.NOTE 2Provision for alternate methods is necessary because of (1) thedesire to simplify procedures for specific applications without altering theresult, and (2) the desire to eliminate redundant testing and use datagenerated during manufacturing process control, including that generat
22、edunder Statistical Process Control (SPC) conditions, using equipment andmethods other than those specified herein. An example would be the useof laser micrometers or optical comparators to measure dimensions.5. Hazards5.1 Lethal voltages are a potential hazard during theperformance of this test. It
23、 is essential that the test apparatus,and all associated equipment electrically connected to it, beproperly designed and installed for safe operation. Solidlyground all electrically conductive parts which it is possible fora person to contact during the test. Provide means for use atthe completion o
24、f any test to ground any parts which were athigh voltage during the test or have the potential for acquiringan induced charge during the test or retaining a charge evenafter disconnection of the voltage source. Thoroughly instructall operators as to the correct procedures for performing testssafely.
25、 When making high voltage tests, particularly in com-pressed gas or in oil, it is possible for the energy released atbreakdown to be suffcient to result in fire, explosion, or ruptureof the test chamber. Design test equipment, test chambers, andtest specimens so as to minimize the possibility of suc
26、hoccurrences, and to eliminate the possibility of personal injury.If the potential for fire exists, have fire suppression equipmentavailable.6. Sampling6.1 Select a sufficient number of pieces of tubing in such amanner as to be representative of the shipment.6.2 Cut the number of specimens required
27、for the purpose oftests from the pieces selected in accordance with 6.1, takingcare to select material that is free from obvious defects.7. Test Conditions7.1 Unless otherwise specified in these test methods, con-duct tests at atmospheric pressure and at a temperature of 23 62C(736 4 F). Room temper
28、ature, as stated in these testmethods, shall be within this temperature range.DIMENSIONAL TESTS8. Significance and Use8.1 The inside diameter and wall thickness are of impor-tance as a measure of dimensional uniformity. They alsoprovide important data for design purposes, and are used in thecalculat
29、ion of certain physical and electrical properties of thetubing.9. Apparatus9.1 Tapered-Steel GagesUse chromium-plated gages suit-able for covering the range of tubing sizes shown in Table 1.The gages shall have a uniform taper of 0.010 in./1 in. (0.010mm/mm) of length, and shall be graduated with ci
30、rcularlathe-cut rings every 0.5 in. (13 mm) of length. The graduationsshall then represent a uniform increase in diameter of 0.005in./0.5 in. (0.010 mm/mm) of length.9.2 MicrometersUse machinists type micrometers suit-able for covering the range of tubing sizes shown in Table 1.9.3 Steel ScaleA stee
31、l scale graduated in 0.01 in. (0.25mm).10. Test Specimens10.1 Cut a 1-in. (25-mm) specimen free of kinks from thesample. Perform this operation perpendicular to the longitudi-nal axis of the tubing specimen, giving a specimen 1 in. inlength having cleanly cut square ends.11. Procedure for Measuring
32、Inside Diameter11.1 Select a gage that will fit part way into the tubularspecimen. Slip the specimen, without forcing (Note 3), over thegage until there is no visible air space between the end of thespecimen and the gage anywhere on the circumference. Con-sider this point on the gage the inside diam
33、eter of the specimen.NOTE 3When the tubing specimen tends to stick, it is acceptable todip the gage in water to facilitate slipping the specimen over the gage.However, when water is used as a lubricant on the gage, exercise sufficientcaution to ensure that the specimen is not forced on the gage, the
34、rebystretching the specimen.D876 13211.2 Determine the diameter at the point of contact betweenthe specimen and gage by referring to the nearest visiblegraduation. With the steel scale, measure any distance betweenthe edge of the specimen and the nearest graduation. Each 0.1in. (2.5 mm) on the lengt
35、h of the gage represents an increase of0.001 in. (0.025 mm) in diameter. Since the diameter at thenearest graduation is known, obtain the inside diameter of thespecimen by interpolation and report to the nearest 0.001 in.12. Procedure for Measuring Outside Diameter12.1 With the specimen located on t
36、he tapered gage asdescribed in 11.1, make three outside diameter measurementsapproximately 120 apart and adjacent to the edge of eachspecimen. Make the measurements in accordance with TestMethods D374 usingApparatus B, and observing the followingadditional details:12.1.1 Support the micrometer to al
37、low both hands to befree for manipulation.12.1.2 Measure the outside diameter adjacent to, but not onor over the cut edge, and12.1.3 Rotate the tubular specimen, which is on the taperedmandrel, so that the rotation is an oscillating motion with theoutside surface of the tube just touching the fixed
38、anvil of themicrometer. Slowly move the micrometer spindle onto thesurface of the tube until the first definite increase in theresistance to rotation of the specimen is encountered. Themicrometer reading at this time is the outside diameter of thespecimen.13. Report13.1 Report the following informat
39、ion:13.1.1 Inside diameter of the specimen to the nearest 0.001in. (0.025 mm),13.1.2 All readings on outside diameter of the specimen tothe nearest 0.001 in.,13.1.3 Average outside diameter, and13.1.4 Average wall thickness.14. Precision and Bias14.1 The precision of this test method has not been de
40、ter-mined due to inadequate voluntary participation and fundingneeded to conduct the round-robin testing. A statement of biasis unavailable in view of the lack of a standard referencematerial for this property.FLAMMABILITY TEST15. Scope15.1 This is a fire-test-response standard. The test procedurede
41、scribed measures the resistance of the tubing to ignition orthe spread of flame after ignition when tested under thespecified conditions.15.2 This standard is used to measure and describe theresponse of materials, products, or assemblies to heat andflame under controlled conditions, but does not by
42、itselfincorporate all factors required for fire hazard or fire riskassessment of the materials, products, or assemblies underactual fire conditions.15.3 Fire testing is inherently hazardous. Adequate safe-guards for personnel and property shall be employed inconducting these tests.16. Significance a
43、nd Use16.1 This is an acceptable test for use to compare tubingmade from different compounds provided that specimens withthe same dimensions are used, but it is not necessarily ameasure of the flammability of the compound.17. Apparatus17.1 Sheet Metal EnclosureA three-walled sheet metalenclosure 12
44、in. (300 mm) wide by 14 in. (360 mm) deep by 29in. (740 mm) high, open at the top. It shall be equipped withtwo parallel horizontal metal rods 16 in. (410 mm) apart, sosituated that a wire stretched perpendicularly across each rodshall be at a 70 angle with the horizontal. The lower rod shallbe appr
45、oximately 2 in. (50 mm) from the rear wall.17.2 Bare Steel WireA length of bare steel wire, approxi-mately 0.029 in. (0.74 mm) in diameter, shall be used forsupporting the specimens during the test.17.3 BurnerAburner with a38-in. (9.5-mm) nominal boreand suitable for the gas supplied. The tube of th
46、e burner shallTABLE 1 Tubing SizesSizeInside Diameter, in.AMax Min Nominal2 in. 2.070 2.000 134 in. 1.812 1.750 112 in. 1.550 1.500 114 in. 1.290 1.250 1 in. 1.036 1.000 78 in. 0.911 0.875 34 in. 0.786 0.750 58 in. 0.655 0.625 12 in. 0.524 0.500 716 in. 0.462 0.438 38 in. 0.399 0.375 516 in. 0.334 0
47、.3125 No. 0 0.347 0.325 0.330No. 1 0.311 0.289 0.294No. 2 0.278 0.258 0.263No. 3 0.249 0.229 0.234No. 4 0.224 0.204 0.208No. 5 0.198 0.182 0.186No. 6 0.178 0.162 0.166No. 7 0.158 0.144 0.148No. 8 0.141 0.129 0.133No. 9 0.124 0.114 0.118No. 10 0.112 0.102 0.106No. 11 0.101 0.091 0.095No. 12 0.089 0.0
48、81 0.085No. 14 0.072 0.064 0.066No. 16 0.061 0.051 0.053No. 18 0.049 0.040 0.042No. 20 0.039 0.032 0.034ANOTEOne inch equals 25.4 mm.D876 133be approximately 312 in. (90 mm) long above the primary inlet.It shall be mounted upon a positioning mechanism similar tothat shown in Fig. 1. As shown in the
49、figure, a pivotedpositioner which forms an extension of the center line of theburner barrel is attached to the barrel of the burner so as tolocate the exact point of impingement of the inner cone on thetest specimen. The base of the burner shall be tilted 25 fromthe horizontal during the period that the flame is applied to thespecimen, and the flame shall impinge upon the specimen at anangle of 45. The system shall contain a gas regulating valve aswell as a shutoff valve.17.4 Gas SupplyPublic utility or propane gas are a
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