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HUY & BROTHERS Co. Ltd. is principally a global trading organisation with worldwide interests. It is incorporated in Vietnam as an independent entity

 

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% .

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
CV 60

SVR
CV 50

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)

PACKAGINE, LABELLING, TRANSPORTATION & 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: 109o C 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

 

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:

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

RUBBER SMOKED SHEET 
RIBBED SMOKED SHEET CLASSIFICATION - BASED ON THE GREEN BOOK  1969

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.