Solid and dry content

Purpose

The solid or dry content of pigment and pigment slurries directly impacts the products’ purchase price. Paper lose elasticity as their dry content increases, which generally impairs their converting properties.

The dry content should be kept within a range corresponding to an equilibrium moisture at 23 ºC and 50% relative humidity. Depending on the paper quality, this corresponds roughly to a water content of 5% - 7%

Principle

It is a common practice to dry a weighed sample at 105 ºC in a drying oven or on a drying balance, until the weight is constant. Alternatively, a Karl-Fischer titration can be perform.