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Bostwick Consistometer

24cm, 30cm, 50cm & Starter Kits



The CONSISTOMETER is an instrument used to determine the consistency of viscous materials by measuring the distance that the material flows under its own weight in a given time interval.

The instrument allows producers of such viscous products to predetermine formulas for their product and to standardize production lots.

- Tomato sauces, soups, purees - Preserves, jams, jellies, pickles - Cake fillings, icings, frostings - Baby foods

- Salad dressings, mayonnaise - Gravy, cheese sauces, ready meals, - Cosmetics



The CONSISTOMETER is made of 316 Stainless Steel (Food Grade) stain-resistant material.

It consists of a trough divided into two sections by a gate.

The smaller section serves as a reservoir for the material to be tested.

The larger has laser etched graduated measurement lines along the bottom in one centimetre divisions beginning at the gate.

The gate is spring-operated and is held by a trigger that permits instantaneous release. In operation, the gate slides vertically in the grooves of two posts extending  upward from the sides of the trough.

The L-shaped trigger release hooks over the top of the gate to hold it in a closed position.

Two levelling screws are located at the reservoir end of the trough and a circular spirit level is located at the other end of the trough.



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Specifications 24cm


Engraved Graduations in 0.5 cm Divisions

Wear & Smear Resistant

Assures Accurate Results

Length  355 mm

Through length : 240 mm

Width : 88 mm

Height : 104 mm

ASTM F1080-93

316 Food Grade Stainless Steel

Specifications 30cm


Engraved Graduations in 0.5 cm Divisions

Wear & Smear Resistant

Assures Accurate Results

Length 418mm

Through length 300mm

Width : 88 mm

Height : 104 mm

ASTM F1080-93

316 Food Grade Stainless Steel

Specifications 50cm


Engraved Graduations in 0.5 cm Divisions

Wear & Smear Resistant

Assures Accurate Results

Length 418mm

Through length 500mm

Width : 88 mm

Height : 104 mm

ASTM F1080-93

316 Food Grade Stainless Steel

Starter Kit 24cm, 30cm & 50cm


Bostwick Consistometer


Digital Timer / Stop Watch large display


200ml glass beaker



24cm £404.00 free UK Delivery


Repair, Service and Mechanical Calibration




30cm £454.00 free UK Delivery


Repair, Service and Mechanical Calibration




50cm £595.00 free UK Delivery


Repair, Service and Mechanical Calibration




24cm Starter Kit  £440.00 free UK Delivery

30cm Starter Kit  £490.00 free UK Delivery 50cm Starter Kit  £595.00 free UK Delivery





Place the CONSISTOMETER on a LEVEL surface and adjust the levelling screws until the bubble in the circular level is centred. Check the level by placing another spirit level, on the bottom of the trough about midway along the length of the graduated section.  The two levels should agree.  If they do not, then proceed as follows:


Adjust the levelling screws until the bubble of the level in the trough is centred. Then, bend the pointed, vertical lip of the CONSISTOMETER slightly until the two levels agree.  Do not bend the horizontal part of the lip as this may prevent proper levelling of the instrument.


Close the gate and hook the trigger release over the top.


The material to be tested should be prepared by holding it at a constant temperature (usually 20 degrees C or 68 degrees F) for several hours to assure a uniform temperature throughout.



Fill the reservoir with the material to be tested and level off the top with  a spatula or other straight-edge.


Press down on the trigger to open the gate and, at the same time, start a stopwatch. At the end of the selected time period, determine how far the material has flowed  along the trough.  Take the maximum reading at the centre of the trough and the minimum reading at the edge of the trough, and average the values.  The average value is then compared against a previously determined standard.


When using the CONSISTOMETER, make certain that the gate is fully closed before filling the reservoir.  The reservoir should always be filled completely to the top.


A material should always be tested as quickly as possible after being removed from the constant temperature oven or bath to prevent any consistency changes caused by temperature change or exposure to air.



No maintenance should be necessary except occasional checking of the level, as explained. In Setting up the equipment, and cleaning of the troughs after each test. Should any difficulty occur, contact.

C R Instruments Ltd for further instructions.



ASTM Standard

Test Method for Determining the Consistency of

Viscous Liquids Using a Consistometer


Designation: F1080 – 93 (Reapproved 2008)




This standard is issued under the fixed designation F1080; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.

This standard has been approved for use by agencies of the Department of Defense.



1. Scope

1.1 This test method describes a procedure for the determi- nation of the flow of a standard volume of a semisolid or thick liquid under its own  weight.

1.2 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information   only.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety and health practices and determine the applica- bility of regulatory limitations prior to  use.


2. Summary of Test  Method

2.1 A sample of the material to be tested is poured into a reservoir and the distance of flow in a horizontal direction is read from a ruled track after a fixed time following the materials release from the reservoir.


3. Significance and Use

3.1 This measurement of flow gives results that cannot be predicted with viscosity measurements, due to surface tension and density effects. The measured flow, is related to flow performance of viscous materials sprayed on aircraft surfaces or other large structures.


4. Apparatus

4.1 Consistometer  constructed as described in Annex A1.

4.2 Timing Device  accurate to 61  s.

4.3 Mixer capable of 1600 r/min and fitted with a 25-mm (1-in.) diameter three-bladed propeller.

4.4 Beaker, 500-mL.


5. Procedure

5.1 Bring the material to be tested and the apparatus to the same ambient temperature in the range from 20 to 25°C (68 to 77°F).

5.2 Agitate 250 mL of the material to be tested using the mixer set at 1600 r/min, for 1 min 6 5 s, or until a vortex forms that indicates all of the sample has been exposed to shear. Avoid aeration of the sample as this may cause evaporation of solvents.

5.3 Place the consistometer on a level surface and adjust the leveling screws until the bubble is  centered.

5.4 Close the consistometer gate and set the  trigger.

5.5 Fill the consistometer reservoir with the material to be tested (approximately 100 mL), and level the surface with a spatula or a straight  edge.

5.6 Start the test by simultaneously tripping the consistom- eter gate trigger and starting the timing device. At 5 min 6 1 s (unless otherwise specified), read the distance the material has flowed. Average the result to the nearest 0.5 cm by taking the maximum distance indicated in the center of the trough and adding this to the minimum distance at the edge of the trough and dividing the result by two.


6. Report

6.1 The report shall include the  following:

6.1.1 Material name or reference, type and lot  number.

6.1.2 Average distance of flow to nearest 0.5   cm.

6.1.3 Test  temperature in °C to  61°C.

6.1.4 Duration of test in minutes and  seconds.


7. Precision and Bias

7.1 Precision:

7.1.1 Reproducibility—Viscous materials often vary in con- sistency dependent upon age, temperature, and shear history. Caution shall be exercised between laboratories regarding the history of a sample.

7.1.2 Duplicate results by the same operator on the same sample shall be within 0.5  cm.

7.2 Bias—No statement can be made regarding bias as there are no absolute nor widely accepted standards for the property measured by the consistometer.


8. Keywords

8.1 consistometer; liquids; viscous



(Mandatory Information) A1. CONSISTOMETER


A1.1 Consistometer shown in Fig. A1.1. It consists of the following parts constructed of stainless  steel.

A1.1.1 Reservoir, 4-cm high, 5-cm long, fitted with spring stainless steel trap door on one  side.


A1.1.2 Stainless Steel Track with side walls (24 cm long, 5 cm wide) with ruled markings each 1⁄2     cm.

A1.1.3  Leveling Device, for proper leveling of  track.












FIG. A1.1 Consistometer