Natural Rubber

CAMEROON NATURAL RUBBER ( CNR ) Rubber type: CNR 10 Origin:. Pre - coagulated products from the fields ( cuplump , coagulum and tree lace only ) processing: Pre - cleaning , cleaning , size reduction , blending / homogenisation , creping , granulation and drying in trolley dryers at a temperature between 105 and 120 ° C ( no chemical addition ) . Packaging: Pallets of 36 bales of 35 kgs each ( 1.260 kgs ) . Marketing: Sold after technical specifications in accordance with International norms on Natural rubber. Type of Rubber: CNR 3L ( Light coloured Rubber ) Origin: Field latex standardised and coagulated with acid in acidification tanks under well-known conditions . Processing: Washing , crushing , creeping , granulation and drying in trolley dryers at a temperature between 105 and 120 ° C ( no chemical addition ) . Packaging: Pallets of 36 bales of 35 kgs each ( 1.260 kgs ) . Marketing: Sold after technical specifications in accordance with International norms on Natural rubber. Parameters for specifications (Standard African Rubber Scheme SAR) Parameters for specifications (Standard African Rubber Scheme SAR) Characteristics & parameters LATEX GRADES 3L And 3 COAGULUM AND FIELD GRADES (10) Dirt content retained on 45mm sieve (max % ) 0.0 0.0 0.08% Ash content ( max . % wt . / wt . ) 0.6 0.6 10/ 0.7% Volatile matter ( max . % wt . / wt . ) 0.8 0.8 0.8 Nitrogen ( max . % wt./wt . ) 0.6 0.6 0.6 Initial Plasticity ( Po , Min ) 30 30 30 Plasticity Retention Index ( PRI , Min . ) 60 60 50 Lovibond Colour ( max . ) 6 6 6 Criteria for grading and certification Three criteria are used in the grading and certification of our rubber . They are : A ) No individual test value should be outside the specified limit . This is applied to all properties without exception . B) Use of special producers ' limits or cahier des charges but this attracts payment of a premium per kilogramme of rubber . ( Currently special producers ' limits are applied to properties like Mooney viscosity , Po and PRI ) . C) Mean plus three standard deviation rule . This is applied to properties such as dirt and ash . The application of this rule is associated with properties that have a " Normal " or " Gaussian " distribution in order to minimise the risk of a defective bale being present in a lot . Shipment conditions FOB , in containers of 20.160 tons ( 16 pallets shrink - wrapped on wooden bottom treated as per ISPM 15 requirements ) or in loose bales containers of 22.680 tons