Designation: D – 98 (Reapproved ) Standard Test Method for Peel Strength (“T” Method) of Hook and Loop Touch Fasteners1 This. ASTM D Standard Test Method for Peel Strength (“T” Method) of Hook and Loop Touch Fasteners. ASTM D – Peel Strength (T Method) of. Hook and Loop Touch Fasteners. Scope: This test measures the peel strength of 2 strips of Hook and Loop material .
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Preparing the Specimens
Create four specimens, each with a different alignment of hooks and loops. If a bias is found, awtm its cause must be found and corrected or the purchaser and the supplier must agree to interpret future test results in the light of the known bias. Select a sample consisting of four contiguous specimens as described in 8. Significance and Use This test method gives a measure of a key property of hook and loop touch fasteners which is of interest to users of such devices.
ASTM D T Peel Strength of Hook and Loop Touch Velcro Fasteners
Label each specimen with the type of alignment for later reference. This constitutes one cycle; a continuous uninterrupted back and forth motion of the roller, without lifting it from the material. The test specimens should then be randomly assigned in equal numbers to each laboratory for testing.
Already Subscribed to this document. Rated to N 50 lbf Maximum specimen thickness of 8 mm 0. Your comments will receive careful consideration at a meeting of the responsible asm committee, which you may attend.
You do not need to press down, allow the roller to do the work for you. Procedure An initial closure is made and separated to raise the loops that might have asgm compressed in packaging. It is not easy to hold the specimen exactly perpendicular in the grips while you are cranking a manual vice grip.
Each cycle should take about 2 s. This is a means of determining the resistance to separation when forces are applied normal to the line of separation of the fastener. Determine the highest peak value in d51170 portion. Between-laboratory reproducibility is being determined by the subcommittee. For materials greater than 1 in.
The average results from the two laboratories should be compared using Student’s t-test and an acceptable probability level chosen by the two parties before the testing began. The hooks and loops in the material have different orientations, but the hook and loop connection is created to connect reliably regardless of the orientation. Users of this standard are aatm advised that determination of the validity of any such patent rights, and the risk x5170 infringement of such rights, are entirely their own responsibility.
This will create two free ends to be inserted into the tensile tester. The force registered in a peel test is irregular, and as a consequence, empirical methods have had to be developed to obtain usable values related to peel strength. This standard is not included in any packages. Designed to consistently apply adhesive films and sheets to testing surfaces Floating roller removes any pressure variance by the human astk Roller weight of 2.
Rated to 1 kN lbf Maximum specimen thicknesses from 10 mm to 50 mm 0. In spite of the empirical nature of the reported values, it is believed they reflect comparative performance of s5170 touch fasteners tested and measured in the same way.
This standard is also available to be included in Standards Subscriptions. Select from the four specimens of hook and loop, the first zstm to be tested and referring to Fig. The four specimens of hook and loop selected will be used to characterize the peel d51770 of each of the configurations. Prepare the second closure specimen as described in 8.
Apparatus Roller—consisting of a smooth steel surface, approximately 43? These types pneumatic grips are also helpful in getting the specimen well-aligned in the grips due to the foot activator giving you both hands free to hold the specimen. Have a question about conducting the test for this standard?
Your specimens should be 1 inch wide and 8 inches long. Make sure to stick your specimens together using a steel plate as a weight. For faster testing results we offer our G Pneumatic Grips. Now use a TestResources 4. Proceed to Checkout Continue Shopping. Calculate the average of these five highest values for each of the four specimens. Prepare the third closure specimen as described in 8.
We are confident that we have what you are looking for. Simple design can d170 used for a multitude of tensile applications Inexpensive and reliable. Place the two halves of the hook and loop fastener sheets together and place the steel plate which should be 8 inches long and 1.
Permission rights to photocopy the standard may also be secured from the ASTM website www. Your Alert Profile lists the documents that will be monitored. Calculate the average of the integrator values from the four closures representing the four directions.
Our engineers are familiar with the ASTM D test procedure and can guide satm through the process and help you choose the best equipment.
A jagged line having multiple peaks will be produced. The peel plot will be an important aspect of data retrieval and therefore we highly recommend our XyPlot software.