ISO-Standardized Tests

EXPRO’s liquid, along with five other products on the market, has undergone two internationally standardized tests: Spray/Wetting Test (ISO 4920:2012) and Contact Angle/Roll-off Test (ISO 19403-7). Both tests were performed and administered by RISE – Research Institutes of Sweden on behalf of and according to instructions from Brunngård Group. To achieve comparable and neutral test results regarding the liquid’s water-repellent properties, the instructions on each product packaging were disregarded. All products have been tested under the same conditions as follows:

• The same amount of liquid, 3 g for polyester and 6 g for cotton, from each product was applied to a surface of approximately 20 x 20 cm.
• The product was applied at room temperature by spraying it in the center of the material from a distance of 15–20 cm.
• The treated material was left to dry at room temperature at least 16 hours before analysis.
• All products were applied using neutral and identical bottles and nozzles.
• To ensure accuracy and validity, each test was replicated multiple times.

SPRAY TEST / Wetting Test (ISO 4920:2012)

Evaluates the water-repellent properties of textiles.

Materials tested: Cotton canvas and polyester shell fabric.

Procedure: A total of 250 ml of deionized water at room temperature was applied to the material using a spray nozzle over a duration of 25–30 seconds. The material was positioned at a 45-degree angle relative to the spray nozzle, with a distance of 150 ± 2 mm between the nozzle and the material. Measurements were performed at room temperature, and the results were evaluated through visual inspection, using a scale of 0–5 as per the standards of the American Association of Textile Chemists and Colorists (AATCC).

Results: EXPRO demonstrated superior water-repellent properties for both cotton and polyester fabrics.

ROLL-OFF TEST (ISO 19403-7)

Evaluates the ability of water droplets to bead and the angle at which the water droplet rolls off the surface.

Materials tested: Cotton canvas and polyester shell fabric.

Procedure: A 30 μL drop of deionized water at room temperature was carefully applied to the material. The material was inclined and the entire process was recorded on video at a resolution of 2.5 frames per second. The roll-off angle was determined as the angle of inclination at which the outer edge of the drop moved at least 1 mm. To ensure accuracy and validity, each test was replicated five times for each material and product.

Results: EXPRO demonstrated superior water-repellent properties for both cotton and polyester fabrics.