The main technical content includes 13 physical and chemical properties and corresponding test methods such as appearance, viscosity, surface tension, pH, insoluble matter, initial writing performance, writing performance, intermittent writing, dryness, adhesion, water resistance, light resistance and preservation. , and stipulates the content of migratable elements in the ink.
T/CWIA 1009-2020 history
2020T/CWIA 1009-2020 Inks for long cap-off time permanent marker