Draft Revisions, November 2014 NOT FOR …

1 Recommended Standard SpecificationForSynthetic Sewing ThreadsFor slings and Tie DownsWSTDA-TH-1 2015 Web Sling & Tie Down Association, Inc.$ Revisions, November 2014 NOT FOR PUBLICATION Web Sling & Tie Down Association. All rights reserved. No part of this publicationmay be produced, stored in a retrieval system, or transmitted, in any form or by anymeans, electronic, mechanical, photocopying, recording or otherwise, without theprior permission of the Web Sling & Tie Down Association. This publication iscirculated subject to the condition that it shall not, by way of trade or otherwise, belent, sold, hired out, or otherwise circulated without WSTDA's prior recommended standard specification has been formulated as a guide for manufacturers andusers of synthetic sewing threads for slings and tie downs.

2 The existence of this recommendedstandard specification does not however prevent members of the Web Sling & Tie DownAssociation, Inc. and other manufacturers from manufacturing or selling products not conforming tothis standardDraft Revisions, November 2014 NOT FOR PUBLICATIONWEB SLING & TIE DOWN ASSOCIATION, Laurel Bush Road, Suite 201 Bel Air, Maryland 21015 Phone (443) 640-1070 Email: Recommended Standard Specification applies to Synthetic Sewing Threads constructed from various syntheticfibers. This standard recommends construction as well as identification and testing of synthetic sewing threads usedprimarily in synthetic web slings , round slings and tie downs.

3 In addition, it gives practical advice on selection andenvironmental considerations of these synthetic sewing exclusion from this Recommended Standard Specification of synthetic sewing threads of different syntheticmaterials, and ratings is not intended to preclude their use and shall not be interpreted in this sewing threads made from materials or construction other than those detailed in this RecommendedStandard Specification shall be used in accordance with the recommendations of the thread manufacturer orqualified person. The specifications contained in this Recommended Standard Specification for Synthetic SewingThreads for slings and Tie Downs were compiled under the auspices of the Web Sling & Tie Down Association, Recommended Standard Specification is intended to assist users in specifying the proper synthetic sewingthread for their particular requirements and to serve as a guide to the industry in the construction and use ofsynthetic sewing is the paramount consideration involved in the use of any synthetic sewing thread.

4 This standard does notpurport to address all safety concerns, if any, associated with its use. It is the responsibility of the user of this standardto establish appropriate safety and health practices and determine the applicability of the regulatory limitationsprior to use. The appropriate synthetic sewing thread shall be selected by the user for their specific Published and Copyright 1999, Revised 2015 MANDATORY AND ADVISORY RULESM andatory rules of this Recommended Standard Specification are characterized by the useof the word shall. If a rule is of an advisory nature, it is indicated by the use of the word should , or is stated as a recommendation.

5 (443) 640-1031 FaxDraft Revisions, November 2014 NOT FOR PUBLICATIONTABLE OF CONTENTSC hapter And Definitions Of Synthetic Sewing ThreadsSection of Of Synthetic Sewing ThreadSection Procedures For Testing Synthetic Sewing ThreadSection of Operating PracticesSection Sewing Thread Specification TablesTable 1 Nylon Type ITwisted Soft 2 Nylon Type IITwisted Bonded 3 Polyester Type ITwisted Soft 4 Polyester Type IITwisted Bonded Revisions, November 2014 NOT FOR PUBLICATIONCHAPTER AND DEFINITIONS OF SYNTHETIC SEWING THREADSSECTION chapter provides a description of synthetic sewing threads and definitions that applyto such threads used for machine sewing of synthetic web slings , round slings and slender strand or cord designed for sewingthreads are made by plying and twisting OF TERMSA resin, rubber, foam.

6 Or adhesive for encapsulating a ply or sewingBONDING maximum load that a material can withstand while beingBREAKING STRENGTH stretched or pulled before failing or breaking (also known as tensile strength).A numbering system which expresses the weight in grams of a multi-DENIER filament yarn that is 9000 meters in length. Lower numbers represent finer sizesof filament yarn, and higher numbers represent coarser sizes of filament than normal tensile strength with a range of to gramsHIGH TENACITYper denier as compared to regular tenacity of lower than grams per yarn consisting of many continuous filaments or strands, as opposedMULTIFILAMENTto a monofilament, which is one sewing thread made with a twisted soft cord and aTWISTED BONDED MULTICORD bonding sewing thread made by twisting yarns and/or pliesTWISTED SOFT MULTICORD together to form plied yarns or Revisions.

7 November 2014 NOT FOR PUBLICATIONCHAPTER OF SYNTHETIC SEWING THREADSECTION chapter provides an outline of materials and construction characteristics ofsynthetic sewing Yarn: The yarn used in the manufacturing of the thread shall be bright, hightenacity, heat and light resistant, continuous multi-filament nylon. Nylon or Nylon 6 is Agent: The bonding agent used in Type II and Type III nylon thread shall becolorless polymer suitable to resist ply separation and enhance sewing Yarn: The yarn used in the manufacturing of the thread shall be bright, hightenacity continuous multi-filament Agent.

8 The bonding agent used in Types II &and Type III polyester thread shallbe colorless polymer suitable to resist ply separation and enhance sewing construction of the thread shall be as specified below and as specified in Tables 1through 4 in Chapter of this recommended standard for the applicable type and I twisted soft multicord thread shall be of twisted multicord (ply) construction. Eachof the individual plies shall be twisted initially with no less than the number of turns perinch (TPI) to be used in the final twist and in the opposite direction of the final twist.

9 Thefinal ply-twist shall be no less than the applicable minimum TPI as specified inTables 1& 3. Type I thread shall be unbonded with a soft II twisted bonded multicord thread shall have the same construction as Type I exceptthat it shall be shall average not more than one yarn knot per four ounces in the single shall be no final ply knots (thread knots) or joining of any kind since the put-up will be chemical finishes shall be applied except those necessary to provide goodsewing quality and as applicable for bonding (Types II).2 Draft Revisions, November 2014 NOT FOR direction for the final twist shall be Z , which is a left twist.

10 A reverse or right twistthread is known as an S twist. If S twist thread is required, this must be clearlystated, otherwise the Z twist prevails when twist is not mentioned in the otherwise specified, the thread shall be put-up on a normal weight or length perholder basis on single head plastic tubes, cardboard tubes, or cones. Each holder shallhave a label attached in such a manner as to remain in place and be clearly legible until allthread has been removed. Unless a mutual agreement between buyer and seller specifiesother requirements, the labels shall be printed with the information as specified below:Name of ManufacturerNumber SizeColorNominal Net Weight or LengthFiber and Thread yarn (fiber) and color (shade) shall be as specified in the applicable end usespecification, or purchase order.