National Standard: Deproteinized concentration natural rubber latex –
Type
|
Total nitrogen content, % content
|
DPNR5
|
0,05
|
DPNR15
|
0,15
|
DPNR30
|
0,3
|
Characteristic
|
Type
|
Test method
|
||
DPNR5
|
DPNR15
|
DPNR30
|
||
1. Total nitrogen content, % (m/m) of total solids, max.
|
0,05
|
0,15
|
0,3
|
TCVN 6091
(ISO 1656) |
2. Total solids content, % (m/m), min.
|
61,0
|
61,0
|
61,0
|
TCVN 6315
(ISO 124) |
3. Dry rubber content, % (m/m), min.
|
60
|
60
|
60
|
TCVN 4858
(ISO 126) |
4. Non-rubber solids, % (m/m), max.
|
1,7
|
1,7
|
1,7
|
1)
|
5. Mechanical stability 2), second, min.
|
650
|
650
|
650
|
TCVN 6316
(ISO 35) |
6. Coagulum content, % (m/m), max.
|
0,03
|
0,03
|
0,03
|
TCVN 6317
(ISO 706) |
7. Volatile fatty acid (VFA) number, max
|
0,06
|
0,06
|
0,06
|
TCVN 6321
(ISO 506) |
8. Sludge content, % (m/m), max.
|
0,10
|
0,10
|
0,10
|
TCVN 6320
(ISO 2005) |
9. Copper content, mg/kg of total solids, max.
|
8
|
8
|
8
|
TCVN 6318
(ISO 8053); ISO 6101-3 |
10. Manganese content, mg/kg of total solids, max.
|
8
|
8
|
8
|
TCVN 6319
(ISO 7780); ISO 6101-4 |
11. KOH number, max.
|
0,7
|
0,7
|
0,7
|
TCVN 4856
(ISO 127) |
1) Difference between total solids content and dry rubber content.
2) Mechanical stability normally stabilizes within 21 days.
|