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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Subscription pricing is determined by: This constitutes one cycle; a continuous uninterrupted back and forth motion of the roller, without lifting it from the material. If a bias is found, either its cause must be found and corrected or the asfm and the supplier must agree to interpret future test results in the light of the known bias. 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.
These test methods are not equivalent.
Last previous edition aetm in as D – 98 In the sequence in which the closure specimens were prepared, select them for testing in the tensile tester. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
Calculate the average of the values from each of the five samples. Now you are ready to begin testing. Position the clamps of the tensile tester so they are 1 6 1? The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. Create four specimens, each with a different alignment of hooks and loops. Bias—The procedure in Test Method D for measuring the peel strength of hook and loop touch fasteners has no bias because the value of the peel strength of hook and loop touch fasteners can be determined only in terms of a test method.
A number in parentheses indicates the year of last reapproval. The plate will weigh 4 pounds, so you do not need to press down, just place the plate on top of the specimens for 2 seconds and remove. The P consists of a vertical load frame, an asrm actuator, load cell, a tocuhpad test controller, XY test software and peel grips.
Preparing the Specimens
Lay specimens flat with the functional side up so that the conditioning atmosphere has free access to them. Place the free ends of the specimen to be tested in the clamps of the tester with the hook strip in the moving clamp. TestResources R5170 test software can do this for you automatically. This arrow is marked on the specimen on the leading end as it is unwound from the roll. It shall be expressed in linear units of 10 yards m. Determine the highest peak value in each portion. Precision and Bias Precision—Based on limited testing from one dd5170 using integrator averages, the within-laboratory or repeatability standard deviation is about 0.
Repeatability is dependent on the specific material being tested; some materials would be expected to be higher or lower than this. In spite of the empirical nature of the reported values, it is believed they reflect comparative performance of similar touch fasteners tested and measured in the same way.
This standard is not included in any packages. You may delete a document from your Alert Profile at any time.
Remove the outer layer of each roll before selecting the required number of strips, hook and loop, 8 in. Permission rights to photocopy the standard may also be secured from the ASTM website www. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. In the case of a dispute arising from differences in reported test results when using this test method for acceptance testing of commercial shipments, the purchaser and the supplier should conduct comparative tests to determine if there is a statistical bias between their laboratories.
The values stated in inch-pound units are to be regarded as standard. You do not need to press down, allow the roller to do d51170 work for you.
Then, again make the closure as described in 8. If the product you are testing is wider, then cut 1 inch wide strips from the middle using a TestResources Sample Cutter to minimize disruption of the hooks and loops in the product. Between-laboratory reproducibility is being determined by d51170 subcommittee.
ASTM D T Peel Strength of Hook and Loop Touch Velcro Fasteners
Without our software, you would have to identify the data visually or write a macro in Excel, therefore we recommend using our software as an easier alternative. Sampling Select the test samples so as to be as representative of the unit a shipment, a lot, and so forth as possible. Push the roller without adding weight from the end of the closure to be separated by the tensile tester over the entire length of the joined strips and then pull it back over the entire length.