At Schlegel Electronic Materials Inc. we have an unwavering commitment to the safety of our customers and our co-workers during the COVID-19 virus pandemic. SEM is a worldwide company and our facilities in Asia, Europe, and the United States are working in concert to provide production support as needed. We are currently operating at 100%

PermaFlow Filter


Schlegel‘s unique porous film provides air/sound permeability and water/dustproof function at the same time, which prevents inundation and contamination inside of the case.

Perfect for a number of applications, and can be die cut and molded into various sizes and shapes as materials for their sound, internal and external pressure control filters mobile phones, smart phones, digital cameras and other devices.

Product Lines

Sound Permeable Filter for Mobile Devices

  • Acoustic performance oriented product for microphones in mobile devices.
  • Acoustic loss in frequency ranges of human voice (low frequency) is within 2dB.

Air Permeable Filter for Internal Pressure Control

  • Prevents damage of waterproof case, caused by internal pressure fluctuation.
  • Product lines include 280˚C heat-resistant filter.