Long rigid chains work best because they get many carbon-fluorine molecules to the surface, where they can do their jobs, and keep a large part of the chain embedded in a substrate.

• 碳链越长、越坚固，抗污效果就越好，因为这样一来，分子表面就有很多的碳?氟分子（此即发挥抗污作用的区域），也可以让大半碳链深埋在涂布的基体里。