Polyurethane foam based microwave absorbing materials: ushering in a new era of microwave absorbing and processing properties

1、 Microwave absorbing properties of polyurethane foam based materials
1. Absorption effect within a wide frequency range
        Polyurethane foam based microwave absorbing materialIt has good absorption performance in the wide frequency range of 300MH2-18GH2. This means that it can absorb electromagnetic waves from multiple frequency bands, providing users with comprehensive absorption effects.
2. The relationship between the height and absorption performance of wedge-shaped absorbing materials
Sharp edged absorbing material is a common type of absorbing material, and its absorbing performance is mainly related to its height. The ratio of the height l of the spike to the wavelength λ of the incident wave (l/λ) must be greater than 1 in order to effectively absorb electromagnetic waves. Moreover, the larger the value of 1/λ, the better the absorption performance of the sharp edge. Therefore, highly tapered absorbing materials have better absorption performance.
3. The outstanding absorbing effect of rigid polyurethane foam based absorbing materials in high frequency band
In the high frequency band, the rigid polyurethane foam based absorbing material shows its outstanding absorbing effect. This shows that under the action of high-frequency electromagnetic waves, the rigid polyurethane foam based absorbing materials can better absorb electromagnetic waves and provide users with more efficient absorbing solutions.
2、 Physical properties of polyurethane foam based microwave absorbing materials
1. Strength requirements
yes Absorbing materialIn terms of physical performance, strength is an important indicator. The polyurethane foam based microwave absorbing material needs to have sufficient strength to ensure that it will not deform or break during use. Only when the mechanical strength meets the requirements can the absorbing material stably exert its absorbing function for a long time.
2. Long term stability
In addition to strength requirements, absorbing materials also need to maintain stable performance during use, without deformation or powder loss. Only in this way can the effectiveness of the absorbing material be maintained in a good state for a long time, providing users with reliable absorbing solutions.

3、 Flame retardancy of polyurethane foam based microwave absorbing materials
When designing a anechoic chamber, the flame retardancy requirements for absorbing materials are very strict. The polyurethane foam based microwave absorbing material should have good flame retardancy to prevent accidents caused by material burning in high temperature environment. The guarantee of this flame retardant performance is to ensure the safety and reliability of the echo free darkroom.
4、 Processing properties of polyurethane foam based microwave absorbing materials
For the processing of polyurethane foam based microwave absorbing materials, the enhanced reaction injection molding (RRIM) technology can be used to achieve continuous production. This technology not only ensures the strength and performance stability of the materials, but also can process different shapes and specifications of microwave absorbing materials according to the needs of users. Different shapes of absorbing materials, such as pointed, conical, conical, arc-shaped, and flat plate shapes, can meet the specific needs of users.
in summary, Polyurethane foam based microwave absorbing materialHas broadband absorption performance and excellent high-frequency absorption effect. Its physical performance requirements include strength and long-term stability, while flame retardancy and processability are also important factors that cannot be ignored. As an advanced absorbing material, polyurethane foam plastic based absorbing material provides users with more choices and better solutions.