Viet Nam Natural Rubber National Standard

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These standards are applied to natural rubber prossesed in block form (crumb) from latex and field grade materials such as cuplump, coagulum...

I. Classification:
Natural rubber in block form (crumb) is classified into 6 grades: SVR 3L, SVR CV60, SVR CV50, SVR5, SVR 10, SVR 20.

II. Weight and Dimensions:
Natural rubber in block form (crumb) is pressed into bales of rectangular shape with weight and dimensions spessified as below:

Weight	Reference Dimensions, mm
(kg)	LENGTH	WIDTH
33  1/3	670	330

III. Technical Requirements:
The specifications of natural rubber in block must conform to the standard limits stipulated as below:

Properties	SVR 3L	SVR CV60	SVR CV50	SVR 5	SVR 10	SVR 20	Testing Method
1.  Dirt Content (% WT max.)	0.03	0.03	0.03	0.05	0.08	0.16	TCVN 6089:1995
2.  Volatile Matter (% WT max.)	0.80	0.80	0.80	0.80	0.80	0.80	TCVN 6088:1995
3.  Ash Content (% WT max.)	0.50	0.50	0.50	0.50	0.75	1.00	TCVN 6087:1995
4.  Nitrogen Content (% WT max.)	0.60	0.60	0.60	0.60	0.60	0.60	TCVN 6091:1995
5.  Initial Plasticity (Po) min.	35	-	-	30	30	30	TCVN 6092:1995
6.  Plasticity Retention Index (PRI) min.	60	60	60	60	50	40	TCVN 6092:1995
7.  Colour Index max.	6	-	-	-	-	-	TCVN 6093:1995
8. Mooney Viscosity ML (1'+4') 100oC	-	60 + 5	50 + 5	-	-	-	TCVN 6090:1995
9. Rheograph (*)	R	R	R	-	-	-	TCVN 6094:1995

(*) Rheograph provided, if required.

IV. Packing, Labelling, Transpotation and Storage:
Rubber bale are wrapped in transparent or white Polyethylene bags (PE). The specifications of PE bags are as follow:- Thickness : 0.03 - 0.05 mm- Melting point : 109oC max- Dimensions : 1000 x 580 mmPE bags covering rubber bales are then sealed. 36 bales are stacked in 6 layers in a 1.2MT net wooden pallet. The pallet has the following dimension.1425 x 1100 x 930 mm or 1425 x 1100 x 1067 mm Remark: other packing can be used as per agreement between buyer and seller.Label must be printed according to a stipulated pattern on a PE sheet and then put inside PE bags in the middle and on both big surface of the bale. The following details must be indicated on this label:- Grade- Code of this standard (TCVN 3769-95)- Name of producer- Weight of baleSVR rubber must be stored in covered, dry, cool warehouse and protected from direct sunlight, rain, impurities, borers, other insects and violent shocks during storage, transportation and hadling.

Natural Rubber Processing Production Line

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