India reveals draft standard for Toluene Diisocyanate 
On August 2, 2021, the Bureau of Indian Standards (BIS) announced a draft standard specifying requirements, sampling and test methods for toluene diisocyanate (TDI-80), and is inviting comments until September 1, 2021. TDI-80 shall be a mixture of 2,4-toluene diisocyanate (80%) and 2,6-toluene diisocyanate (20%), and this proposed standard covers TDI-80 Type I (for low acidity). Each test is specified in Annex A through G, and the requirements in Table 1 must be observed. In addition, the containers used must be those agreed upon between the purchaser and supplier, and must be labeled with information about the substance and manufacturer. In addition, the Standard Mark may be displayed if certification has been obtained under the Conformity Assessment Scheme under the Indian Standards Act, 2016 and related regulations.
Table 1: Requirements for Toluene Di-isocyanate
| No. | Characteristics |
Requirements |
Methods of Test, Refer to |
|
|
Annex No. |
IS |
|||
| i) | Appearance |
Clear liquid without any haze or foreign particle |
A |
|
| ii) | Colour（Pt-Co、Max） |
25 |
8768 |
|
| iii) | Purity（percent by mass、Min） |
99.5 |
B |
－ |
| iv) | Hydrolyzable Chlorine（percent by mass、Max） |
0.0080 |
C |
－ |
| v) | Acidity（percent by mass、Max） |
0.0040 |
D |
－ |
| vi) | Total Chlorine（percent by mass、Max） |
0.07 |
E |
－ |
| vii) | Nitro Isocyanates（percent by mass、Max） |
0.004 |
F |
－ |
| viii) | Isomer Ratio（2,4-TDI：2,6-TDI） |
79-81.5:18.5-21.0 |
G |
－ |
| ix) | Anti-oxidant or/and Performance Additives* |
－ |
－ |
－ |
* Name of the Anti-oxidant or/and Performance Additives, their levels and analysis methods shall be provided on mutual agreement between buyer and seller
The container should be an appropriate drum, tanker, ISO container, or other container agreed upon between the purchaser and the supplier. In addition to information such as the name of the substance, the name of the manufacturer, the date of manufacture, the lot or batch number, the net weight, and the POISON (in red, on a white background, see part 1 of IS 1260), each container must be marked with the following precaution.
“KEEP WELL CLOSED AND PROTECTED FROM LIGHT. TOXIC. AVOID CONTACT WITH SKIN”
The draft standard can be downloaded from the following URL.
https://www.services.bis.gov.in:8071/php/BIS/WCDraft/wcfiles/17834.pdf
