Water Repellency
Drops of standard test liquids consisting of specified proportions of water andisopropyl alcohol (reagent grade) by volume, are placed on the substrate’s surface and observed for wetting. The water repellency rating is the highest numbered test liquid which does not absorb into the substrate surface.
Water Test Liquid
W 100% Water
1 – 90/10 Water/Isopropyl Alcohol
2 – 80/20 Water/Isopropyl Alcohol
3 – 70/30 Water/Isopropyl Alcohol
4 – 60/40 Water/Isopropyl Alcohol
5 – 50/50 Water/Isopropyl Alcohol
6 – 40/60 Water/Isopropyl Alcohol
7 – 30/70 Water/Isopropyl Alcohol
8 – 20/80 Water/Isopropyl Alcohol
9 – 10/90 Water/Isopropyl Alcohol
10 – 100% Isopropyl Alcohol
Oil Repellency
Drops of standard test liquids, consisting of a selected series of hydrocarbons with varying surface tensions, are placed on the substrate surface and observed for wetting. The Oil Repellency Rating is the highest numbered test liquid which does not wet the substrate surface.
Oil Test Liquid
1 – Kaydol® white mineral oil
2 – 65/35 Kaydol® white mineral oil/ n-hexadecane
3 – n-hexadecane
4 – n-tetradecane
5 – n-dodecane
6 – n-decane
7 – n-octane
8 – n-heptane