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See Chinese contents: GB/T 13217.4-2020 GB/T 13217.4-2020: Test method for viscosity of ink
This standard specifies the testing methods for ink viscosity, including the coated No.4 cup viscometer method, the Zahn cup viscometer method, the coaxial cylindrical rotary viscometer method, the cone-plate viscometer method, the falling stick viscometer method, the parallel plate viscometer method.
