What are the different types of purging compounds available in the market?

There are two major classes of purging compounds in the market. One is referred to as mechanical or abrasive purging compounds. These are compounds where the cleaning process is based on the mechanical action of hard particles, e.g., glass fibers. The other type of purging compounds is chemical purging compounds. With these, the cleaning process relies on chemical additives that initiate some form of chemical reaction. A third, less commercially available category, typically called a hybrid, is a combination of mechanical and chemical characteristics. The supply form of purging compounds can be either ready-to-use, where the product can be used directly from the package, or a concentrate which is then typically combined with some type of resin at the production facility before being used.