Standard Test Method for Volume Nonvolatile Matter in Clear or Pigmented Coatings

Importancia y uso:

4.1 This test method is intended to provide a measure of the volume of dry coating obtainable from a given volume of liquid coating. This value is useful for comparing the coverage (square feet of surface covered at a specified dry film thickness per unit volume) obtainable with different coating products.

4.2 For various reasons the value obtained may not be equal to that predicted from simple additivity of the weights and volumes of the raw materials in a formulation. One reason is that the volume occupied by a solution of resin in solvent may be the same, greater, or less than the total volume of the separate ingredients: such contraction or expansion in resin solutions is governed by a number of factors, one of which is the extent and direction of spread between solubility parameters of the resin and solvent.

4.3 The spatial configuration of the pigment particles and the degree to which the spaces between the pigment particles are filled with the binder also affect the volume of a dry coating formulation. Above the critical pigment volume concentration, the apparent volume of the dry film is significantly greater than theoretical due to the increase in unfilled voids between pigment particles. The use of volume nonvolatile matter values in such instances should be carefully considered as the increased volume is largely due to air trapped in these voids.

Subcomité:

D01.21

Referida por:

D3105-17R24, D6266-00AR23, D3794-22, D5286-20, F0718-22, C1483_C1483M-17R22, D6577-24, D6093-97R22, D6083_D6083M-24, D3960-05R18, D6694_D6694M-15R23, F0940-99R19E01, D6947_D6947M-16R23, D6763-16R22, D5146-10R19, D2832-92R16

Volúmen:

06.01

Número ICS:

87.040 (Paints and varnishes)

Palabras clave:

volume nonvolatile content;