The difference between microwave foaming and chemical foaming methods

Introduction chemical foaming and microwave foaming

The world of foam manufacturing is a fascinating case study in material science and engineering. The basic chemistry of the process has progressed over time from a variety of from-scratch recipes that relied on bubbles to be blown into a liquid polymer by hand into more modern, automated processes that rely on foaming agents to produce billions of tiny bubbles uniformly dispersed throughout the polymer. The two most important developments in this area are chemical foaming and microwave foaming. Although these methods have some similarities, their differences are even more interesting:

the difference between chemical foaming and microwave foaming

  • Chemical foaming is more expensive than microwave methods foaming
  • Chemical foaming is more widely used than microwave foaming

Microwave foaming

Microwave foaming is not a chemical reaction; it’s a process where the polymer is heated in the presence of a chemical agent. The heat applied to the polymer causes it to expand and form bubbles. These bubbles then trap air inside, which gives you your foam. Melamine foam is a product type of microwave foaming, but there are several other materials that can also be used for this technique.

microwave foaming

The mechanism of microwave foaming

Microwave heating is a rapid, non-thermal process that only heats the surface of the material. The electromagnetic field excites molecules in the foodstuff to vibration, causing them to collide with each other and transfer energy. This causes a rise in temperature within seconds or even less than a second.

Chemical foaming

Chemical foaming is the process of expanding polymers by injecting them into a liquid bath. The polymer is injected into the liquid bath at a high pressure, causing it to expand rapidly and form bubbles. The liquid used in chemical methods is often water, alcohol or glycol. The liquid bath often contains surfactants (detergents) that help stabilize bubbles formed during expansion and prevent them from coalescing back together as they rise through the surrounding liquid.

Chemical foaming

Injection Molding

Injection molding is a common process for making plastic parts. A mold is created, and molten plastic is injected into it. The mold shapes the plastic into the desired shape. This process can be used to make parts from a wide variety of plastics, including ABS (used in car interiors), PVC (used in window frames), and polycarbonate (which is scratch-resistant).


The process of extrusion is used to create a wide variety of products, including pipe fittings, sheetmetal and plastic parts. In the case of foam extrusion, a resin (and often an additive) are fed into the system at high pressure. The material enters a barrel that heats it enough to make it expand as it exits through an orifice (or die). This expansion creates foam cells that can be used for cushioning or other purposes.

Mixing process

Mixing is the process of combining two or more substances together. It is used in the production of polymers, foams and plastics.

In chemical methods, mixing occurs because the chemical reaction causes different substances to combine into new compounds or mixtures. The mixing effect can be enhanced by using a high-speed mechanical mixer to disturb the mixture during heating and cooling stages so that rapid reaction takes place between molecules at various points in space.

there are many ways to form polymers.

There are many ways to form polymers. The most common method is foaming with heat. Foaming with chemical agents is also popular, but it’s not as effective or efficient as foaming with microwave energy or injection molding. When you’re working on a project that requires polymer foam, it’s important to know how these different methods work and what their pros and cons are so that you can make an informed decision about which one will work best for your needs.


In order to make the structure of polymers more perfect, we have developed a variety of methods.

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