Brass Metal Powder
Highly pure, very fine 240 mesh irregular brass metal powder suitable for a range of applications including resin-casting (cold casting), decorative coatings and powder metallurgy.
Use In Cold-Casting / Resin Casting
Added to the whole of the resin mix, brass powder will increase the density of a casting (making it feel heavier) as well as its thermal conductivity (making it feel colder). Alternatively, it can be added in higher ratios to only a thin surface layer by slush-casting or rotational-moulding, giving a very metallic surface to a casting that can then be back-filled with unfilled resin.
A ratio of at least 50% brass powder (by weight) would be required to result in a significantly metallic appearance. Higher ratios, up to the limit of pourability, will yield a more impressive metallic appearance and feel.
When adding metallic powders to polyester or vinylester resin systems it is important to catalyse the resin prior to adding the metal powder so as to avoid any adverse reaction (rapid oxidisation) of the metal powder by the catalyst.
Such oxidisation or other adverse reactions are unlikely to occur with polyurethane or epoxy resins but it may still be a good idea to mix the resin and hardeners together before adding the metal powder.
Revealing the Appearance
After casting, the metallic appearance will not be clear or vivid because the metal particles will be obscured behind a thin layer of resin. To reveal the metallic appearance, the casting can be rubbed with an abrasive pad or wire-wool.
After exposing brass particles on the surface of a casting, the brass on the surface will patina (rust) in the same way that a conventional brass product would which means that it will quickly take on the distinctive dull turquoise colour of patinated brass.