Synthetic phenolic resin as a catalyst, the polycondensation reaction is easy to control, a resin obtained low viscosity, fast curing, easy to remove the catalyst. Reference to the amount of 1% to 1.5% phenol. The catalyst may also be used as a water-soluble urea-modified phenol-formaldehyde adhesive, the cured product was a pale yellow, resin remaining in the barium salt of divalent and does not affect the chemical stability of the dielectric.
Reagents for the analysis, but also for the separation and manufacture of precipitated barium sulfate salts, measuring carbon dioxide in air. Quantitative chlorophyll. Refined sugar and animal and vegetable oils. Boiler water cleaner. Pesticides. Rubber industry.