BYK-Gardner bubble viscometers are used to quickly determine the kinematic viscosity of known liquids such as resins and varnishes. The bubble viscometer tubes are also described as Gardner-Holdt tubes. The bubble viscometer sets are bubble tubes arranged in the most common viscosity ranges.

# Economically priced

# Certified bubble viscometers are available on request

# Compliant with ASTM methods D1131, D1545, D1725

# Long-lasting shelf life of up to 15 years

# Ideal to measure the kinematic viscosity of resins and varnishes

# Easy to compare and rank the sample with the bubble viscometer standards

Set of 5 Viscosity Tubes with Grades A5, A4, A3, A2, A1

Viscosity : 0.05 - 0.31 St

Certificate : not included

• Set of 5 bubble tube standards A5-A1 (0501-0505)
• 2 empty tubes grade A (0571)
• Manual
• Storage case

Bubble Viscometer Procedure

• Knowing the approximate viscosity, pick four standard tubes closest in viscosity to your sample
• Fill the sample tube with liquid, insert a cork, and then using the tube holder 0577, insert the four lettered tubes and the sample tube into the holder
• Turn over the holder and visually compare what letter best matches the rise time of the bubble in the sample
• The rise time in seconds of the sealed tubes and samples can also be determined using a basic timer
• Please be aware of the following accuracies when performing the test:
• Temperature control: 1 °C = 10 % error
• Verticality control: 5° slant = 10 % error
• Tube I.D. control: 0.1 mm = 2 % error 

ASTM D 1545 Timer Method

• The tube has three amber ring marks at 27, 100 and 108 mm from the bottom. Fill the tube up to the 100 mm line, insert the cork down to the 108 mm line and turn the tube bottom up. Turn the tube around, start the stop watch when the air bubble crosses the 27 mm line and stop when the bubble crosses the 100 mm line.