Spray Rating Test Method

Test piece preparation:

Test piece (Size: 18CM*18CM)

Test procedure:

• As AATCC 22 required, we put the test piece to the humidifying treatment more than 4 hours, which under the environment of standard temperature of21±1℃and relative humility of 65±2℃.
• After the humidifying treatment, the test piece clamped by the holder on the support at a 45°, and we pure 50ml water into the funnel rapidly steadily in order to keep drenching constantly. When the water is used up, we can observe the test piece.
• According to description of spray rating to assess its grade of wet but without the intergrade.

Spray rating:

Grade 1: All of the surface is wet.

Grade 2: Half of the surface is wet. It usually means the sum of small and disconnected areas of wet.

Grade3: Only small and disconnected areas of wet on the surface.

Grade4: The surface appears water drop but not wet.

Grade5: The surface is neither wet nor water drop.

Test result:

The test result should include the following message:

1. The illustration of the test procedure according to the standard.
2. Atmospheric conditions.
3. Water temperature.
4. Spray rating of each test piece.
5. Experimental date.