This standard is issued under the fixed designation D ; the number 1 This test method is under the jurisdiction of ASTM Committee D on Textiles. Jan 1, Buy ASTM D R TEST METHOD FOR TEARING STRENGTH OF FABRICS BY FALLING-PENDULUM (ELMENDORF-TYPE). The ASTM D Elmendorf based tear test is the most popular test for measuring the tearing strength of most fabrics. The Elmendorf test testing machine uses.
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For most fabrics this time period will be about 1 h. Qstm are confident that we have what you are looking for. If zero is not registered, adjust the pointer stop until the zero reading is obtained.
ASTM D Tearing Strength of Fabrics by Falling-Pendulum Type (Elmendorf) Apparatus
The calibrated mass shall be constructed such that the mass can be inserted in the clamps in the same manner as used for a fabric specimen. In asstm event, it is recommended that computer-processed data be veri? Last previous edition approved in as D —07a. It is not suited for the course direction of warp knit fabrics or either direction of most other knitted fabrics.
When the pendulum comes to rest, the positioning line at the center of the pendulum should be directly above the edge of the pendulum stop. Statistical assistance is recommended for the investigation of bias. NOTE 6—Some instruments may require different calculations than percentage of scale. Label to maintain specimen identity. In the absence of such an agreement, take the number of fabric rolls or pieces speci?
As a minimum, the two parties should take a group of test specimens that are as homogeneous as possible and that are from a lot of fabric of the type in question. The Online Industrial Exhibition. Before a meaningful statement can be made about two speci? The falling pendulum propagates this pre-notch to a complete tear through the center of the fabric specimen. Labthink provides COF Tester for coef. The pointer, or when equipped, the digital readout should read 50 6 0.
Place the gage in the stationary specimen clamp in the usual manner for testing fabric. The test specimens should then be randomly assigned in equal numbers to each laboratory for testing. Apply a small amount of graphite from an ordinary lead pencil to the cutting knife or the edge of the die used for cutting the slit so that when the cut is made some of the graphite transfers to the paper; this serves to contrast the cut from the uncut portion of the paper and facilitates the measurement.
Record the scale reading required to completely tear ast, test specimen. Open the catalog to page 2.
If the pointer friction does not lie between two and three divisions, remove the pointer, wipe the bearing clean, and apply a trace of clock oil to the groove of the bearing. The strength of these tears must be designed and manufactured carefully to prevent the tears from extending excessively, thereby degrading the style look. Otherwise, discard the specimen and replace with another one.
If a smooth release cannot be obtained by this adjustment the pendulum or the pendulum stop may require repair or replacement. This standard has been approved for use by agencies of the Department astmm Defense. Vacuum Leak Tester for bottles for food, chemical and pharmaceutical applications.
Preferably the clamps may be air actuated, but manual clamping is permitted. Work Item s – proposed revisions of this standard. Instructions are provided for testing specimens with, or without, wetting. Preparation of Apparatus and Calibration 8. Verify this by holding down the pendulum stop and allowing the pendulum to swing free.
It is not suited for the course direction of warp knit fabrics or either direction of most other knitted fabrics. The components of variance for Elmendorf tear strength expressed as standard deviations were calculated to be the values listed in Table 3.
ASTM D1424 Tearing Strength of Fabrics by Falling-Pendulum Type (Elmendorf) Apparatus
Apparatus is commercially available. D — 09 When specimens are to be tested wet, cut from areas adjacent to the dry test specimens. Catch the pendulum just after the threshold of its backward swing and return it to its locked starting position. Replace the asfm when it no longer can be adjusted to the gage, or optionally. Visually check the alignment of the clamps.
For rolls of fabric, take a sample that will exclude fabric from the outer wrap of the roll or the inner wrap around the core of the roll of fabric. Ensure the gage is positioned with the wide dimension upwards and the projection extending over the edge of the stationary clamp far asttm such that the knife can be adjusted 6 to the bottom edge of the gage.
Movement of the instrument during the swinging of the pendulum is a signi? Make this measurement either with a precision steel rule graduated in 0.
The direction of orientation of the fabric should be noted in the test report. The test specimens should then be randomly assigned in equal numbers to each laboratory for testing. Two operators in each laboratory each tested eight specimens of each fabric using Test Method D Ensure the mirrored divisions of the scale are clean axtm free of any foreign matter.
This requires quantification of the tearing strength of the fabric in the test lab. Labthink RT rub tester to test on flexo printing. Either die provides the basic rectangular test specimen 6 2 mm 4 6 0. Generally the bulk of the calibrated mass faces downward. If zero is not registered, the pointer stop should be adjusted until the zero reading is obtained, otherwise service as directed in Annex A1. Tensile Tester for both compression and tensile, with loads typically N.