ASTM D5793-2018 pdf free download

ASTM D5793-2018 pdf free download.Standard Test Method for Binding Sites per Unit Length or Width of Pile Yarn Floor Coverings
1. Scope
1.1 This test method describes the measurement of the number of binding sites per unit length or width of machine- made, woven, knitted, and tufted pile yarn floor covering both before and after adhesive backing application. 1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 For definitions terms relating to Pile Floor Coverings, D13.21, refer to Terminology D5684. 3.1.1 The following terms are relevant to this standard: back coating, backing, backing fabric, binding site, buried pile yarn, carpet, components, finished, finished pile yarn floor covering, floor covering, lengthwise direction, needles per unit width, pile, pile heights, pile yarn floor covering, pile yarn mass, pitch, stitches, stubble, textile floor covering, tuft, tufted fabric, widthwise direction. 3.2 For all other terminology related to textiles, refer to Terminology D123.
4. Summary of Test Method
4.1 The length of pile floor covering containing 40 binding sites is measured in either the lengthwise or widthwise direc- tion as required and the number of binding sites per unit length is calculated.
5. Significance and Use
5.1 This test method is useful in quality and cost control during manufacture. Both appearance and performance of pile yarn floor coverings can be affected by the number of binding sites per length and width. 5.2 This test method is considered satisfactory for accep- tance testing of commercial shipments because current esti- mates of between-laboratory precision are acceptable and the method is used extensively in the trade for acceptance testing. 5.2.1 If there are differences of practical significance be- tween reported test results for two laboratories (or more), comparative tests should be performed to determine if there is statistical bias between them using competent statistical assis- tance. As a minimum, use test samples for such comparative tests that are as homogeneous as possible, drawn form the same lot of material as the samples that resulted in the disparate results during initial testing, and that are randomly assigned in equal numbers to each laboratory for testing. The test results from the 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 for that material must be adjusted in consideration of the know bias.
7. Sampling Units and Test Specimens
7.1 Sampling Units: 7.1.1 Uncoated Floor Covering—The basic sampling unit of uncoated floor covering is a production roll. 7.1.2 Coated Floor Covering—The basic sampling unit of coated floor covering is a shipping roll. The number of shipping rolls obtained from each production roll ranges from one to over ten. 7.2 Take a lot sample as directed in Practice E122 when statistical knowledge of the product variability and test method precision is available, and decision has been made on the maximum deviation that can be tolerated between the estimate to be made from the sample and the result that would be obtained by measuring every sampling unit of the lot. Other- wise the number of sampling units in a lot sample and the use of the test results obtained from the individual test samples shall be in accordance with the manufacturer’s quality control program or with the specification agreed to by the purchaser and the supplier.