Synthetic Rubber Neoprine Or Nitrite Bonded Cork Composition Sheet Grade Rc-70-C Fine Granules Size 900 Mm /- 15 Mm X 600 Mm /- 10Mm X 12 Mm Thick To Is 4253 Part Ii Of 1980. The Sheet Shall Be Duly Stamped With Mfg. Name & Date Of Mfr.In Indeligible Ink And Suitabally Packed In Transparent Polythene Bags Duly Sprinkled With French Chalk Powder.