2.16. Corrosive to metals
2.16. Corrosive to metals
A substance or a mixture that is corrosive to metals means a substance or a mixture which by chemical action will materially damage, or even destroy, metals.
2.16.2. Classification criteria
2.16.2.1. A substance or a mixture which is corrosive to metals is classified in a single category for this class, using the test in Part III, sub-section 37.4 of the
►M4
UN RTDG ◄ , Manual of Tests and Criteria, in accordance with Table 2.16.1:
2.16.2.1. A substance or a mixture which is corrosive to metals is classified in a single category for this class, using the test in Part III, sub-section 37.4 of the ►M4 UN RTDG ◄ , Manual of Tests and Criteria, in accordance with Table 2.16.1:
Table 2.16.1
Criteria for substances and mixtures corrosive to metals
|
Category |
Criteria |
|
1 |
Corrosion rate on either steel or aluminium surfaces exceeding 6,25 mm per year at a test temperature of 55 oC when tested on both materials. |
Note
Where an initial test on either steel or aluminium indicates the substance or mixture being tested is corrosive the follow up test on the other metal is not required.
2.16.3. Hazard Communication
Label elements shall be used for substances and mixtures meeting the criteria for classification in this hazard class in accordance with Table 2.16.2.
Table 2.16.2
Label elements for substances and mixtures corrosive to metals
|
Classification |
Category 1 |
|
GHS Pictogram |
|
|
Signal Word |
Warning |
|
Hazard Statement |
H290: May be corrosive to metals |
|
Precautionary Statement Prevention |
P234 |
|
Precautionary Statement Response |
P390 |
|
Precautionary Statement Storage |
P406 |
|
Precautionary Statement Disposal |
|
Note:
Where a substance or mixture is classified as corrosive to metals but not corrosive to skin and/or eyes, the labelling provisions set out in section 1.3.6 shall be used.
2.16.4. Additional Classification Considerations
2.16.4.1. The corrosion rate can be measured according to the test method of Part III sub-section 37.4 of the
►M4
UN RTDG ◄ , Manual of Tests and Criteria. The specimen to be used for the test shall be made of the following materials:
(a)
for the purposes of testing steel, steel types
—
S235JR+CR (1.0037 resp.St 37-2),
—
S275J2G3+CR (1.0144 resp.St 44-3), ISO 3574 as amended, Unified Numbering System (UNS) G 10200, or SAE 1020;
(b)
for the purposes of testing aluminium: non-clad types 7075-T6 or AZ5GU-T6.
2.16.4.1. The corrosion rate can be measured according to the test method of Part III sub-section 37.4 of the ►M4 UN RTDG ◄ , Manual of Tests and Criteria. The specimen to be used for the test shall be made of the following materials:
for the purposes of testing steel, steel types
for the purposes of testing aluminium: non-clad types 7075-T6 or AZ5GU-T6.