Recommended Cleaning Procedure
The methods listed below, seem to be the most promising to kill the virus and are currently being verified by the professionals. Hospitals and other medical workplaces can use their professional sterilizing equipment to properly sterilize (disinfect) the face shields before using them again. A test on a single shield is recommended to verify possible damage of the sterilization.
All tests were performed by leading Czech laboratories and hospitals to ensure conclusive and reliable results. Detailed info about the testing facility and conditions of the test are described between the tables.
The tests were conducted on the Prusa Face Shields printed from Prusament PETG Orange. The official design of the Face Shield is available at PrusaPrinters. We cannot guarantee the methods will work on a different design (geometry) or material due to different properties (e.g. PLA will melt if exposed to high temperatures).
|METHOD||CONDITIONS||EFFECTIVE AGAINST||VERIFICATION STATUS|
|Hot Air Dryer||65 °C (149 °F), 60 mins||bacteria, viruses||Verified by SYNLAB1|
|WHO Handrub disinfection*||99% IPA, 5 mins||bacteria, viruses||Verified by UCT2|
|Isopropanol (IPA)||96%, 5 mins||bacteria, viruses||Verified by UCT2|
|Isopropanol (IPA)||75%, 5 mins||bacteria, viruses||Verified by Labtech3|
|Sodium Hypochlorite (household bleach)||min. 0.01 % of hypochlorite (e.g. SAVO 1:10), 2 mins+||bacteria, viruses||Verified by Labtech3, SYNLAB1|
|UV-C||radiation, 30W, wavelength below 280 nm, 15 mins||bacteria, viruses||Verified by SYNLAB1|
|Ethanol||70-80% max**, 5 mins||bacteria, viruses||Verified by UCT2, Labtech3|
|IPA steam (70 %, 30 % water)||45-65 °C (113-149 °F), 30-90 mins, patent info||bacteria, viruses||verification in progress|
|PVP-I (iodine disinfection)||4%, 5 mins||bacteria, viruses||verification in progress|
|Hydrogen Peroxide||6-25%, 5 mins||bacteria, viruses||Verified by ZUUSTI5|
|Soap water||repeated washing, 5 mins||bacteria, viruses||verification in progress|
|Ozone||strong oxidating effects, depends on the chamber||bacteria, viruses||verification in progress|
|Gamma radiation||strong ionizing radiation, depends on the chamber||bacteria, viruses||verification in progress|