What is a rotary color fastness tester?

 

The tester consists of a rotating brass finger or rubbing head, which is loaded with a specified force and moves in a circular motion over the test specimen. The rubbing action simulates the frictional forces that occur during normal use or wear, such as when a fabric rubs against another fabric or against human skin.

 

To perform a test, a sample of the material to be tested is securely clamped onto a stationary platform or holder. The rubbing head, usually covered with standard white or dyed fabric, is pressed against the material surface with a specified load. The head then moves in a back-and-forth or circular motion for a predetermined number of cycles or for a specific duration.

After the rubbing process, the test specimen and the rubbing head are visually inspected or measured for color transfer or staining. The amount of color transfer is assessed using a gray scale or color scale, which provides a standardized reference to determine the colorfastness rating.

 

The rotary color fastness tester is an essential tool in the textile and garment industry to assess the potential for color transfer, particularly in products such as clothing, upholstery, and automotive textiles. It helps manufacturers and quality control professionals ensure that the colors used in their products are resistant to rubbing and will not easily transfer onto other surfaces during use or laundering.