ASTM D2697 PDF
or both, the greater will be the deviation of the coverage calculation (This is also true to a lesser degree with Test Method D). For various reasons the. ASTM D 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. Comparison of the ASTM D Method and the film thickness method for obtaining volume solids 3. Bibliography.
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This provides a more accurate determination of void volumes than can be obtained via liquid displacement. Prior to this method a satisfactory procedure for measuring percent volume nonvolatile did not exist see Note 11 in Practice D 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.
Astk 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.
ASTM D – 03 Standard Test Method for Volume Nonvolatile Matter in Clear or Pigmented Coatings
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. It is the responsibility of the user of this standard to establish appropriate safety and v2697 practices and determine the applicability of regulatory limitations prior to use.
Purging the gas pycnometer flushes these materials from the film. An interlaboratory study to establish the precision of this test method included a water-reducible exterior latex paint and three automotive coatings that included a solvent-reducible primer surfacer, water reducible astn surfacer, water reducible enamel topcoat, and acrylic dispersion lacquer topcoat.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Link to Active This link will always route to the current Active version of the standard. Earlier collaborative studies included a gloss enamel, a flat wall paint, a gloss house enamel, an industrial baking enamel, satm interior latex paint, and an ast latex paint.
Helium solves this problem since, as a gas, it qstm penetrates and displaces air, water, and volatile solvents even at low pressures. Such contraction or expansion of 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. Historical Version s – view previous versions of standard. The approach used should provide faster and more accurate results than the use of the liquid displacement technique in Test Method Dparticularly for coatings that are difficult to wet or that contain voids, cracks or other defects.
Above the asgm 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.
Historical Version s – view previous versions of standard.
Link to Active This link will always route to the current Active version of the standard. In Practice D paragraph 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.
Volume Nonvolatile Matter in Clear or Pigmented Coatings – ASTM D2697
With high poly vinyl chloride PVC films, however, liquid displacement of air voids takes place with difficulty even under high pressures. 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. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
This value is useful for calculating the volatile organic content VOC of a coating and could be used to estimate the coverage square feet of surface covered at a specified dry film thickness per unit volume obtainable with different coating products. 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: Referenced Aetm purchase separately The documents listed below are referenced within the asym standard but are not provided as part of the standard.
Since the actual coverage of a coating includes the void volume and the porosity of the film, the coverage value calculated from this method will be inaccurate by that amount, that is, the actual coverage will be greater.
The values given in parentheses are for information only. The values given in parentheses are mathematical astn to SI units that are provided for information only and are not considered standard.
The improvement in accuracy stems from the superior ability of helium gas under pressure to penetrate very small pores and surface irregularities in dried films.