A substance that makes solid materials more susceptible to wetting by water. By reducing its surface tension or interfacial tension, water can spread on the surface of the solid material, or penetrate the surface, and wet the solid material.
Usually some surfactants, such as sulfonated oil, soap, powder BX, etc. Also available are soy lecithin, thiols, hydrazides, and thioacetals. Wetting agents are increasingly used by the ceramics industry. Generally, a poly-oxyethylene alkylate ether with high water hardness is commonly used. And sulfonated oil, soap, etc. have medium wetting performance, excellent detergency and solubilizing tendency.