2 tubes – Scilogex DM1424 Hematocrit-Centrifuge User Manual
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11.2 Tubes
11.2.1 Cleaning and sterilizing tubes
O：Applicable X：Inapplicable
Conditions Materials PA
PC
PP
Clea
ni
ng
Cleaning fluids
Acidic（pH5 or lower） X
X
X
Acidic（higher than pH5 ） O
O
O
Alkaline（higher than pH9 ） O
X
O
Alkaline（pH9 or lower） O
O
O
Neutral（pH7） O
O
O
Warm water(up to 70 )
℃
O
O
O
Ultrasonic cleaning
Neutral detergent（pH7） O
O
O
Sterili
zat
ion
Autoclaving
115℃（0.7kg/cm
2
）
30minutes O
O
O
121℃（1.0kg/cm
2
）
20 minutes
X
O
O
126℃（1.4kg/cm
2
）
15 minutes
X
X
X
Boiling
15 to 30 minutes
O
O
O
Ultraviolet sterilization
200-300nm
X
X
X
Gas sterilization
Ethylene oxide
O
X
O
Formaldehyde O
O
O
PA: Polyallomer PC: Polycarbonate PP: Polypropylene
Table 11.2 Cleaning and sterilizing conditions for tubes
11.2.2 Cleaning PC tubes
PC material is low in chemical resistance against alkaline solutions. Avoid using neutral detergents with
pH higher than 9. Note that pH of some neutral detergents are still higher than 9 even if diluted according
to the manufacturer’s instructions. Use detergent with its pH between 7 and 9.
11.2.3 Autoclaving PA、PC and PP tubes
PA begins softening at about 120 , PC and PP at about 130
℃
℃
. Autoclave PA tubes at 115℃（0.7kg/cm
2
）
for 30 minutes, PC and PP tubes at 121℃（0.1kg/cm
2
）
for 20 minutes. If a certain temperature is exceeded,
the tubes may be deformed.
When use a sterilizing chamber, please operate as follows:
(1) Place tubes in vertical position, mouths upward. If tubes are placed sideways, they may deform into an
oval shape due to gravity.
(2) Remove locking nut and lid to prevent from deformation or rupture.
(3) Wait until the sterilizing chamber cools down to the room temperature before removing tubes.