true||/spreadratecalcbanner.jpg||transparent

true||open_sansbold||left||2.2em||112%||#FFFFFF

Spread Rate Calculator

true||open_sansitalic||left||1.5em||150%||#FFFFFF

Instructions and access

true||text||open_sansthin*open_sansregular*open_sansitalic||.813em||170%||#515151||1*1*1

Determination of the hiding power of paint can be no more accurate than the measurement of the thickness of the film. It is very difficult to make an accurate measurement of a paint film for which the hiding power is to be determined. This web-based program - Ti-Pure™ Spread Rate Calculator - is used to perform calculations to give accurate hiding power information. *To utilize the Ti-Pure™ Spread Rate Calculator the weighed hiding method must be used. This method based on determination of wet film thickness is satisfactory when (a) the drying rate of the paint is slow enough to permit accurate weighing of the wet film and (b) the paint densities are known. *The method for determining hiding power uses the reflectance readings taken on paint films applied to Leneta opacity charts - readings of reflectance over the white area (R) and black area (Ro) of the chart, and the substrate reflectance (Rg). Substrate reflectance is the initial reflectance of the white area of the chart, measured prior to application of the paint film. The method incorporates calculations using the reflectance readings and the equations of Kubelka-Munk to calculate scattering power (SX) and R infinity (R∞ , or the reflectance of a film of infinite thickness). Wet film thickness, X, expressed in mils, is calculated from the density of the paint, the area of the drawdown and the tare weight of the wet drawdown. From values of SX and X, the scattering coefficient S in units of scattering per mil of paint can be calculated. When the TiO2 content of the paint is known, the scattering coefficient S may be expressed as S(TiO2) in units of square meter/gram of TiO2.

false||text||open_sansregular||.813em||170%||#515151||1*3*2

true||text||open_sansregular||.813em||170%||#515151||1*1*1

These two documents provide background on and demonstration of the Spread Rate Calculator: *Background Document *Spread Rate Calculator Instructions.

false||text||open_sansregular||.813em||170%||#515151||1*1*1

false||text||open_sansregular||.4em||170%||#515151||1*1*1

false||text||open_sansregular||.813em||170%||#515151||1*1*1

false||text||open_sansregular||.813em||170%||#515151||1*1*1

false||text||open_sansregular||.813em||170%||#515151||1*1*1

false||text||open_sansregular||.813em||170%||#515151||1*1*1

false||text||open_sansregular||.813em||170%||#515151||1*1*1

what?