Brookfield DV-III Ultra Rheometer - Manual (Page 53)

Brookfield Engineering Laboratories, Inc. Page 53 Manual No. M98-211-E0912
Plastic Viscosity (cP or mPa•s)
Yield Stress (Dynes/cm2 or N/m2)
Confidence of Fit (%)
4. Power Law
The Power Law equation is τ =
k D n where:
τ = Shear Stress
D = Yield Stress (stress at zero shear rate)
k = Plastic Viscosity
n = Shear Rate
The calculated parameters for this model are:
Flow Index (no units)
Consistency Index (cP or mPa•s)
Confidence of Fit (%)
5. IPC Paste Analysis
This method is intended to calculate the Shear Sensitivity Factor and the 10 RPM Viscosity value
of pastes. A prime example of its use is in the solder paste industry, thus the name IPC (Institute
for Interconnecting and Packaging Electronic Circuits).
The Paste equation is: η =
kR n where:
η = Viscosity (cP)
k = Consistency Multiplier
R
= Rotational Speed (RPM)
n = Shear Sensitivity Factor
The calculated parameters for this model are:
Shear Sensitivity Factor (no units)
10 RPM Viscosity (cP or mPa•s)
Confidence of Fit (%)