Process: Plantation Rubber coagulum (Cup lump/Tree Lace/Latex Coagulum) obtained from Hevea Brasiliensis Tree, and processed by pre cleaning, cutting, creeping, shredding, drying, pressing and packing.

Processing of natural rubber into blocks similar to synthetic rubbers adopting cost effective and modern processing methods is a notable improvement in the presentation of dry natural rubber from India. This is in line with the consumer preference in the world rubber market for Technically Specified Rubber, which has the following advantages:

• Technically certified rather than visually graded as in the case of RSS and crepe grades of natural rubber.
• Consistency in quality
• Compact packaging
• Low contamination in handling and transportation

Weight and Size

Natural rubber in block form (crumb) is pressed into bales of rectangular shape with weight and dimensions specified as after 700mm x 360mm x 140mm and weight 25 kg or 35 kg or 33.33 kg +-0.5%

Properties of ISNR 20 Natural Rubber

PARAMETERS	Unit	Min	Max	TEST METHOD
Specific Gravity	0.92 (Typical)
Dirt Content @ 325 mesh (% by mass)	%	-	0.20	IS 3660 (Part 1) 1999 ASTM D 1278
Ash Content @ 550 oC (% by mass)	%	-	1.00	IS 3660 (Part 3) 1988 ASTM D 1278
Volatile Matter @ 105 oC (% by mass)	%	-	0.80	IS 3660 (Part 2) 1985 ASTM D 1278
Nitrogen Content (% by mass)	%	-	0.60	IS 3660 (Part 10) 2000 ASTM D 3533
Initial Plasticity (P0)	-	30	40	IS 3660 (Part 11) 1989 ASTM D 3194
Plasticity Retention Index (PRI)	%	40	-	IS 3660 (Part 12) 1989 ASTM D 3194
Mean Mooney Viscosity ML (1+4) @ 100 oC	MU	70	90	ASTM D 1646