Standard Test Method for Total Ash in Wet Blue or Wet White

Importancia y uso:

4.1 This test method is useful in determining the approximate amount of nonvolatile inorganic material in wet blue. This may be in the form of salts or oxides of the elements. In a mixed-chrome tannage, the approximate percentage of other elements in the wet blue may be determined by subtracting the chromic oxide that may be conveniently determined on the ash. (See Test Method D6714.)

4.2 The specified temperature of 600 °C is high enough to produce a reproducible result but it does not completely dehydrate such oxides as aluminum oxide (Al₂O₃) and chromic oxide (Cr₂O₃). Likewise, such salts as sulfates and phosphates may be incompletely dehydrated, and if alkalis and chromium are present simultaneously, oxidation to chromate may occur. Therefore, caution is advised in drawing conclusions based on quantitative relations of the elements.

Subcomité:

D31.02

Referida por:

D6714-16R21

Volúmen:

15.04

Número ICS:

59.140.30 (Leather and furs)

Palabras clave:

aluminum oxide; ash; blue stock; chrome content; chromic oxide; total ash; wet blue; wet white;