NATIONAL STANDARDS OF SVR
THE SPECIFICATIONS OF TECHINCAL SPECIFIED RUBBER (TCVN 3769:2004)
These standards are applied to natural rubber processed in block form (crumb) from latex and field grade materials such as cuplump, coagulum.
Weight and Dimensions: Natural rubber in block form (crumb) is Pressed into bales of rectangular shape with weight and dimensions specified as afer: 670 mm x 330 mm x 170 mm and weight 33.3 kg or 35 kg ± 5% .
The specifications of natural rubber in block must conform to the standard limits stipulated as below:
|
Parameter * |
GRADE |
|
||||||||
|
SVR |
SVR |
SVR L
|
SVR 3L |
SVR 5 |
SVR 10CV
|
SVR 10 |
SVR 20CV
|
SVR 20 |
TESTING |
|
|
Field latex material |
Field latex or sheet material |
Field grade material |
METHODS |
|||||||
|
1. Dirt content, % wt. Max |
0.02 |
0.02 |
0.02
|
0.03 |
0.05 |
0.08 |
0.08 |
0.16 |
0.16 |
TCVN 6089:2004 |
|
2. Volatile matter, % wt. Max |
0.80 |
0.80 |
0.80
|
0.80 |
0.80 |
0.80 |
0.80 |
0.80
|
0.80 |
TCVN 6088:2010 |
|
3. Ash content, % wt. Max |
0.40 |
0.40 |
0.40
|
0.50 |
0.60 |
0.60 |
0.60 |
0.80
|
0.80 |
TCVN 6087:2010 |
|
4. Nitrogen content, % wt. Max |
0.60 |
0.60 |
0.60
|
0.60 |
0.60 |
0.60 |
0.60 |
0.60
|
0.60 |
TCVN 6091:2004 |
|
5. Initial plasticity (PO). Min |
– |
– |
35
|
35 |
30 |
–
|
30 |
–
|
30 |
TCVN 6092-2:2004 |
|
6. Plasticity retention index (PRI). Min |
60 |
60 |
60
|
60 |
60 |
50
|
50 |
40
|
40 |
TCVN 6092-1:2004 |
|
7. Lovibond Color Index (max) |
– |
– |
4
|
6 |
– |
–
|
– |
–
|
– |
TCVN 6093:2004 |
|
8. Mooney viscosity ML (1’ + 4’) 100oC |
60 ± 5 |
50 ± 5 |
–
|
– |
– |
60 +7,-5
|
– |
65 +7,-5
|
– |
TCVN 6090-1:2004 |
|
9. Cure ** |
R |
R |
R
|
R |
– |
R
|
– |
R
|
– |
TCVN 6094:2004 |
| 10. Color coding strip |
Orange
|
Transparent
|
White opaque
|
|||||||
| 11. Color coding marker |
Black
|
Light green
|
Magenta
|
Brown
|
Yellow
|
Red
|
||||
* Testing for compliance shall follow ISO test methods
** Cure information is provided in the form of rheograph (R)
PACKING, LABELLING, TRANSPORTATION AND STORAGE
Rubber bales are wrapped in transparent white bags made from low density polyethylene (PE). The specifications of PE bags are as follows:
- Thickness: 0.03 – 0.04 mm
- Melting point: 109oC max
- Dimensions: 1000 x 580 mm
PE bags covering rubber bales are then sealed. 36 bales are stacked in 6 layers in wooden palet having the following dimensions: 1425 x 1100 x 930 mm or 1425 x 1100 x 1067 mm.
REMARK:
Other packages can be used as per the 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 surfaces of the bale with the following details: Grade, Code of this Standard (TCVN – 3769-2004). Name of Producer, Weight of Bale, Trade Mark.
SVR must bestored in covered, dry, coolwarehouses and protected from direct sunlight, rain, impurities, borers, other insects and violent shocks during storage, transportation and handling.
NATIONAL STANDARDS: THE SPECIFICATIONS OF NATURAL LATEX CONCENTRATE (TCVN 6314: 2007)
|
Properties |
Limit/b> |
||||
|
HA |
LA |
XA |
Creamed HA |
Creamed LA |
|
|
1. Total solids content %wt Min. |
61.5 |
61.5 |
66.0 |
66.0 |
66.0 |
|
2. Dry Rubber Content (DRC), % wt Min. |
60.0 |
60.0 |
64.0 |
64.0 |
64.0 |
|
3. Non – rubber content % wt Max. (TSC minus DRC) |
2.0 |
2.0 |
2.0 |
2.0 |
2.0 |
|
4. Total Alkalinity (NH3) % wt Min. Max. |
0.60 – |
–
0.29 |
0.3 – |
0.55 – |
– 0.35 |
|
5. Mechanical Stability (MST) Sec Min. |
650 |
650 |
650 |
650 |
650 |
|
6. Coaguium content % wt. of TSC Max. |
0.05 |
0.05 |
0.05 |
0.05 |
0.05 |
|
7. Copper content. Mg/kg % of TSC Max. |
8 |
8 |
8 |
8 |
8 |
|
8. Manganese content, mg/kg % of TSC Max. |
8 |
8 |
8 |
8 |
8 |
|
9. Sludge content, % wt. of TSC Max. |
0.10 |
0.10 |
0.10 |
0.10 |
0.10 |
|
7. Volatile fatty acid (VFA) Max. |
0.20 |
0.20 |
0.20 |
0.20 |
0.20 |
|
8. KOH number Max. |
1.0 |
1.0 |
1.0 |
1.0 |
1.0 |
* Natural rubber foam mattress
** Rubber gloves
|
Category |
Rubber Mold |
Wrapping mold |
Opaque Spots |
Over smoked spots |
Oxidized spots |
Burnt sheets |
|
RSS 1 |
very slight |
very slight |
No |
No |
No |
No |
|
RSS 2 |
slight |
slight |
No |
No |
No |
No |
|
RSS 3 |
slight |
slight |
slight |
No |
No |
No |
|
RSS 4 |
slight |
slight |
slight |
slight |
No |
No |
|
RSS 5 |
slight |
slight |
slight |
slight |
N/A |
No |
|
Category |
Brief description of Ribbed Smoked Sheet grades (Based on the The Green Book – 1969) |
|
|
RSS 1 |
Each bale must be packed free of mould but very slight traces of dry mould on wrappers or bale surfaces adjacent to wrapper found at the time of delivery will not be objected to, provided there is no penetration of mould inside the bale. Oxidized spots of streaks, weak, heated, under-cured, over-smoked, opaque and burnt sheets are not permissible. The rubber must be dry, clean, strong, sound and free from blemishes resinous matter (rust), blisters, sand, dirty packing and any other foreign matter except slight specks as shown in the sample. Small pinhead bubbles, if scattered will not be objected to. |
 |
|
RSS 2 |
Slight resinous matter (rust) and slight amounts of dry mould on wrappers, bale surfaces and interior sheets, found at the time of delivery will not be objected to. Should “rust” or “dry mould” in an appreciable extent appear on more than 5% of bales sampled, it shall constitute grounds for rejection. Small bubbles and slight specks of bark to the extent as shown in the sample will not be objected to. Oxidized spots of streaks, weak, heated, under-cured, over-smoked, opaque and burnt sheets are not permissible. The rubber must be dry, clean, strong, sound and free from blemishes, resinous matter (rust), blisters, sand, dirty packing and all other foreign matter other than those specified above are permissible. |
 |
|
RSS 3 |
Slight resinous matter (rust) and slight amounts of dry mould on wrappers, bale surfaces and interior sheets, found at the time of delivery will not be objected to. Should “rust” or “dry mould” in an appreciable extent appear on more than 10% of the bales sampled, it shall constitute grounds for rejection. Slight blemishes in colour, small bubbles and small specks of bark are permissible to the extent shown in the sample. Oxidized spots or streaks, weak, heated, under-cured, over-smoked, opaque and burnt sheets are not permissible. The rubber must be dry, strong and free of blemishes, blisters, sand, dirty packing and all other foreign matter other than those specified above as permissible. |
 |
|
RSS 4 |
Slight resinous matter (rust) and slight amounts of dry mould on wrappers, bale surfaces and interior sheets, found at the time of delivery will not be objected to. Should “rust” or “dry mould” in an appreciable extent appear on more than 20% of the bales sampled, it shall constitute grounds for rejection. Medium sized bark particles, bubbles, translucent stains, slightly sticky and slightly over-smoked rubber are permissible to the extent as shown in the sample. Oxidized spots or streaks, weak, heated, under-cured, over-smoked (in excess of the degree shown in the sample) and burnt sheets are not permissible. The rubber must be dry, firm and free of blemishes, blisters, sand, dirty packing and all other foreign matter other than those specified above as permissible. |
 |
|
RSS 5 |
Slight resinous matter (rust) and slight amounts of dry mould on wrappers, bale surfaces and interior sheets, found at time of delivery will not be objected to. Should “rust” or “dry mould” in an appreciable extend appear on more than 30% of the bales sampled, it shall constitute grounds for objection. Large bark particle, bubbles and small blisters, stains, over–smoked, slightly sticky rubber and blemishes of the amount and size shown in the sample are permissible. Slightly under dried rubber is permissible. Weak, heat, burnt, oxidized spots or streaks are not permissible. The rubber must be dry, firm, and free of blemishes except to the extent shown in the samples. Dirty packing, sand and all other foreign matter other than specified above is not permissible. |
|
VRG NATURAL RUBBER BRAND TECHNICAL REGULATIONS
TCCS 112:2017/HĐTVCSVN
|
Parameter |
Limit/b> |
|||||
|
SVR CV60 |
SVR CV50 |
SVR 3L |
SVR 10 |
SVR 20 |
Test Method |
|
| Dirt content, % m/m, not more than | 0.02 | 0.02 | 0.03 | 0.07 | 0.15 | TCVN 6089 (ISO 249) |
| Ash content, % m/m, not more than | 0.40 | 0.40 | 0.40 | 0.60 | 0.70 | TCVN 6087 (ISO 247) |
| Volatile matter, % m/m, not more than | 0.70 | 0.70 | 0.70 | 0.70 | 0.70 | TCVN 6088-1 (ISO 248-1) |
| Nitrogen content, % m/m, not more than | 0.50 | 0.50 | 0.50 | 0.50 | 0.50 | TCVN 6091 (ISO 1656) |
| Initial Wallace Plasticity (P0), not less than | – | – | 35 | 30 | 30 | TCVN 8493 (ISO 2007) |
| Plasticity Retention Index (PRI), not less than | 60 | 60 | 60 | 50 | 40 | TCVN 8494 (ISO 2930) |
| Mooney viscosity ML (1’ + 4’) at 100 0C | 60(+/-5) | 50(+/-5) | **73-93 | **73-93 | – | TCVN 6090-1 (ISO 289-1) |
| Lovibond Color, not more than* | – | – | 6 | – | – | TCVN 6093 (ISO 4660) |
*: for rubber types are not regulated Lovibond color, the color must be equality on a rubber bale and on the whole lot
**: only check mooney viscosity of SVR 3L, SVR 10 when customers request.
LATEX LA
| PARAMETERS | LIMITS TYPE | |
| Total Solids Content | %wt | 61 MIN |
| Dry Rubber Content | %wt | 60 MIN |
| Non Rubber Solids | %wt | 1.7 MAX |
| Alkalinity (as NH3) | %wt | 0.29 MAX |
| Mechenical Stability Time (MST) | see | 650 MIN |
| Coagulum content | %wt | 0.03 MAX |
| Copper content | mg/kg | 8.0 MAX |
| Maganese content | mg/kg | 8.0 MAX |
| Sludge content | %wt | 0.1 MAX |
| Volatile Fatty Acid (VFA) | number | 0.06 MAX |
| Potassium (KOH) | number | 0.7 MAX |
LATEX HA
| PARAMETERS | LIMITS TYPE | |
| Total Solids Content | %wt | 61 MIN |
| Dry Rubber Content | %wt | 60 MIN |
| Non Rubber Solids | %wt | 1.7 MAX |
| Alkalinity (as NH3) | %wt | 0.6 MAX |
| Mechenical Stability Time (MST) | see | 650 MIN |
| Volatile Fatty Acid (VFA) | number | 0.06 MAX |
| Potassium (KOH) | number | 0.7 MAX |
| pH | value | |
| Viscosity at 60% TSC | cP | |