FLOORING ADHESIVES VISCOSITY MEASUREMENT APPLICATIONS

USE 
For linoleum and other types of heavy duty flooring materials. 

ISSUE 
Heavy flooring adhesives generally produce highly variable viscosity test results when using standard viscometers. RST-SST Rheometer in a yield test with modulus calculation (slope of line leading up to yield stress) quickly qualifies the product with consistently repeatable results, thereby providing an improved QC procedure. 

TEST EQUIPMENT 
Instrument: RST-SST Soft Solids Tester 
Geometry: VT-20-10 Vane Spindle 
Software: RHEO 3000

TEST METHOD 
Shear Rate (CSR) control with vane spindle rotating at a low speed. 

PROGRAM 
• One step 
• Start RPM = 0.5 
• End RPM = 0.5 
• Time = 30 seconds 
• Plot = Stress on Y-axis, Strain on X-axis 
• Regression analysis using values up to 40% of maximum shear stress 

Four types of adhesives are evaluated in Figure 1. Modulus determination was set to evaluate up to 40% of peak stress value. The following modulus 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. In Figure 1, Sample D has the lowest modulus and therefore spreads most easily. Samples A and B have the highest modulus and are comparatively stiffer when spreading. 

Figure 1: Evaluation of Four Types of Adhesives. Stress vs. Strain

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