material degradation
undesired alteration of material properties over time
corrosion
gradual destruction of materials by chemical reaction with their environment
polymer degradation
Alteration in the polymer properties under the influence of environmental factors
glass disease
chemical degradation of old glass
food spoilage
process in which food deteriorates to the point in which it is not edible to humans or its quality of edibility becomes reduced
tin pest
deterioration of tin objects at low temperatures
rancidification
conversion of fats and oils into foul-tasting or -smelling substances
wear and tear
naturally occuring physical damage from normal wear and aging