Field coagulam and unsmoked sheet are the raw materials for processing ISNR. Field coagulam consists of cup lumps and tree lace removed at the time of tapping of rubber trees. These raw materials are soaked in water and passed through various machines for cleaning and drying. It is then pressed into blocks of size 690 x 330 x 150 mm, weighing 25 Kgs and packed in LDPE covers.
25 Kg blocks of ISNR are double packed in 0.03 + .01 mm thick LDPE covers with melting point below 109 degree C. Inner cover is printed with details and outer is plain. Outer cover, used for protection from dirt on transportation, is removed before use by consumers. There is colour code for each grade for package printing :