 |
| incombustible: 43 phrases in 13 subjects |
| Chemistry | 3 |
| Construction | 7 |
| Electronics | 1 |
| Food industry | 1 |
| Forestry | 5 |
| Geology | 2 |
| Mechanic engineering | 2 |
| Military | 1 |
| Mining | 5 |
| Natural resourses and wildlife conservation | 1 |
| Technology | 11 |
| Textile industry | 2 |
| Trucks/Lorries | 2 |