Medical surgical masks are suitable for the basic protection of medical staff or related personnel
as well as the protection against the spread of blood, body fluids and splashes during the invasive operation.
The protection level is medium and has certain respiratory protection performance.

The Kn95 mask can be used for breathing protection of certain particulate matter
such as dust generated by grinding, cleaning and processing of minerals, flour and certain other materials.
It is also suitable for liquid or non-oily, non-hazardous volatilization caused by spraying

At present, there is no clear conclusion on the optimal wearing time of N95 masks abroad, including WHO, and China has not yet made relevant regulations on the use time of masks
The results show that the filtration efficiency of N95 masks is still above 95% for 2 days, and the respiratory resistance does not change much
When the following conditions occur, the mask should be replaced in time:

During Sunday night’s All-Star Game, the Los Angeles Lakers’ Kobe Bryant suffered a broken nose and a concussion thanks to hard foul from Miami’s Dwyane Wade. Bryant, though, was back on the court on Wednesday, his injured schnozz covered by a plastic face mask. In 2005, Brendan Koerner celebrated the inventor of the protective basketball mask, a little-known orthotist named Gerald McHale who helped players like Chris Webber and a high-school-aged Bryant play through facial injuries. The original piece is reprinted below. You don’t have to be Wilt Chamberlain to get into the Basketball Hall of Fame. If you don’t have a sweet turnaround jumper from 18 feet, the best route to the Hall is fatherhood. Daniel Biasone, aka the “father of the 24-second clock,” made the cut. So did Ferenc Hepp, the “father of basketball in Hungary,” and Chuck Taylor, the father of Converse All Stars. But there is one very deserving father whom the hall has thus far neglected to enshrine: Gerald McHale, the man […]