A blowing agent is usually a solid compound that is capable of creating a foam cell through a phase change or hardening process in various materials that go through a chemical transformation, such as polymers, plastics, metals, and other composites. They are usually used when the blow-up material is still in a liquid state. The blow-up agents can also be included in the mixing of the final product in order to have a smooth consistency. There are different types of blow-up agents, each with its own unique purpose and use.
Polyethylene (PE) blowing agents are widely used in the polyethylene industry for various purposes, including both weight reduction and surface quality improvement. They are generally used for both in-situ and extrusion blasting, as PE bubbles are easy to shape and eliminate. The major benefit of using blow-up polyethylene agents for weight reduction is that they can dramatically reduce both gas and fluid consumption, especially during lean manufacturing processes where mass production is key. As a result of low gas emissions, they help in the total elimination of carbon dioxide from the plant.
Oxides of Mercury (Og) blowing agents are the most commonly used oxide of mercury chemical blowing agents. The reaction between mercury and hydrochloric acid produces a reaction that produces excess alkaline gas in an oxidase reaction. This excess alkaline gas in an oxidase reaction creates a product that is very useful in controlling the rate of corrosion of metal alloys. It is also used in the production of oxygen gasless welding gas in welding torches. Exothermic blowing agents are chemical foaming agents. During combustion, they create exothermic reactions that produce heat energy. Some of the most widely used exothermic blowing agents are boron carbide and silica. The silica form of exothermic blowing agents is often mixed with the boron carbide to produce the material foam. The two types of exothermic agents have different uses.
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