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their life expectancies are defined as follows.
Be operated at the maximum speed:
High quality tubes (PA、PC、PP): 30-50 operations
Ordinary tubes (PA、PC、PP): around 10 operations（Using in low speed can extend
the tube life）.
Life expectancy of tubes also depends on the pretreatment conditions such as
cleaning and sterilization, lifetime can be cut down.
Notice: Do not use damaged or cracked tubes.
12. Calculate Relative Centrifuge Force (RCF)
Relative Centrifuge Force (RCF) can be determined with the following calculation
formula. RCF=1.118×r×n2×10-5
R—rotating radius, unit: cm ;n—rotating speed, unit: rpm
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