Want this as a site license? Changes from the previous issue A redline edition is available for this document, with all changes visible. Ask Document Center Inc. Scope 1. The specimen geometry of this test method produces a stress concentration in a small area of the specimen. The maximum stress, usually found near the onset of tearing, is recorded as the tear resistance in newtons or pounds-force.
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You are on page 1of 4 Search inside document Standard Test Method for Tear Resistance Graves Tear of Plastic Film and Sheeting1 This standard is issued under the fixed designation D ; 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 the year of last reapproval. A superscript 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. The specimen geometry of this test rials method produces a stress concentration in a small area of the D Test Methods for Physical Dimensions of Solid specimen.
The maximum stress, usually found near the onset of Plastics Specimens tearing, is recorded as the tear resistance in newtons or E 4 Practices for Force Verification of Testing Machines pounds-force. The method is not applicable for film or E Practice for Conducting an Interlaboratory Study to sheeting material where brittle failures occur during testing or Determine the Precision of a Test Method where maximum extension is greater than Terminology 1.
Terminology D Summary of Test Method 1. The values given in parentheses are provided for of a film or sheeting specimen is measured using a constant- information only. The force necessary to initiate 1. It is the data. Significance and Use bility of regulatory limitations prior to use. The specimen geometry and speed of testing in this test method are controlled 2.
Referenced Documents to produce tearing in a small area of stress concentration at 2. Experi- D Practice for Conditioning Plastics for Testing ence has shown the test to have its best reliability for materials which do not have brittle failure or do not elongate greater than two hundred percent during testing. Current edition approved Nov. Published November Originally information for ranking the tearing resistance of plastic speci- approved in Last previous edition approved in as D Actual use performance in 2 The following reference may be of interest in connection with this test method: tearing of some plastics may not necessarily correlate with data Graves, F.
World, Vol , No. Order Adjunct No. No further reproductions authorized. D 08 5. Hence, tearing forces measured in newtons or pounds-force cannot be normalized over a wide range of specimen thickness without producing misleading data as to the actual tearing resistance of the material. Therefore, the tearing resistance is expressed in maximum newtons or Tolerance 6 0.
Table of Metric Equivalents 5. Therefore, it is advisable to refer to that 1. Table 1 of 1. Apparatus 6. The the following: accuracy of the testing machine shall be verified in accordance 6. The grips should mm 0.
The pressure exerted by the gage on minimize both slippage and uneven stress distribution. For thin films, 0. Fixed grips may be which exhibit visual deformation during measurement, a maxi- used if extreme care is taken to ensure that the test specimen is mum pressure of 70 kPa 10 psi is recommended.
For thicker inserted and clamped so that the long axis of the test specimen or stiffer films, the pressure shall be between and kPa coincides with the direction of pull through the center line of 23 and 27 psi. The 90 angle shall be honed movable member of the testing machine in such a manner that sharp with no radius or have a minimum practical radius. The they will move freely into alignment as soon as any load is cutting edge of the die shall have a 5 negative rake, and shall applied so that the long axis of the test specimen will coincide be kept sharp and free from nicks to avoid leaving ragged with the direction of the applied pull through the center line of edges on the specimen.
Wetting the surface of the sample and the grip assembly. NOTE 3The specimens should be aligned as perfectly as possible with The sample shall rest on the smooth, slightly yielding surface the direction of pull so that no rotary motion that may induce slippage will that will not damage the die blade.
Lightweight cardboard or a occur in the grips; there is a limit to the amount of misalignment piece of leather belting is suitable. Care should be taken that self-aligning grips will accommodate. NOTE 4Grips lined with thin rubber have been used successfully. In cases where specimens surfaces and that the edges have a minimum of concavity.
Test Specimens contact with the specimen. The cutting edges of member grip at a controlled velocity of 51 mm 2 in.
The testing machine shall be film. D 08 7. LLDPE HDPE No. It is obtained by pooling the standard deviations of the test results from each laboratory: and additional specimens tested, unless such failures constitute 1 a variable whose effect is being studied.
It is a mean value of all tests shall be rejected if the deviation of the pooling of the amounts by which the average of the test results for each laboratory doubtful value is more than five times the standard deviation deviate from the overall average for that material.
NOTE 6For certain materials whose properties vary considerably throughout the film or sheeting, as many as 50 specimens cut from random principal direction of orientation. Record maximum tear resis- portions of the sheet must be tested if reliable tear resistance data are tance expressed in newtons pounds-force to three significant desired.
Conditioning significant figures. However, it should less than 40 h prior to test in accordance with Procedure A of be realized that comparison between films of dissimilar thickness may not Practice D unless otherwise specified by agreement or the be valid. In cases of disagree- ment, the tolerances shall be 61C Report 3.
In cases of disagreement, the tolerances shall be 61C ing type, source, manufacturers code number, form, principal Procedure The rate of travel of the power activated grip shall be NOTE 7In this test method, resistance to tear is calculated from the In testing most plastics, this maximum load is tons pounds-force and the maximum extension in mm in.
Precision and Bias 5 devices specified in 6. Record the average thickness in microns mil. For each material, all the samples were prepared at one source, 9. Each test result was the average of ten determinations. Each laboratory obtained two test results for each material. Calculation Request RR Users of this test method should apply the principles Direction outlined in Practice E to generate data specific to their Values Expressed in Units of GramsForce laboratory and materials, or between specific laboratories.
It is obtained by pooling the standard deviations of the test results from each laboratory: be judged not equivalent if they differ by more than the r 1 value for that material. It is a sults for the same material, obtained by different operators pooling of the amounts by which the average of the test results for each laboratory using different equipment in different laboratories. The two deviate from the overall average for that material.
The data in Table 1 and Table 2 should not be this test method. Keywords representative of other lots, conditions, materials, or laborato- November 1, 1 Revised Section 8. Committee D20 has identified the location of selected changes to this standard since the last issue D - 03 that may impact the use of this standard.
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Tear Resistance ASTM D1004
You are on page 1of 4 Search inside document Standard Test Method for Tear Resistance Graves Tear of Plastic Film and Sheeting1 This standard is issued under the fixed designation D ; 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 the year of last reapproval. A superscript 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.
ASTM D-1004 Initial Tear Resistance Specimen Die
PDF veersion of ASTM D1004.pdf