This standard is issued under the fixed designation D ; the 1 These test methods are under the jurisdiction of ASTM Committee D13 on. Buy ASTM D Standard Test Methods for Strength Tests for Zippers from SAI Global. ASTM D Standard Test Methods for Strength Tests for Zippers.
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Significance and Use 4. No one test determines the suitability of a zipper for a specific end use. Since the tests are inter-related more than one may be needed for a complete evaluation. A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. All methods are not suitable for use with all aztm of zipper.
The restrictions, if any, are indicated in the scope for each individual test method. The test methods appear as follows: No one test determines the suitability of a zipper for a speci? As atm minimum, the test samples should be used that are as homogeneous as possible, that are drawn from the material from which the disparate test results were obtained, and that are randomly assigned in equal numbers to each laboratory for testing.
Other materials with established test values may be used for this purpose. D061 test results from the two e2061 should be compared using a statistical test for unpaired data, asttm 1.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Current edition approved Jan. Originally approved in Last previous edition approved in as D — If a bias is found, either its cause must be found and corrected, or future test results must be adjusted in consideration of the known bias.
They can be used as aids in the evaluation of zippers without the need for a thorough knowledge of zippers.
ASTM D2061 Zipper strength Testing Equipment
The enumerated test methods do not provide for the evaluation of all zipper properties. Besides those properties measured by means of the enumerated test methods there are other properties that may be important for the satisfactory performance of a zipper. Test methods for measuring those properties have not been published either because no practical methods have yet been developed or because a valid evaluation of the information resulting from existing unpublished methods requires an intimate and thorough knowledge of zippers.
Consider individual containers from each shipping carton to be the primary sampling units. NOTE 1—An adequate speci? Number of Specimens 6. Determine the number of zippers per individual container as follows: Consider the zippers as both the laboratory sample and the test specimens.
Instead, specify the number of specimens shown in Table 1. This number of specimens is calculated using values of v which are somewhat larger values of v than are usually found in practice. When a reliable estimate of v for the users laboratory becomes available, Eq 1 will usually specify fewer than the number of specimens shown in Table 1. Chain crosswise strength Element pull-off Element slippage, lengthwise Holding strength of stops: Top stop, holding Bottom stop holding, slider Bottom stop holding, crosswise Bottom stop holding, stringer separation Bridge top stop, stringer separation Holding strength of separable units: Separable pin Fixed retainer Separating unit—crosswise Slider de?
B No standard number of specimens is given for these tests since they are quite variable and are not recommended for acceptance testing except where the laboratories of the purchaser and the seller have established their precision and bias, if any.
The methods to which these instructions apply are as follows: Preconditioning is not required for zippers other than those made of nylon.
Summary of Test Method If preferred, the use of a CRT tensile testing machine is permitted. Consequently, the two machines cannot be used interchangeably.
In case of controversy, the CRE method shall prevail. The front jaws shall be The ends of the front jaws shall be at least 25 mm 1 in. Apply an increasing load until the elements pull off the bead, until the c2061 separates, or until failure of some other kind occurs.
ASTM D – 93() Standard Test Methods for Strength Tests for Zippers
2d061 the nature astk the failure and the breaking load to the nearest 2. Secure the stringer in the bottom clamp of the testing machine as described in Apply an increasing load until the element is pulled off or other failure occurs. Record the nature of the failure and the load at failure to the nearest 0.
Separate the chain into stringers and hold a stringer so the elements are positioned as in Fig. Remove the second element from the top of the stringer, taking care not to damage the bead. Cut through the bead and the tape in the width direction below the? The tape and bead may be cut either partially or completely across as long as the element to be tested is not hindered in its movement along the bead. Cut the tape with sharp scissors, d2016 or nippers using single stroke, ignoring blooming if it occurs.
The element to be tested is the one just below the element that was removed. Secure the element slippage? Secure the stringer in the lower clamp of the testing machine in vertical alignment, positioning the clamps approximately 76 mm 3 in.
Apply an increasing load until the element slips off the end of the cut bead or until asstm failure occurs. Describe the material or product sampled and the dd2061 of sampling used. Precision and Bias Each laboratory used two operators to test each material. All 64 specimens of each material came from the same sample. The components of variance expressed as coefficients of variation, calculated as percentage of the average were: NOTE 3—The tabulated values of the d2016 differences should be considered to be a general statement particularly with respect to betweenlaboratory precision.
Before a meaningful statement can be made about two speci? Position the slider body at the point where normally checked in its free movement by the stop or stops to be tested. Secure the zipper in the lower clamp of the testing machine as illustrated in Fig. The distance between the top edge of the lower clamp and mouth of the slider shall be approximately 76 mm r2061 in.
Apply an astn load until the stop or stops pull off, until the tape breaks, or until failure of some other kind occurs. Record the nature of the failure and the load at failure to the nearest 2. Position the slider at the point FIG.
Apply the load until the stop pulls apart, until the tape breaks, or until failure of some other kind occurs. In the case of the entering type bottom stop, position the slider at the point where normally checked in its free movement. Set the opposing clamps of the testing machine approximately 76 mm 3 in.
Secure the stringers in the upper and lower clamps of the testing machine with the slider body positioned along the axis of the clamps and midway between them as shown in Fig. Apply an increasing load until the stop pulls off, until the tape breaks, or until failure of some other kind occurs. Record the nature of the failure and load at failure to the nearest 2. Position the stop along the axis of the clamps and midway between them as shown in Fig.
Secure the two stringers in the lower clamp of the testing machine as illustrated in Fig. The angle included between the stringers shall be such as to prevent the catching of elements on the? The distance between the top edge of the lower clamp and the nearest surface of the slider body shall be approximately 76 mm 3 in. Open the chain by pulling the stringer apart all the way to the bottom stop. From both stringers remove the elements adjacent to but not under the bottom stop for a distance of approximately 13 mm 1?
Secure the tapes of the zipper in the clamps of the testing machine with the edges of the jaws parallel to and approximately 3 mm 1? Summary of Test Methods Secure the separable pin? Then seat the separable pin on the? With a distance of approximately 76 mm 3 in. The components of variance expressed as coefficients of variation, percent relative, were calculated to be: Apply an increasing load until the separable pin pulls off, until the tape breaks, or until failure of some other kind occurs.
Separate the two stringers and position the? Apply an increasing load until the retainer pulls off, until the tape breaks, or until failure of some other kind occurs. Position the separating unit so that the exposed end of the separable pin is aligned with the sides of the front jaws as shown in Fig. The components of The specimen is laid on the pad and a load applied.
The effects of operability of the zipper is then determined.
D20661 platens shall be hardened steel, 51 by 51 by 25 mm 2 by 2 by 1 in. The lower platen shall have attached to its entire surface a piece of neoprene rubber 6 mm 1? The compression testing machine shall be designed to permit the application of a load to the platens at a rate-of-traverse of approximately 13 mm 1?
The load shall be measurable in increments of 44 N 10 lbf. Two specimens are required. Place the pull in the normal?