a product to be used in neutral scale prevention after the acid washing of boiler with a range from large construct to small parts and especially aqueous scale prevention agent can be widely used without regard to the kind of treatment target.   Product Name Appearance Liquid Type Main Use YG-10 Liquid Alkali • After chemical washing of boiler & pressurized vessel, neutral scale prevention • After chemical washing of general steel pipe, one-time scale prevention YG-20 Liquid Alkali • After chemical washing of cooling water plant & heat exchanger, neutral scale prevention YG-30 Liquid Alkali • Long-term aqueous scale prevention agent for general steel(pipe, various structures, steel reinforcing, containers) • After high pressure washing, aqueous scale prevention agent • Scale prevention treatment before coating YG-40 Liquid Alkali • Scale prevention agent for full water reservoir of boiler in rest YG-50 (Thawing Spray) Liquid Neutral • Corrosion preventive agent (ethylene glycol additive) • Anti-freezer additive   Product Name Using Method Characteristics Packaging YG-10 • deposition: treat it with 10% aqueous solution for 30~60 min. (room temperature~60℃) • Circulation: treat it with 5% aqueous solution for 1~2 hour (room temperature~60℃) (no washing) • Strong de-scaling • Re-scaling is little in humid area. • No gas generation in the reaction with acid(de-scaling agent) 20㎏ YG-20 • treat it with 5% aqueous solution for 30~60 min. (room temperature) • Washing is not required and operation is possible in the state of continuous addition. • No corrosion in material • No rust stain generation • Excellent scale prevention 20㎏ YG-30 • Treat it with 50%~solution by spraying, coating, deposition, etc.( (room temperature~60℃). • Easy treatment by aqueous scale prevention agent • Excellent scale prevention • Good adherence to coating 20㎏ YG-40 • Add 300~600 ppm (0.05~0.06%) of boiler pipe flow and use. • No corrosion in steel (all materials of boiler) • Scale is prevented by vapor of agent without the contact of liquid agent 20㎏ YG-50 (Thawing Spray) • Add 3~5% and use. • No corrosion in all kinds of metals 20㎏