COVID-19Protection
Halfmask BUT–H2

Disinfecting the Surfaces

The product must be disinfected before further use; the individual steps and alternatives are described below.

Filter

Ideally, the filter should be heat-treated (by using tools such as a flatiron) or replaced with a new one; the procedure has to be chosen according to the printing material used.

Disinfecting the Printed-Out Parts

During our testing cycle, PLA plastics were immersed in undiluted SAVO Originál (a 4.7% sodium chlorite-based disinfectant) for more than 48 hrs, with no structural or aesthetic changes revealed at the end. Thus, the printed PLA components can be readily sunk in diluted solutions of SAVO Originál or other similarly composed disinfectants. In SAVO Originál, we recommend the sodium chlorite concentrations of between 0.5% to 0.1%, meaning that the dilution rates range between 1:6 and 1:40.

Ethanol or isopropyl alcohol are also applicable, at concentrations from 70% to 90%.

The disinfection of half masks has been systematically discussed on the PrusaPrinters company’s website, https://help.prusa3d.com/cs/article/dezinfekce-prusa-oblicejovy-stit_125458.

Due to the porosity of a 3D-printed component, the real disinfection time should be longer than that recommended in the literature for nonporous materials.

When handling the disinfectant, always follow the manufacturer’s instructions. If you immerse the half mask components, leave them in the (lukewarm) solution for at least 5 minutes, though the ideal process takes 15 mins. To ensure reliable disinfection, clean any dirt from the mask before using the agent.

The filter holder is to be disinfected by being immersed in a convenient solution (Savo Originál diluted at 1:6; ethanol; or isopropyl alcohol); the suitability of a disinfectant depends on the concrete printing material.

Sleeve

The glove has to be either treated with a disinfecting solution or replaced with a new one.

Responsibility: doc. Ing. Václav Kaczmarczyk, Ph.D.