| Corrodant |
|
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
Comments |
| Magnesium Chloride | 2574 | ... | ... | X | C | B | X | B | X | B | A | B | B | A | B | A | A | ... | A | A | ... | Comment 1 |
| Magnesium Hydroxide | ... | ... | ... | A | A | A | B | A | A | B | A | A | A | A | A | A | ... | ... | A | A | ... | - |
| Magnesium Nitrate | ... | ... | ... | B | B | ... | B | B | C | B | B | B | B | B | B | X | B | ... | A | A | ... | ... |
| Magnesium Sulfate | - | - | - | B | B | B | B | B | A | A | A | B | B | A | B | A | A | - | A | A | - | - |
| MacDermidTM M629 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | A | A | Note 1 Comment 2 |
| Mercuric Chloride | 579 | - | - | X | X | X | X | X | X | X | X | X | X | X | X | X | B | - | A | A | - | - |
| Mercury | 674 | - | - | A | A | A | X | X | X | B | B | B | A | A | A | B | X | - | A | - | - | - |
| Methyl Alcohol (Methanol) | 149 | 52 | 867 | B | B | - | C | B | B | A | A | B | A | A | B | A | A | - | A | A | - | Note 2 |
| Methyl Bromide | 38 | None | 998 | C | C | - | X | B | B | B | B | A | A | A | B | B | A | - | A | - | - | - |
| Methyl Chloride | -11 | <32 | 1170 | C | C | - | X | A | C | C | C | C | C | C | C | C | A | - | A | A | - | Comment 1 |
| Methylene Chloride | 104 | - | 1224 | - | C | - | C | C | B | C | B | C | B | A | C | B | A | - | A | A | - | Comment 1 |
| Mineral Oil | - | 500 | - | A | A | - | A | A | A | A | A | A | A | A | A | A | A | - | A | A | - | - |
| Muriato | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | A | - | A | Note 1 |
