Standard Test Method For De Ection Temperature Of Plastics-Books Pdf

Standard Test Method for De ection Temperature of Plastics
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NOTE 3 A round robin has been conducted that showed that there is no 6 4 Results of testing may be affected by the design of the. advantage to using higher loads when measuring deflection temperature of test equipment The test span either 100 mm or 101 6 mm. present day plastics with present day instruments, will influence the resultant measurement Instrumentation. 5 Significance and Use equipped with metal clips or other types of auxiliary supports. designed to maintain specimens perpendicular to the applied. 5 1 This test is particularly suited to control and develop. load may affect the test results if the pressure is sufficient to. ment work Data obtained by this test method may not be used. restrict the downward motion of the specimen at its center. to predict the behavior of plastic materials at elevated tempera. tures except in applications in which the factors of time. temperature method of loading and fiber stress are similar to 7 Apparatus. those specified in this test method The data are not intended 7 1 The apparatus shall be constructed essentially as shown. for use in design or predicting endurance at elevated tempera in Fig 1 and shall consist of the following. tures 7 1 1 Specimen Supports metal supports allowing the load. to be applied on top of the specimen vertically and midway. 6 Interferences, between the supports which shall be separated by a distance. 6 1 The results of the test may depend on the rate of heat defined in 7 1 1 1 or 7 1 1 2 The contact edges of the supports. transfer between the fluid and the specimen and the thermal and of the piece by which load is applied shall be rounded to. conductivity of the fluid a radius of 3 6 0 2 mm 0 118 6 0 008 in. 6 2 The results of this test may depend on the measured. 7 1 1 1 Method A 101 6 6 0 5 mm 4 0 6 0 02 in, width and depth of the specimen and the final deflection at. which the deflection temperature is determined 7 1 1 2 Method B 100 0 6 0 5 mm 3 937 6 0 020 in. 6 3 The type of mold and the molding process used to 7 1 2 Immersion Bath A suitable liquid heat transfer me. produce test specimens affects the results obtained in this test dium Note 4 in which the specimen shall be immersed It. Molding conditions shall be in accordance with the standard shall be well stirred during the test and shall be provided with. for that material or shall be agreed upon by the cooperating a means of raising the temperature at a uniform rate of 2 6. laboratories 0 2 C min This heating rate shall be considered to be met if. FIG 1 Apparatus for Deflection Temperature Test, Copyright by ASTM Int l all rights reserved Tue Dec 4 03 01 58 EST 2007. Downloaded printed by, Dalian Univ of Technology pursuant to License Agreement No further reproductions authorized.
over every 5 min interval during the test the temperature of the measurement range and whether the gauge is contaminated and sticking. bath shall rise 10 6 1 C at each specimen location 7 1 5 Temperature Measurement System. NOTE 4 A liquid heat transfer medium shall be chosen which will not 7 1 5 1 Digital Indicating System Consisting of a thermo. affect the specimen Mineral oil is considered safe from ignition to 115 C couple resistance thermometer RTD and so forth as the. Silicone oils may be heated to about 260 C for short periods of time For sensor together with associated conditioning conversion and. still higher temperatures special heat transfer media should be used readout instrumentation adequate to cover the range being. Improved performance with longer oil life may be obtained by the use of. tested The sensor and related electronics shall be accurate to at. CO2 or other inert gas to isolate the oil surface from the atmosphere. NOTE 5 A circulating air oven may be used if it can be shown that. least 60 5 C Thermocouples shall comply with the require. equivalent results are obtained ments of Specification E 608 E 608M Resistance thermom. eters shall comply with the requirements of Specification. 7 1 3 Deflection Measurement Device suitable for measur E 1137 E 1137M. ing specimen deflection of at least 0 25 mm 0 010 in It shall 7 1 5 2 Thermometer Older systems still in existence use a. be readable to 0 01 mm 0 0005 in or better The device may thermometer for temperature measurement at each individual. be a dial gauge or any other indicating or recording device test station The thermometer shall be one of the following or. including electric displacement sensing apparatus its equivalent as prescribed in Specification E 1 Thermometer. 7 1 4 Weights A set of weights of suitable sizes so that the 1C or 2C having ranges from 20 to 150 C or 5 to 300 C. specimen can be loaded to a fiber stress of 0 455 MPa 66 psi respectively whichever temperature range is most suitable. 6 2 5 or 1 82 MPa 264 psi 6 2 5 The mass of the rod Liquid in glass thermometers shall be calibrated for the depth. that applies the testing force shall be determined and included of immersion in accordance with Test Method E 77. as part of the total load If a dial gauge is used the force 7 2 Micrometers shall meet the requirements of Test Meth. exerted by its spring shall be determined and shall be included ods D 5947 and be calibrated in accordance with that test. as part of the load Note 7 Calculate the testing force and the method. mass that must be added to achieve the desired stress as. follows 8 Sampling, F 5 2Sbd2 3L 1 8 1 Unless otherwise specified sampling shall be in accor. F1 5 F 9 80665 dance with the sampling procedure prescribed in Practice. mw 5 F Fs 9 80665 mr, D 1898 Adequate statistical sampling shall be considered an. acceptable alternative,F load N 9 Test Specimen, F1 load kgf 9 1 At least two test specimens shall be used to test each. S fiber stress in the specimen 0 455 MPa or 1 82, sample at each fiber stress The specimen shall be 127 mm 5. in in length 13 mm 1 2 in in depth by any width from 3 mm. b width of specimen mm, d depth of specimen mm 1 8 in to 13 mm 1 2 in Tolerances on dimensions for highly.
L distance between supports 101 6 mm Method A reproducible work should be of the order of 60 13 mm 0 005. or 100 mm Method B see 7 1 1 1 and 7 1 1 2 in over the length of the specimen. mw added mass kg NOTE 7 The test results obtained on specimens approaching 13 mm in. Fs force exerted by any spring loaded component in width may be 2 to 4 C above those obtained from 4 mm or narrower test. volved N this is a positive value if the thrust of the specimens because of poor heat transfer through the specimen. spring is towards the test specimen downwards or 9 2 The specimens shall have smooth flat surfaces free from. a negative value if the thrust of the spring is opposing saw cuts excessive sink marks or flash. the descent of the rod or zero if no such component 9 3 Molding conditions shall be in accordance with the. is involved and specification for that material or shall be agreed upon by the. mr mass of the rod that applies the testing force to the. cooperating laboratories Discrepancies in test results due to. specimen kg, variations in molding conditions may be minimized by anneal. NOTE 6 In some designs of this apparatus the spring force of the dial ing the test specimens before the test Since different materials. gauge is directed upward opposite the direction of specimen loading require different annealing conditions annealing procedures. which reduces the net force applied to the specimen In other designs the shall be employed only if required by the material standard or. spring force of the dial gauge acts downward in the direction of specimen. if agreed upon by the cooperating laboratories, loading which increases the net force applies to the specimen The mass. applied to the loading rod must be adjusted accordingly increased for. upward dial force and decreased for downward dial force to compensate 10 Preparation of Apparatus. Since the force exerted by the spring in certain dial gauges varies 10 1 The apparatus shall be arranged so that the deflection. considerably over the stroke this force should be measured in that part of of the specimen at midspan is measured by the deflection. the stroke that is to be used Suggested procedures to determine the total. load required to correct for the force of the dial gauge spring are given in. measurement device described in 7 1 3 The apparatus may be. Appendix X1 and Appendix X2 Other procedures may be used if arranged to shut off the heat automatically and sound an alarm. equivalent results are obtained Appendix X3 provides a method of or record the temperature when the specific deflection has been. determining the spring force uniformity of the force in the gauge s test reached Sufficient heat transfer liquid shall be used to cover. Copyright by ASTM Int l all rights reserved Tue Dec 4 03 01 58 EST 2007. Downloaded printed by, Dalian Univ of Technology pursuant to License Agreement No further reproductions authorized. the thermometers to the point specified in their calibration or particular material under test no error is introduced by starting. 76 mm 3 in in the case of the ASTM thermometers referred at a higher temperature. to in 7 1 5 12 5 Carefully apply the loaded rod to the specimen and. lower the assembly into the bath, NOTE 8 It is desirable to have a means to cool the bath in order to. reduce the time required to lower the temperature of the bath after the test 12 6 Adjust the load so that the desired stress of 0 455 MPa. has been completed This may be accomplished by using a cooling coil 66 psi or 1 82 MPa 264 psi is obtained. installed in the bath or an external heat transfer system that passes the hot NOTE 11 Verification of the load should be made on all new equip. oil through it If the rate of temperature rise of the oil is adversely affected ment after replacement of dial gauges or following any other change that. by the presence of residual coolant in the coils the coolant should be could affect the loading Verification of the load should also be performed. purged prior to starting the next test periodically to ensure that the equipment is within calibration see. Appendix X1 Appendix X2 and Appendix X3 Depending on the type of. 11 Conditioning deflection measurement device used it may be necessary to adjust the. 11 1 Conditioning Condition the test specimens at 23 6 device such that it records the deflection in the displacement range of the. 2 C 73 4 6 3 6 F and 50 6 5 relative humidity for not less device where the test is to be made. than 40 h prior to test in accordance with Procedure A of 12 7 Five minutes after applying the load adjust the deflec. Practice D 618 unless otherwise specified in the material tion measurement device to zero or record its starting position. standard or contract between interested parties In cases of Heat the liquid heat transfer medium at a rate of 2 0 6. disagreement the tolerances shall be 61 C 1 8 F and 62 0 2 C min. relative humidity, NOTE 12 The 5 min waiting period is provided to compensate par.
NOTE 9 Shorter conditioning periods may be used when it is shown tially for the creep exhibited by some materials at room temperature when. that they do not affect the results of this test Longer conditioning times subjected to the specified nominal surface stress That part of the creep. may be required for some materials that continue to change with time that occurs in the initial 5 min is usually a significant fraction of that which. occurs in the first 30 min, 12 Procedure 12 8 Record the temperature of the liquid heat transfer. 12 1 Measure the width and depth of each specimen with a medium at which the specimen has deflected the specified. suitable micrometer as described in 7 2 at several points amount at the specified fiber stress. along the span Average these respective readings to obtain the NOTE 13 Continuous reading of the deflection versus temperature. nominal width and depth value for the specimen These values even beyond the standard deflection might be useful in special situations. are used to determine the amount of applied force necessary to. produce the specified fiber stress in each specimen see 7 1 4 13 Report. 12 2 Position the test specimens edgewise in the apparatus 13 1 Report the following information. and ensure that they are properly aligned on the supports so 13 1 1 Full identification of the material tested. that the direction of the testing force is perpendicular to the 13 1 2 Method of test specimen preparation. direction of the molding flow If the specimen support unit has 13 1 3 Conditioning procedure. metal clips or auxiliary supports on it to hold the specimen 13 1 4 Test method reported as D 648 Method A or D 648. perpendicular to the load and to prevent the specimen from Method B. being displaced by the circulating oil only one surface of the 13 1 5 The width and depth of the specimen measured to. clip or auxiliary support may touch the specimen at any one 0 025 mm. time The presence of any clip or auxiliary support shall not 13 1 6 The standard deflection the deflection temperature. impede the deflection of the specimen or place additional force and the resultant maximum fiber stress for each specimen. on the specimen that will result in more load having to be 13 1 7 The immersion medium the temperature at the start. applied to achieve deflection of the test and the actual heating rate. 13 1 8 Average deflection temperature, NOTE 10 Holding of the specimens upright on the specimen supports. by the use of clips or auxiliary supports that apply pres. Standard Test Method for De ection Temperature of Plastics Under Flexural Load in the Edgewise Position1 This standard is issued under the xed designation D 648 the number immediately following the designation indicates the year of original adoption or in the case of revision the year of last revision A number in parentheses indicates

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