1. The versatility of the ink should be strong, which can not only cooperate with the pen head more widely, and achieve better writing performance, so as to better become the supporting product of the pen factory.
2. It is required that the ink should have corresponding false shrinkage and viscosity denaturation, and the intermittent performance of the ink should be long to achieve a longer capping time.
3. The ink must reach a certain particle fineness, which is lower than the gap between the ball and the ball seat, and has a strong dispersing ability to prevent clogging of the pen tip and affect writing.
4. The stability of the ink should be strong, and it can write normally under certain room temperature conditions, and the ink is uniform and not delaminated.
5. There is enough writing length, that is, a tube of ink can draw a longer line on the marking machine.
