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Calculations
Plastic Viscosity (PV), cP = 600 RPM reading – 300 RPM reading
Yield Point (YP), lb./100 ft
2
= 300 RPM reading – Plastic Viscosity (PV)
Apparent Viscosity (AV), cP = 600 RPM reading / 2
Gel Strength, 10 second, lb/100 ft
2
= the maximum dial deection after 10 sec.
Gel Strength, 10 minute, lb/100 ft
2
= the maximum dial deection after 10 min.
ŋ=K F
ŋ= Viscosity (cP)
K= Machine constant for the bob and rotor combination
F= Spring factor
Ɵ= Dial readings
RPM= Rotational speed
Machine constants:
R1B1= 300
R1B2= 2,672
R1B3= 7,620
R1B4= 15,200
R1B5= 349
Clean the viscometer after every test.
1. Remove the sleeve from the rotor.
2. Remove the bob.
3. Once the bob is removed, remove the splash guard and wipe down the
bob shaft. Clean all removed parts with soap and water and dry them
thoroughly.
Keep the instrument upright at all times, especially when cleaning
so that water does not get into the bearings.
Disassembly
Ɵ
RPM
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