Porous Plastic Air Freshener Wick Surface tension, pore size, porosity and material types are the critical factors considered in the design of wick. With extensive wicking experience in the development of air freshener wick, Blinex has developed the final air freshener wick featured as a type of polyethylene offering a combination of small pore size and high porosity, including an innovative molded geometry for a tamper-proof design complying with child safety regulations.