Threads India Limited offers High Tenacity Spun Polyester Threads. Threads India Limited has been accredited with DNV IATF certificate for Management Systems and confirming to Technical Specifications as per ISO / TS 16949:2002 and meets the Satra Laboratory Accreditation Scheme for IS 199:1989, IS 767:1988. The High Tenacity Spun Polyester Threads are made from high tenacity spun polyester yarn. Also known as SAPPHIRE, the High Tenacity Spun Polyester Threads has the following key benefits: