Fastness property

What is fastness property?

(Fastness property in French: solidité) Application oriented resistance of dried printing inks, toner and inks as well as colored foils to external influences; fastness property categories for printing inks according to DIN 16525: 1 “very low”, 2 “low”, 3 “moderate”, 4 “fairly good”, 5 “good”, 6 “very good”, 7 “excellent”, 8 “outstanding”; physical testing  methods: Light fastness (ISO 12040: UV radiation), heat resistance (IR radiation); chemical testing methods (ISO 2836): Alkali fastness (pH > 7, overpaintability, glues, soaps, detergents), water fastness (pH = 7), acid fastness (pH < 7), solvent fastness (alcohols, nitro compounds, benzene compounds), paint fastness (DIN 16544/16524: paint solvents, softener diffusion, gradation errors, sticking together, embrittling), paraffin/wax fastness, oil/grease fastness, spice fastness, weather fastness (weathering system).