Intense UV-C light (like the one used inside Li.LAC) has a wearing effect especially on plastics, foams and paint and powder coatings.
We have done multipe long-time exposure tests with various microphones.
The results show that the aging / wearing effect implied by UV-C disinfection inside Li.LAC is negligible compared to the normal aging that happens to the microphones (due to mechanical impacts, dirt, humidity, temperature etc.).
We do recommend that you do a test run with your specific microphone to ensure the compatibilty of the materials with exposure to UV-C light. The microphone membrane should not be exposed directly to UV irradiation. For handheld mics / transmitters we recommend to place them inside Li.LAC with the microphone grille (including foam) attached. For lavalier or headset mics we recommend to cover the membrane with a protection cap or foam windscreen.
Also, we suggest to follow the recommendations of the microphone manufacturers.
Below you can find our test results: changes of frequency response and outer appearance after 500, 1000 and 1500 disinfection cycles inside Li.LAC. 1500 cycles represent multiple years in the real life of a microphone.
We are constantly adding new microphone models to our tests and will post the results here.