On the surface, thickness seems like an easy measurement to take, as dimensional measurements go. You have two big, flat, parallel planes on which to plant your gage.
In my last column I beat up on the calibration of adjustable thread ring gages. Since I’m a nice guy, I thought it only fair that non-adjustable or solid thread ring gage calibration get similar treatment.
Companies are increasingly using optical brightening agents (OBAs) to achieve a “whiter-than-white” effect on a range of materials, including plastics, paints and coatings and paper.