26
Occupational Safety and Health Administration guidelines on occupational exposure to
formaldehyde in claim airborne formaldehyde concentrations exceed permissible exposure limits
area should be prescribed as a control area, marked out with signs and symbols of the region,
only appropriately trained personnel. We must review and observe current regulations;
m
、
Connect wire of the heating device with outside socket for Microbiological Safety Cabinet.
n
、
After 25% of the formaldehyde is depolymerized, turn on the cabinet blower 10 s - l5 s.
Paraformaldehyde depolymerization 50%, repeat the above steps after the 75% and 100%. In
case the Microbiological Safety Cabinet blower does not work, use the auxiliary blower or fan to
promote air circulation inside the cabinet, or to extend the disinfection time, exceed the following
step p recommended time;
o
、
Disconnected the power of the heating plate and the heating device for paraformaldehyde ;
p
、
Microbiological Safety Cabinet keep for at least 6h, preferably overnight;
q
、
Prepare according to step g, power the heating device containing ammonium bicarbonate and
Microbiological Safety Cabinet to make ammonium bicarbonate vanish. Like operating with
paraformaldehyde , after 25% ammonium bicarbonate vanish,turn on the Microbiological Safety
Cabinet blower for 10 s - l5 s, if the fan does not work auxiliary fan or a fan to promote air
circulation in cabinet, or neutralization time extends to at least 6 h;
r
、
Microbiological Safety Cabinet for at least 1 h after unfolding sealing film;
s
、
The hose exhaust neutral formaldehyde out, tear plastic covers of biological safety cabinet vent ,
connect the hose with vent and seal, if the hose works, before the cabinet-through plastic window
cover will be inhaled, plastic cover ofthe front window working hole is cut out one or two small
openings (about 15 cm × 15 cm), make fresh air go into the cabinet, but neutral formaldehyde
from the Microbiological Safety Cabinet exhaust via hose.
You can use other methods to eliminate formaldehyde as long as the method safe and
effective to eliminate formaldehyde gas.