Bubble Viscometers

  Bubble viscosity tubes can be used to quickly measure the kinematic viscosity of known fluids such as resins and varnishes. The sealed liquid standard viscosity has permanent stability, and cleaning sample tubes is fast and convenient. Glass tubes have no spouts, preventing clogging or incorrect measurements. Under temperature control, it is easy to obtain reproducible readings.

  The direct time method uses a glass tube engraved with three "time lines" to measure "bubble seconds," which is the time required for a bubble to vertically pass a known distance in a glass tube of known diameter. "Bubble seconds" can be converted to Stokes values. The time required for the bubble to rise is directly proportional to the fluid viscosity; the faster the bubble rises, the lower the fluid viscosity. BYK-Gardner bubble viscometers are divided into four groups, arranged by letters on the glass tubes from A5 to Z10, with viscosity ranging from 0.005 to 1000 Stokes.

A-0500
Bubble Viscometer A5-A1 
A set of 5 standard bubble glass tubes A5-A1, 2 grade A empty glass tubes 

Bubble viscosity tube A5 Approximate Stokes value 0.005 
Bubble viscosity tube A4 Approximate Stokes value 0.062 
Bubble viscosity tube A3 Approximate Stokes value 0.140 
Bubble viscosity tube A2 Approximate Stokes value 0.220 
Bubble viscosity tube A1 Approximate Stokes value 0.320 

A-0510 
Bubble Viscometer A-T 
A set of 20 standard bubble glass tubes A-T, 2 grade A empty glass tubes 

Bubble viscosity tube A Approximate Stokes value 0.50 
Bubble viscosity tube B Approximate Stokes value 0.65 
Bubble viscosity tube C Approximate Stokes value 0.85 
Bubble viscosity tube D Approximate Stokes value 1.00 
Bubble viscosity tube E Approximate Stokes value 1.25 
Bubble viscosity tube F Approximate Stokes value 1.40 
Bubble viscosity tube G Approximate Stokes value 1.65 
Bubble viscosity tube H Approximate Stokes value 2.00 
Bubble viscosity tube I Approximate Stokes value 2.25 
Bubble viscosity tube J Approximate Stokes value 2.50 
Bubble viscosity tube K Approximate Stokes value 2.80 
Bubble viscosity tube L Approximate Stokes value 3.00 
Bubble viscosity tube M Approximate Stokes value 3.20 
Bubble viscosity tube N Approximate Stokes value 3.40 
Bubble viscosity tube O Approximate Stokes value 3.70 
Bubble viscosity tube P Approximate Stokes value 4.00 
Bubble viscosity tube Q Approximate Stokes value 4.40 
Bubble viscosity tube R Approximate Stokes value 4.70 
Bubble viscosity tube S Approximate Stokes value 5.00 
Bubble viscosity tube T Approximate Stokes value 5.50 

A-0540 
Bubble Viscometer U-Z6 
A set of 12 standard bubble glass tubes U-Z6, 2 grade A empty glass tubes 

Bubble viscosity tube U Approximate Stokes value 6.27 
Bubble viscosity tube V Approximate Stokes value 8.84 
Bubble viscosity tube W Approximate Stokes value 10.70 
Bubble viscosity tube X Approximate Stokes value 12.90 
Bubble viscosity tube Y Approximate Stokes value 17.60 
Bubble viscosity tube Z Approximate Stokes value 22.70 
Bubble viscosity tube Z1 Approximate Stokes value 27.00 
Bubble viscosity tube Z2 Approximate Stokes value 36.20 
Bubble viscosity tube Z3 Approximate Stokes value 46.30 
Bubble viscosity tube Z4 Approximate Stokes value 63.40 
Bubble viscosity tube Z5 Approximate Stokes value 98.50 
Bubble viscosity tube Z6 Approximate Stokes value 148.00 

A-0560
Bubble Viscometer Z7-Z10 
A set of 4 standard bubble glass tubes Z7-Z10, 2 grade A empty glass tubes 

Bubble viscosity tube Z7 Approximate Stokes value 388 
Bubble viscosity tube Z8 Approximate Stokes value 590 
Bubble viscosity tube Z9 Approximate Stokes value 855 
Bubble viscosity tube Z10 Approximate Stokes value 1066