ASTM D6739 Standard test method for Silica – pH Value
ASTM D6739 measures the pH of a silica solution or dispersion. The pH level of silica is known to affect the vulcanization of some rubber compounds. The values stated in SI are considered standard.
Scope:
The ASTM D6739 test method determines the pH of a 5% silica/water mechanical dispersion and is indicative of the relative acidity or basicity of the silica. When the pH is less than 8.5, the production of amorphous silica is promoted.
Procedure:
Inthis ASTM D6739 test method a pH meter, mortar, and pestle are used. The silica is granulated to a fine powder and transferred into a glass beaker. Two buffer solutions with pH values of 4.0 and 7.0 are used to calibrate the pH meter. After each test, the electrode is washed with distilled water. Record the pH to the nearest 0.05 pH unit.
Read More :- ASTM D6845-12 Test Method for Silica, Precipitated, Hydrated—CTAB (Cetyltrimethylammonium Bromide) Surface Area
Specimen:
In ASTM D6738, particle size ranges from 20 nm to 200 nm, by controlling the temperature of the reaction.
Data:
The volatile material is given by the following equation:
% Volatiles = [ (W₂-W₃)/(W₂-W₁)] ×100
where,
W= weight of the pan
Read more: ASTM D6738 Method for Precipitated Silica – Volatile Content
Conclusion:
ASTM D6738 includes determining volatile content in precipitated silica.
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