1. Dry Natural Rubber:
1.1 Block Natural Rubber: Technically Specified Rubber (TSR) such as Standard Vietnamese Rubber (SVR): SVR CV 50, SVR CV 60, SVR L, SVR 3L, SVR 5, SVR 10, SVR 20, SVR 10CV, Skim Block, Mixture Rubber, Compound Rubber …
1.1.1 Weight and Dimensions of rubber bales: 33.333kg or 35kg, 670 mm x 330 mm x 170 mm.
1.1.2 Packing: rubber bales are packed in PE bags with normal thickness: 0.03 – 0.04mm or thick thickness: 0.1 – 0.14mm, then stuffed into container in loose bales, palletized in wooden crates, in Shrink Wrapped (SW) based on wooden pallets or Disposable Plastic Pallets (DPP), Metal boxes as per customer’s request.
1.1.3 Standard Vietnamese Rubber (SVR) Specifications:
|
Parameter |
Grade |
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|
SVR CV 50 |
SVR CV 60 |
SVR L |
SVR 3L |
SVR 5 |
SVR 10CV |
SVR 10 |
SVR 20CV |
SVR 20 |
|
|
1. Dirt content (max. % wt)(retained on 45 micron sieve) |
0.02 |
0.02 |
0.02 |
0.03 |
0.05 |
0.08 |
0.08 |
0.16 |
0.16 |
|
2. Ash content (max. % wt) |
0.40 |
0.40 |
0.40 |
0.50 |
0.60 |
0.60 |
0.60 |
0.80 |
0.80 |
|
3. Nitrogen content (max. % wt) |
0.60 |
0.60 |
0.60 |
0.60 |
0.60 |
0.60 |
0.60 |
0.60 |
0.60 |
|
4. Volatile matter (max. % wt) |
0.80 |
0.80 |
0.80 |
0.80 |
0.80 |
0.80 |
0.80 |
0.80 |
0.80 |
|
5. Initial plasticity (Po) (min.) |
– |
– |
35 |
35 |
30 |
– |
30 |
– |
30 |
|
6. Plasticity retention index (PRI) (min.) |
60 |
60 |
60 |
60 |
60 |
50 |
50 |
40 |
40 |
|
7. Lovibond Color Index (max.) Difference between samples (max.) |
– – |
– – |
4 – |
6 2 |
– – |
– – |
– – |
– – |
– – |
|
8. Mooney viscosity ML (1’ + 4’) 100oC |
50 ± 5 |
60 ± 5 |
– |
– |
– |
60 (+7 -5) |
– |
65 (+7 -5) |
– |
|
1.2 Ribbed Smoked Sheet (RSS): RSS 1, RSS 2, RSS 3, RSS 4, RSS 5 1.2.1 RSS Classification and Description (based on The Green Book - 1969):
|
|
Grade |
Rubber mold |
Wrapping mold |
Opaque spots |
Over smoked spots |
Oxidized spots |
Burnt sheet |
|
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 |
|
Grade |
Description |
|
RSS 1 |
Clean, dry, strong, small-scattered pinhead bubbles, free from blemishes, sand,foreign matter, under-cured. |
|
RSS 2 |
Dry mold no more than 5%, clean, dry, strong, small-scattered bubbles,specks of bark, free from blemishes, sand, foreign matter, under-cured. |
|
RSS 3 |
Dry mold no more than 10%, clean, dry, strong, small-scattered bubbles, specks of bark, free from blemishes, sand, foreign matter, under-cured. |
|
RSS 4 |
Dry mold no more than 20%, clean, dry, strong, small-scattered bubbles, specks of barks, free from blemishes, sand, foreign matter. |
|
RSS 5 |
Dry mold no more than 30%, clean, dry, strong, large bark particles and bubbles, small blisters, blemishes, free from sand, foreign matter. |
|
1.2.2 Weight of rubber bales: 33.333kg/ 35kg or 111.11 kg as per customer request
2. Latex: High Ammonia (HA), Low Ammonia (LA) and other Latex as per customer’s request. 2.1 Latex containing: in flexi bag, metal drums, plastic tanks as per customer’s request. 2.2 Natural Rubber Latex Concentrate |
|
Parameter |
Centrifuged Latex |
Creamed Latex |
Testing Methods |
|||
|
Type HA |
Type LA |
Type XAc |
Type HA |
Type LA |
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|
Total solids content (TSC), % (weight), min. |
61.0 or by an agreement between two parties |
65.0 |
65.0 |
TCVN 6315 (ISO 124) |
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|
Dry Rubber Content (DRC), % (weight), min. |
60.0 |
60.0 |
60.0 |
64.0 |
64.0 |
TCVN 4858 (ISO 126) |
|
Non-rubber content, % (weight), max.a |
1.7 |
1.7 |
1.7 |
1.7 |
1.7 |
– |
|
Total Alkalinity (NH3), by weight of Latex Concentrate, % (weight) |
min 0.60 |
max 0.29 |
0.30 – 0.59 |
min 0.55 |
max 0.35 |
TCVN 4857 (ISO 125) |
|
Mechanical Stability Time (MST), sec., min.b |
650 |
650 |
650 |
650 |
650 |
TCVN 6316 (ISO 35) |
|
Coagulum content, % (weight), max. |
0.03 |
0.03 |
0.03 |
0.03 |
0.03 |
TCVN 6317 (ISO 706) |
|
Copper content, mg/kg of TSC, max. |
8 |
8 |
8 |
8 |
8 |
TCVN 6318 (ISO 8053) |
|
Manganese content, mg/kg of TSC, max. |
8 |
8 |
8 |
8 |
8 |
TCVN 6319 (ISO 7780) |
|
Sludge content, % (weight), max. |
0.10 |
0.10 |
0.10 |
0.10 |
0.10 |
TCVN 6320 (ISO 2005) |
|
Volatile fatty acid (VFA), max. |
0.06 or by an agreement between two parties |
TCVN 6321 (ISO 506) |
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|
KOH number, max. |
0.70 or by an agreement between two parties |
TCVN 4856 (ISO 127) |
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|
a. Difference between Total solids content (TSC) and Dry Rubber Content (DRC). b. Mechanical Stability Time normally stabilizes within 21 days. c. XA is equivalent to the medium ammonia latex. |
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