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Flooring Adhesives

Flooring Adhesive Image
For linoleum and other types of heavy duty flooring materials. 

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. 

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

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

• 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. 

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

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