Standard Practice for Measuring MEK Resistance of Ethyl Silicate (Inorganic) Zinc-Rich Primers by Solvent Rub

Importancia y uso:

4.1 Ethyl silicate zinc-rich primers cure by the reaction of the vehicle with moisture, thereby providing a binder for the zinc. As relative humidity and temperature vary, so does the rate of cure. A certain minimum degree of cure is necessary prior to topcoating. It has been shown that the degree of cure of ethyl silicate zinc-rich primers can be measured by the chemical changes occurring using diffuse reflectance infrared spectroscopy.2 This solvent rub test has been shown to correlate well with the infrared spectroscopic results of some two-component ethyl silicate inorganic zinc systems.

4.2 The degree of cure rating (Resistance Rating in Table 1) required prior to the application of specific topcoats must be agreed upon before the practice is used.

Subcomité:

D01.46

Referida por:

F2831-19R24, D6577-24, D5498-12AR18, D5402-19R24, D3276-21

Volúmen:

06.02

Número ICS:

87.040 (Paints and varnishes)

Palabras clave:

curing characteristics; double rub method; drying or curing; ethyl silicate (inorganic) primer; MEK (methyl ethyl ketone) resistance; methyl ethyl ketone; primer; solvent rub method; visual examination; zinc-rich primer;