1、Designation: D1929 10Standard Test Method forDetermining Ignition Temperature of Plastics1This standard is issued under the fixed designation D1929; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A numbe
2、r 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 Department of Defense.1. Scope*1.1 This fire test response test method2covers a laboratorydet
3、ermination of the flash ignition temperature and spontane-ous ignition temperature of plastics using a hot-air furnace.1.2 CautionDuring the course of combustion, gases orvapors, or both, are evolved that may be hazardous to person-nel. Adequate precautions should be taken to protect theoperator.1.3
4、 This standard is used to measure and describe theresponse of materials, products, or assemblies to heat andflame under controlled conditions, but does not by itselfincorporate all factors required for fire hazards or fire riskassessment of materials, products, or assemblies under actualfire conditi
5、ons.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 practices and determine the applica-bility of regulatory limitations prior to use. Specific p
6、recau-tionary statements are given in 1.2 and 1.3.NOTE 1This test method and ISO 871-1996 are identical in alltechnical details.2. Referenced Documents2.1 ASTM Standards:3D618 Practice for Conditioning Plastics for TestingE176 Terminology of Fire Standards2.2 International Standards:4ISO 871-1996 Pl
7、asticsDetermination of Ignition Tem-perature Using a Hot-Air FurnaceISO 5725 Precision of Test MethodsDetermination ofRepeatability and Reproducibility for Standard Test Meth-ods by Interlaboratory TestsIEC 584-2 ThermocouplesPart 2: Tolerances3. Terminology3.1 Definitions: For definitions of terms
8、relating to fire, seeTerminology E176.3.2 Definitions of Terms Specific to This Standard:3.2.1 flash ignition temperature (FIT)the minimum tem-perature at which, under specified test conditions, sufficientflammable gases are emitted to ignite momentarily uponapplication of a small external pilot fla
9、me.3.2.2 glowing combustioncombustion of a material in thesolid phase without flame but with emission of light from thecombustion zone, caused by slow decomposition and carbon-ization at various points in the specimen, without generalignition occurring.3.2.3 spontaneous ignition temperature or self-
10、ignition tem-perature (SIT)the minimum temperature at which the self-heating properties of the specimen lead to ignition or ignitionoccurs of itself, under specified test conditions, in the absenceof any additional flame ignition source.4. Significance and Use4.1 Tests made under conditions herein p
11、rescribed can be ofconsiderable value in comparing the relative ignition charac-teristics of different materials. Values obtained represent thelowest ambient air temperature that will cause ignition of thematerial under the conditions of this test. Test values areexpected to rank materials according
12、 to ignition susceptibilityunder actual use conditions.4.2 This test is not intended to be the sole criterion for firehazard. In addition to ignition temperatures, fire hazardsinclude other factors such as burning rate or flame spread,intensity of burning, fuel contribution, products of combustion,a
13、nd others.1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.30 on Thermal Proper-ties.30.03).Current edition approved Dec. 1, 2010. Published January 2011. Originallyapproved in 1962. Last previous edition approved in 20
14、01 as D1929 96(2001)1,which was withdrawn January 2010 and reinstated in December 2010.DOI:10.1520/D1929-10.In 1996, this test method was totally revised to be technically equal toISO 871-1996, and a specific air velocity is specified, which eliminates the need forapproximations.2The following refer
15、ence may be of interest in connection with this test method:Stetchkin, N. P., “A Method and Apparatus for Determining the Ignition Charac-teristics of Plastics,” Journal of Research, National Institute of Standards andTechnology, Vol 43, No. 6, December 1949 (RP 2052), p. 591.3For referenced ASTM st
16、andards, 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.4Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Flo
17、or, New York, NY 10036, http:/www.ansi.org.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5. Apparatus5.1 Hot-Air Ignition FurnaceA furnace similar to thatshown in Fi
18、g. 1, consisting primarily of an electrical heatingunit and specimen holder.5.2 Furnace TubeA vertical tube with an inside diameterof 100 6 5 mm and a length of 230 6 20 mm, made of aceramic that will withstand at least 750C. The vertical tubestands on the furnace floor, fitted with a plug for the r
19、emoval ofaccumulated residue.5.3 Inner Ceramic TubeA ceramic tube that will with-stand at least 750C, with an inside diameter of 75 6 5 mm,length of 2306 20 mm, and thickness of approximately 3 mm,placed inside the furnace tube and positioned 20 6 2mmabove the furnace floor on three small spacer blo
20、cks. The topis covered by a disk of heat-resistant material with a 25 62-mm diameter opening in the center that is used for observa-tion and passage of smoke and gases. The pilot flame is locatedimmediately above the opening.NOTE 2Fire resistant materials such as silica glass and stainless steelhave
21、 also been found suitable for this application.5.4 Air SourceAn outside air source to supply clean airnear the top of the annular space between the ceramic tubes,through a copper tube at a steady and controllable rate. Airshall be heated and circulated in the space between the twoFIG. 1 Cross Sectio
22、n of Hot-Air Ignition FurnaceD1929 102tubes and enter the inner furnace tube at the bottom. Air shallbe metered by a rotameter or other suitable device.5.5 Electrical Heating Unit, contained within the mineralfiber sleeve and constructed of 50 turns of 1.3 6 0.1 mmNichrome V alloy wire, wound around
23、 the furnace tube andembedded in heat-resistant cement.NOTE 3Other constructions such as finely coiled wire embedded inmolded ceramic fiber have also been found to be acceptable.5.6 Insulation, consisting of a layer of mineral fiber, ap-proximately 60-mm thick, and covered by a metal jacket.5.7 Pilo
24、t Igniter, consisting of a nominal 1.8 6 0.3-mminside diameter (ID) copper tubing attached to a gas supply of94 % minimum purity propane and placed horizontally 5 6 1mm above the top surface of the disk cover. The pilot flameshall be adjusted to 20 6 2 mm in length and centered abovethe opening in t
25、he disk cover.5.8 Specimen Support and HolderThe specimen pan con-sists of a metal container of approximately 0.5-mm thick steelmeasuring 406 2 mm in diameter by 15 6 2 mm in depth. Itis held in a ring of approximately 2.0-mm diameter stainlesssteel welding rod. The ring is welded to a length of the
26、 sametype of rod extending through the cover of the furnace, asshown in Fig. 1. The bottom of the specimen pan shall belocated 185 6 5 mm down from the top of the inner furnacetube.5.9 Thermocouples, 0.5-mm diameter, Chromel-Alumel(Type K) or Iron-Constantan (Type J), for temperature mea-surement co
27、nnected to a calibrated recording instrument with atolerance not exceeding 62C. The thermocouple toleranceshall be in accordance with IEC 584-2, Table 1, Class 2 orbetter.5.10 Heating ControlA suitable variable transformer oran automatic controller connected in series with the heatingcoils.5.11 Timi
28、ng Device, having an accuracy of at least 1 s.6. Location of Thermocouples6.1 Thermocouple TC1measures the temperature, T1,ofthespecimen. It is located as close as possible to the center of theupper surface of the specimen when the specimen is in placewithin the furnace. The thermocouple wire is att
29、ached to thespecimen support rod.6.2 Thermocouple TC2gives some indication of the tem-perature, T2, of the air traveling past the specimen. It is located10 6 2 mm below the center of the specimen pan. Thethermocouple wire is attached to the specimen support rod.NOTE 4Thermocouple TC2may be installed
30、 through a hole drilledadjacent to the inspection plug below the specimen pan.6.3 Thermocouple TC3measures the temperature, T3,oftheheating coil. It is located adjacent to the furnace heating coiland is used as a reference for temperature adjustment purposesbecause of its faster response.NOTE 5Therm
31、ocouple TC3may be a 1.6 6 0.1-mm diameter metallicsheathed thermocouple.7. Test Specimens7.1 Materials supplied in any form, including composites,may be used, but it is essential that the form be described fullyin the test report.NOTE 6Specimens containing high levels of inorganic fillers aredifficu
32、lt to evaluate.NOTE 7The same material tested in different forms may give differentresults.7.2 A specimen mass of 3.0 6 0.2 g shall be used formaterials having a density greater than 100 kg/m3. Materialsmay be tested in the form of pellets or powder, normallysupplied for molding. For sheet materials
33、, cut the sheet intosquares of 20 6 2by206 2 mm maximum size, and stackthese to a height that gives the required specimen mass. Forfilm materials, roll a strip 20 6 2-mm wide and of lengthsufficient to give the required specimen mass.7.3 For cellular materials having a density less than 100kg/m3, re
34、move any outer skin and cut the specimens in theform of a block measuring 20 6 2by206 2by506 5 mm.7.4 Sufficient material is required for at least two determi-nations.7.5 The test specimens shall be conditioned at 23 6 2C and50 6 5 % relative humidity for not less than 40 h prior to test,in accordan
35、ce with Practice D618.8. Procedure8.1 Flash Ignition Temperature (FIT):8.1.1 Set the air velocity to 25 mm/s by adjusting the actualair flow rate through the full section of the inner tube at thefurnace temperature, using the following formula:Qv5 6.62 3293Twhere:Qv= air flow rate, L/min, andT = tem
36、perature, K, at T2.Ensure that the air flow rate is maintained at 610 % of thecalculated value.8.1.2 Adjust the electric current supplied to the heating coilby means of the variable transformer or automatic controller,by reference to temperature T3until the air temperature, T2,remains constant at th
37、e desired initial test temperature.NOTE 8The temperature of 400C is used when no prior knowledgeof the probable flash ignition temperature range is available. Other startingtemperatures may be selected if information on the material indicates abetter choice.8.1.3 Raise the specimen pan to the cover
38、opening, andplace the specimen on the pan. Lower the pan into the furnace,ensuring that thermocouples TC1and TC2are in their correctposition (see 6.1 and 6.2). Start the timer, ignite the pilot flame,and watch for evidence of a flash or mild explosion ofcombustible gases that may be followed by cont
39、inuous burningof the specimen. Flaming or glowing combustion can also beobserved by a rapid rise in temperature T1, as compared withtemperature T2.8.1.4 At the end of 10 min, depending on whether ignitionhas or has not occurred, lower or raise the temperature T2by50C accordingly, and repeat the test
40、 with a fresh specimen.D1929 1038.1.5 When the range within which the flash ignition tem-perature lies has been determined, begin the test 10C belowthe highest temperature within this range, and continue bydropping the temperature in 10C steps until the temperature isreached at which there is no ign
41、ition during a 10 min period.8.1.6 Record the lowest air temperature, T2, at which a flashis observed, during the 10 min period, as the flash ignitiontemperature.8.2 Spontaneous Ignition Temperature (SIT):8.2.1 Follow the same procedure as described in 8.1, butwithout the pilot flame.8.2.2 Ignition
42、will be evidenced by flaming or glowingcombustion of the specimen. It may be difficult, with somematerials, to detect spontaneous ignition visually when burningis by glowing combustion rather than flaming. In such cases, arapid rise in temperature T1above that of T2accompanied by avisual observation
43、 is the more reliable reference.8.2.3 Record the lowest air temperature, T2, at which thespecimen burns, during the 10 min period, as the spontaneousignition temperature.9. Test Report9.1 Report the following information:9.1.1 Reference to this test method;9.1.2 Designation of the material, includin
44、g the name of themanufacturer and composition;9.1.3 Form of the material (granules, sheet, etc.);9.1.4 Mass of the test specimen, g;9.1.5 Density of the cellular test specimens, kg/m3;9.1.6 Flash ignition temperature (FIT), C;9.1.7 Spontaneous ignition temperature (SIT), C;9.1.8 Whether the combusti
45、on observed was flaming orglowing;9.1.9 Observations regarding the behavior of the specimenduring the test (how ignition occurred, the formation of soot orsmoke, excessive foaming, melting, bubbling, smoking, etc.);and9.1.10 The following statement:“These test results relate only to the behavior of
46、testspecimens under the particular conditions of the test. They arenot intended to be used, and shall not be used, to assess thepotential fire hazards of a material in use.”10. Precision and Bias10.1 The precision and bias of this test method is beingdeveloped internationally through ISO/TC61/Sc4. R
47、elativeprecision data based on a preliminary interlaboratory studyconducted in 1994, using ISO/DIS 871 as protocol, is indicatedin Appendix X1. Findings from this interlaboratory studyresulted in changes to the procedure; therefore, another inter-laboratory study was considered necessary and will be
48、 startedin 1996.11. Keywords11.1 flash ignition temperature; ignition temperature; spon-taneous ignition temperatureAPPENDIX(Nonmandatory Information)X1. RESULTS OBTAINED BY INTERLABORATORY TRIALSX1.1 An interlaboratory study was conducted in 1994 usingISO/DIS 871.1 protocol for the testing criteria
49、.X1.2 These precision data were determined from interlabo-ratory tests involving seven laboratories, on six polymericmaterials, with three replicates of each material. The resultingdata were analyzed in accordance with ISO 5725 and aresummarized in Table X1.1 and Table X1.2.X1.3 Repeatability, in the normal and correct operation ofthe test method, is the difference between two averages(determined from three specimens) using identical test materialand the same apparatus by one analyst within a short timeinterval. The values of repeatability will not
