… of metal and other materials; preparations of a kind used as cores or coatings for welding electrodes or rods. …
Explanatory notes
… of metal and other materials; preparations of a kind used as cores or coatings for welding electrodes or rods. … . These are preparations used to remove oxides, scale, rust or tarnish from the surface of metals, or for … painting, etc. Pi ckling preparations are usually based on dilute acids (hydrochloric, sulphuric, …