Bristle length (440 ± 20) mm visible Penetration (100 ± 20) mm (see Figure 7) The state of the brushes shall be regularly controlled. At least one monitoring of the total amount of operating hours in use for the brush and an automatic replacement of the brush shall be conducted as soon as 30 operating hours are reached (30 hours equates around 300 test runs since one test takes around 6 minutes). The amount of operating hours shall be reported with the haze increase result of the sample. 4.8.1.2. Spray nozzle: Number 2 (spray alternatively and against the direction of travel of the test panel holder) Material stainless Spread of jet 65° Water flow rate (2.2 ± 0.1) l/min. at (300 ± 50) kPa The two nozzles shall spray alternately and against the direction of travel of the test panel holder. They shall produce the specified spray pattern (see instrument calibration in Figure 8). 4.8.1.3. Test panel holder Feed speed (5 ± 0.2) m/min. Pattern of movement if the brush is rotating clockwise, the right nozzle is spraying and the test panel holder travels from the left side to the right side (and vice versa) Figure 7 Movement pattern of washing brush and nozzle Key 1 2 Spray nozzle 3 Test panel holder 4 jet (horizontal middle of the jet strikes brush 50 mm above table directly in the brush) a Penetration depth Dimensions in mm 4.8.2. Spray suspension Prepare a suspension consisting of (1.5 ± 0.05 g) of silica powder (silica micro-powder having a mean particle size of 24 per litre of tap water in a μm) container, stirring vigorously. The water temperature shall be between 15 °C and 30 °C. The suspension shall be stirred continuously during the test procedure in such a way that the silica powder does not settle on the bottom of the container. 4.8.3. Test samples The size of the samples shall be 50 mm x 100 mm.
Bristle length (440 ± 20) mm visible Penetration (100 ± 20) mm (see Figure 7) The state of the brushes shall be regularly controlled. At least one monitoring of the total amount of operating hours in use for the brush and an automatic replacement of the brush shall be conducted as soon as 30 operating hours are reached (30 hours equates around 300 test runs since one test takes around 6 minutes). The amount of operating hours shall be reported with the haze increase result of the sample. 4.8.1.2. Spray nozzle: Number 2 (spray alternatively and against the direction of travel of the test panel holder) Material stainless Spread of jet 65° Water flow rate (2.2 ± 0.1) l/min. at (300 ± 50) kPa The two nozzles shall spray alternately and against the direction of travel of the test panel holder. They shall produce the specified spray pattern (see instrument calibration in Figure 8). 4.8.1.3. Test panel holder Feed speed (5 ± 0.2) m/min. Pattern of movement if the brush is rotating clockwise, the right nozzle is spraying and the test panel holder travels from the left side to the right side (and vice versa) Figure 7 Movement pattern of washing brush and nozzle Key 1 2 Spray nozzle 3 Test panel holder 4 jet (horizontal middle of the jet strikes brush 50 mm above table directly in the brush) a Penetration depth Dimensions in mm 4.8.2. Spray suspension Prepare a suspension consisting of (1.5 ± 0.05 g) of silica powder (silica micro-powder having a mean particle size of 24 μm) per litre of tap water in a container, stirring vigorously. The water temperature shall be between 15 °C and 30 °C. The suspension shall be stirred continuously during the test procedure in such a way that the silica powder does not settle on the bottom of the container. 4.8.3. Test samples The size of the samples shall be 50 mm x 100 mm.
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