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Viet Nam Natural Rubber
National Standard |
Medical Dental Grade TPI Granules, Synthetic Gutta Percha, Trans PolyIsoprene, TPI, Trans Isoprene Rubber, Trans-1,4-PolyIsoprene | V-Belts | China Largest Manufacturer of Meteorological Balloons | |||||
Natural Rubber |
TCVN
3769 - 95 |
IN
BLOCK |
EFFECTIVE
AS OF
01/01/1996 |
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 330III. 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 Method1. Dirt Content (% WT max.)
0.03 0.03 0.03 0.05 0.08 0.16 TCVN 6089:19952. Volatile Matter (% WT max.)
0.80 0.80 0.80 0.80 0.80 0.80 TCVN 6088:19953. Ash Content (% WT max.)
0.50 0.50 0.50 0.50 0.75 1.00 TCVN 6087:19954. Nitrogen Content (% WT max.)
0.60 0.60 0.60 0.60 0.60 0.60 TCVN 6091:19955. Initial Plasticity (Po) min.
35 - - 30 30 30 TCVN 6092:19956. Plasticity Retention Index (PRI) min.
60 60 60 60 50 40 TCVN 6092:19957. Colour Index max.
6 - - - - - TCVN 6093:19958. Mooney Viscosity ML (1'+4') 100oC
- 60 + 5
50 + 5
- - - TCVN 6090:19959. 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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