A study of the chemical and physical properties of magnetic recording tape

A study has been made of the chemical and physical properties of magnetic recording tape. The chemical studies indicate the possible relationship between a series of solvent tests and the wear properties of commercially available tapes. The physical studies, including electron micrographs, indicate a smaller unit crystal size for γ-ferric oxide than previously supposed and a relationship between a better dispersion and improved magnetic properties. Both studies are being continued in greater detail.