Tags STANDARD 100 by OEKO-TEX® of the US. OEKO TEX Standard 100 PVTEX supplies 1,000 tonnes of DTY yarn for market after re-operation Wednesday, Sep 12, 2018 The Petrovietnam Petrochemical and Textile Fiber JSC (PVTEX) has supplied nearly 1,000 tonnes of Drawn Textured Yarn (DTY) yarn for the market after nearly five months of re-operation of DTY yarn production lines, according to the company.