Protecting solid objects against biological degradation of the surface

摘要

Method for inhibiting degenerative changes in the surface of a solid object caused by microorganisms and other life forms capable of biological degradation of organic or inorganic substances, comprises applying transparent particles with a size of 0.1 x 0.1 x 0.001 mu and having a composition Cu1/!yZn1-x(AlO2)4-2x or Zn1/!yCu1-x(AlO2)4-2x in which y = 0-1 and x = 0-1.