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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.

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