TWI Frequently asked question
by Sam Rostami
Interaction between microwave radiation and the molecular dipoles of the adhesive material is the primary mechanism for absorption of microwave energy. Domestic microwave ovens operate at 2.45GHz, a frequency specifically selectedto couple with the natural absorption frequency of water molecules. Generally speaking, polar materials are more likely to absorb microwave energy. However, it is not only the presence of dipoles but also their strengths, orientationsand their ability to move with the applied field which are important factors in their susceptibility to absorb microwave energy.
Further information
What is a microwave?
Why are microwave-transparent adhesives important?
Are polymeric adhesives microwave transparent?
How do impurities in an adhesive affect microwave attenuation?
