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Brookfield AMETEK

Dishwasher Detergent

Laboratory Viscometer Application Data Sheet

USE

To be used in a dishwasher to help clean dishes.

Method 1

Test Equipment:

  • Spring Torque Range: HB
  • Spindle: HB-3 Spindle
  • Speed, rpm: 5, 10, 50, 90, 130, 170, 210 and 250 rpm.
  • Temperature: Room Temperature (70-72F).

* While a particular model/version may be used as an example in this method, any current or past model/version from the same series may also be used. Please consult a sales associate to discuss the most current instrumentation and software available.

We used a Brookfield HBDV-III+ Viscometer with Rheocalc v3.1 software for automated instrument control and data acquisition. We ran our test at room temperature (70-72F), in a 600-mL beaker. We used an HB-3 spindle, immersed to its immersion mark. Three trials were run to ensure repeatability. Each trial was run in a new portion of the sample. Representative data from the analyses are shown in Figure, 1 below:


Figure 1: Dishwasher Detergent at 25C

Figure 1 shows that the viscosity of the Dishwasher Detergent decreased as the shear rate increased. This behavior is known as "shear- thinning." Results over our range of shear rates were all on-scale, that is between 10 and 100% of full-scale range torque.

Method 2

Test Equipment:

  • Spring Torque Range: HA
  • Spindle: SC4-27 / 13RPY Sample Chamber
  • Accessories: Small Sample Adapter TC-502P Programmable Refrigerated Bath
  • Speed, rpm: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210 and 220 rpm.
  • Temperature: 25C

* While a particular model/version may be used as an example in this method, any current or past model/version from the same series may also be used. Please consult a sales associate to discuss the most current instrumentation and software available.

The Small Sample Adapter may be used with various Brookfield Viscometers or Rheometers. In our example, we used a Brookfield HADV-III+, with Rheocalc v3.1 software for automated instrument control and data acquisition. Our test temperature of 25C was maintained by connecting the Small Sample Adapter water jacket to a Brookfield TC-502P Programmable Refrigerated Bath. Three different portions were tested, to ensure repeatability. A syringe was used to measure 10.4 mL of the sample and dispense it into the chamber. The Small Sample Adapter can be an extremely valuable accessory, especially if you would like to use much smaller samples than required to perform Method 1. Representative data from the analyses are shown in Figure 2, below:


Figure 2: Dishwasher Detergent at 25C

Figure 2 shows that the viscosity of the Dishwasher Detergent decreased as the shear rate increased. This behavior is known as "shear- thinning." Results over our range of shear rates were all on-scale (i.e., between 10 and 100% torque). Our results were repeatable.

Method 3: Yield Stress Test

Test Equipment:

  • Spring Torque Range: RV
  • Spindle: Vane Spindle V-73, Immerse to the Primary Immersion Mark
  • Speed, rpm: 1 rpm
  • Temperature: Room Temperature (70-72F).

We used the Brookfield RVYR-1 Rheometer, with EZ-YieldTM v1.4 software for automated instrument control and data acquisition. The YR-1 performs yield stress tests, which determine the stress that must be applied to make a material flow. The corresponding apparent yield strain is the deformation at which the sample structure breaks down - and at which the sample flows. The sample was squeezed out of its bottle into a 250-mL beaker, where it was tested. The Vane spindle was immersed to its primary immersion mark. The Vane spindle was immersed into a new portion of the sample for each trial. Representative data from the analyses are shown in Figure 3, below:


Figure 3: Dishwasher Detergent at room temperature (70-72F).

Figure 3 shows Stress (Pa) vs. Apparent Strain (rad) of the Dishwasher Detergent at 1 rpm. On-scale results were obtained while testing with the RVYR-I and the V-73 vane spindle, at 1 rpm. The stiffness or firmness of the material is reflected in the slope or steepness of the stress-strain curve. The yield stress is the maximum stress (around 37 Pa), in each run. The results were repeatable.