Tenders for Supply of Synthetic Rubber Nitrile Bonded Cork Com Synthetic Rubber Nitrile Bonded Cork Composition Sheet Grade Rc70-A Type C Fine Granules Size 900 Mm +/- 15 Mm X 600 Mm +/- 10 Mm X 4.8 Mm Thick Conforming To Is 4253 Part 2 : 2008 Amendment No. 1 October 2010. The Sheets Shall Be Duly Stamped With Manufacturer S Name & Date Of Manufacture In Indelible Ink And Suitably Packed In Transparent Polythene Bags Duly Sprinkled With Chalk Powder Individually..