ASTM D2062-03(R2021) pdf free download

ASTM D2062-03(R2021) pdf free download.Standard Test Methods for Operability of Zippers
4. Significance and Use
4.1 The significance of specific tests is discussed in the appropriate sections. 4.2 These test methods are considered satisfactory for ac- ceptance testing of commercial shipments of zippers because the methods have been used extensively in the trade for this purpose, even though current estimates of between-laboratory precision are quite large in some cases. 4.2.1 If there are differences of practical significance be- tween reported test results for two laboratories (or more), comparative test should be performed to determine if there is a statistical bias between them, using competent statistical assis- tance. As a 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. The test results from the two laboratories should be compared using a statistical test for unpaired data, at a probability level chosen prior to the testing series. 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. 4.3 The method(s) in the standard along with those in Test Methods D2051, D2052, D2053, D2054, D2057, D2058, D2059/D2059M, D2060, and D2061 are a collection of proven test methods. They can be used as aids in the evaluation of zippers without the need for a thorough knowledge of zippers. 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 proper- ties 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no practical methods have yet been developed or because a valid evaluation of the informa- tion resulting from existing unpublished methods requires an intimate and thorough knowledge of zippers.
5. Apparatus
5.1 Force Indicator 3 (Fig. 1)—A 50 N or 10 lbf capacity force indicator equipped with a direct-reading dial graduated in 0.5 N or 0.1 lbf divisions, a maximum-reading indicator, and a clamp suitable for attaching the zipper tape ends to the indicator. 5.2 Spacer—A piece of metal designed to fit in the pin cavity of the fixed retainer ofthe specimen and having a length equal to the element pitch of the specimen. 5.3 Hooks, suitable for attaching the force indicator to the slider pull of a specimen.
6. Sampling
6.1 Lot Sample—As a lot sample for acceptance testing, take at random the number of individual containers from each shipping carton as directed in an applicable material specifi- cation or other agreement between the purchaser and the supplier. Consider individual containers from each shipping carton to be the primary sampling units. N OTE 1—An adequate specification or other agreement between the purchaser and supplier requires taking into account the variability between shipping cartons and between zippers in a container to provide a sampling plan with a meaningful producer’s risk, consumer’s risk, acceptable quality level, and limiting quality level. 6.2 Laboratory Sample and Test Specimens—As a labora- tory sample for acceptance testing, take a number of zippers specified in Section 6 at random from each container in the lot sample. Consider the zippers as both the laboratory sample and the test specimens.