Spring-loaded roller apparatus (CTR)

For ISO 8502-3 cleaning tape test. .
Uniform pressure can be applied to the cleaning tape by means of the cleaning tape roller. The top of the red indicator ring is calibrated at 4 kg (39.2 N) while the bottom indicates a force calibration of 5 kg (49 N).

The CTR is made of selected materials that provide essentially maintenance-free service until the components wear out. We do not recommend lubrication in any area.

This will also prevent contamination of the tape or test area from excess lubrication. The external surfaces of the CTR can be cleaned with a non-chlorinated solvent (Ensolv, etc.) or a spray cleaner (409, Spray Nine, etc.). The CTR should not be immersed in a cleaner .

Procedure:
1.- First discard the first three turns of tape from the roll.
2.- Remove a piece approximately 8" long.
3.- Touching the sticky side only at the ends, press about 6" of newly exposed tape firmly onto the surface to be tested.
4.- Press by placing your thumb on one end of the tape and moving your thumb along the tape at a constant speed and pressure. Do this three times in each direction, making each stroke take approximately 5 to 6 seconds.

• NOTE: While a test procedure in which pressure is applied to a tape with the thumb is subjective, it is generally adequate, especially for use in situations where dust-free surfaces are required. In controversial cases, except when rust grade C or D is involved, pressure can be applied to the back of the adhesive tape with a spring-loaded roller. See ISO F502.

5.- Remove the tape from the test surface.
6.- Display the results on an appropriate contrasting card, tile or background paper by rubbing with your thumb to adhere.
7.- Determine the AMOUNT OF DUST on the tape by visually comparing an area of ​​the tape equal to the reference area shown in FIGURE 1 below.
8.- Determine the predominant DUST PARTICLE SIZE on the tape by referring to TABLE 1, which defines six classes of dust particle size, designated 0, 1, 2, 3, 4 and 5.
9.- Complete a significant number of tests to correctly identify the characteristics of the tested surface. Complete at least three separate tests for each surface of a particular type of appearance. Complete at least two additional tests for each result that has a quantity rating or less.

• NOTE: Please refer to ISO 8502-3 for the exact procedure.