Flooring Adhesive

Laboratory Viscometer Application Data Sheet

USE

For linoleum and other types of heavy duty flooring materials.

ISSUE

Heavy flooring adhesives generally produce high variable and time-consuming viscosity testing results when tested with standard viscometers and accessories. However, the R/S+SST in a yield test with modulus calculation (slope of line leading up to yield stress) quickly (30 seconds) qualifies the product with consistently reproducible results, thereby providing an improved QC procedure.

Test Equipment:

• Instrument: R/S+SST Rheometer (Soft Solids Tester)
• Geometry: V20-10 Vane Spindles
• Software: RHEO2000

TEST METHOD

Controlled by Shear Rate (CSR)

PROGRAM

• One step,
• Start RPM = 0.5
• End RPM = 0.5
• Time = 30 seconds
• Plot = Stress on Y1, Strain on X, no Y2
• Regression using values up to 40% of maximum shear stress

Four types of adhesives are evaluated in the above graph. Modulus determination was set to evaluate up to 40% of peak stress value.

The following values were reported:

• Sample A: G = 35550 Pa
• Sample B: G = 34419 Pa
• Sample C: G = 28862 Pa
• Sample D: G = 16652 Pa

The vane spindle geometry easily accommodates adhesives of varying consistency and produces a repeatable curve that allows for quick pass/fail test.