ASTM D3693-02 (R2021) pdf free download.Standard Specification for Labeled Length per Holder of Sewing Thread.
1 .1 This specification covers requirements for the labeled lengths of sewing threads of all materials.
1 .2 The values stated in SI units are to he regarded as standard. No other units of measurement are included in this standard.
4.2 For home sewing spools, the observed length of individual holders shall equal or exceed the percent of labeled length shown in Table 1.
4.3 For ready-made bobbins, the observed length of individual holders shall equal or exceed 97 % of the labeled length.
4.4 For all other holders, when the sample size is nine or fewer, the observed length of individual holders shall equal or exceed 95 % of the labeled length. For a sample size of ten or more the observed length of one holder may he less than 95 % of the labeled length.
4.5 If the initial sample consists of fewer than ten holders and the average length measured fails to conform to the requirements of 4.1 hut meets those of 4.2, 4.3, or 4.4, as appropriate, take additional specimens from the lot and test until a total of ten have been measured. Reevaluate the results of these ten specimens against the requirements of 4. 1, 4.2, 4.3, or 4.4, as appropriate. If the new average conforms with the requirements of 4.1 and the individual holders with the requirements of 4.2, 4.3, or 4.4, as appropriate, consider the lot acceptable.
4.5.1 If the original lot consists of fewer than ten holders, the supplementary sample will he one half of the holders remaining in the lot following the initial sampling.
5. Sampling
5.1 Lot—Unless otherwise agreed upon between the purchaser and supplier, a lot shall be a discrete manufacturing unit or a billed quantity of a specific color, ticket size, and length put-up of thread. A billed quantity can consist of a single unit, a carton, box, or multiple units of either, containing a number of holders of thread.
NOTE 1—An adequate specification or other agreement between the purchaser and the supplier requires taking into account variability between shipping units, between packages. or ends within shipping unit, and between specimens from a single package so as to provide a sampling plan with a meaningful producer’s risk, user’s risk, acceptable quality level, and limiting quality level.
5.2 Sample—Unless otherwise agreed upon between the purchaser and supplier, and except for ready-made bobbins, the sample, chosen at random, shall be 10 % of the holders in the lot, with a minimum of one holder, tip to a maximum often holders. The lot sample and laboratory sample are synonymous.ASTM D3693 pdf download.