Hitachi CR22N Instruction Manual page 106

9. Tubes and Bottles
Conditions and life expectancy of tubes and bottles
CAUTION：Do not use tubes/bottles that have exceeded their life expectancy. Failure to do so
could result in damage of tubes/bottles and the rotor and the centrifuge.
The life expectancy of tubes/bottles depends on factors such as the characteristics of
samples, speed of the rotor used, and temperature.
Always check for deterioration and damage (cracks, deformation, and so on) on
tubes/bottles before using them. Do not use the tubes/ bottles if you find such a
problem.
The life expectancies of plastic tubes and bottles depend on factors such as the characteristics of samples,
speed of the rotor used, and temperature.
When plastic tubes/bottles are used for centrifugation of ordinary aqueous samples (between pH5 and pH9),
their life expectancies are specified as follows.
When operated for 1 hour at the maximum speed:
Tubes (PA, PC, PP) ······································
Thick-walled tubes and bottles (PA, PC, PP) ······ 50 operations
himac 50 TC tubes and tubes on the market ······
The life expectancies of the PC bottles are specifically specified as follows according to the pretreatment
conditions such as cleaning and sterilization.
Cleaning and
sterilization
Sample
Neutral (PH7)
Alkalescent (PH7 to 9)
Do not use crazed (cracked) tubes or bottles.
The life expectancy of a plastic tube/bottle as the above is an approximate guide. We do not warrant the life
expectancies of tubes/bottles.
Gas sterilization and cleaning
with warm water
50 operations
30 operations
9-2
5 operations
1 operation
Autoclaving at 121°C
for 20 min.
10 operations
5 operations