Chemical blowing agents are substances used in the production of foamed materials, such as plastics and rubber. They generate gas when heated or chemically reacted, creating bubbles that expand the material and give it a lightweight, porous structure. Common examples include azodicarbonamide and sodium bicarbonate. These agents are essential in various industries, including packaging, automotive, and construction, as they improve insulation properties and reduce material usage. The choice of blowing agent can affect the final product's density, strength, and thermal properties, making it crucial for manufacturers to select the appropriate type for their specific applications.