A protective film is formed on the silver surface, which maintains the luster of the silver for a long time. The protective film has good solderability and low electrical contact resistance.
AC-70 is designed to maintain resistance to sulfur gas like AC-20 and to form a thin, uniform protective film. Due to the thin and uniform protective film, there is no unevenness in thickness even when applied to glossy silver or semi-gloss silver plating. It is a silver discoloration preventive agent used to protect the surfaces of electrical and electronic components, as well as jewelry and artifacts, from various harmful atmospheres. The environments affecting silver and silver-plated surfaces are diverse, but particularly when exposed to atmospheres containing sulfur gas, sulfides are generated on the silver surface, causing the appearance of the silver surface to turn black, increasing electrical resistance in electronic components, and reducing conductivity. The silver discoloration preventive agent AC-70 forms a strong film on the silver surface, protecting it from sulfurization and oxidation. Additionally, the protective film has good solderability and low electrical contact resistance. Being a neutral water-based solution, it is also easy to treat wastewater. Like AC-20, AC-70 provides a high discoloration prevention effect against sulfur gas within the AC series.
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basic information
■ There is no flammability or combustibility as it is a water-based silver discoloration inhibitor. ■ After immersing silver products in AC-20, dry them without rinsing with water to form a thick protective film on the silver surface. ■ It has good solderability and is widely used for various electrical and electronic components. ■ Properties Appearance: Emulsifiable transparent to milky white liquid Specific gravity: 1.00 ± 0.02 (25°C) Solvent: Water pH: 7.0 ± 0.5 (concentrate) ■ Usage 1. Usage concentration: Use as is 2. Temperature: Room temperature to 30°C (In winter, if the concentrate becomes cloudy, heat it to about 30°C to dissolve) 3. Time: 1 to 2 minutes 4. Drying: Ventilated or hot air drying - Silver material → AGR-100 → rinse with water → AC-70 treatment → rinse with water → dry * A rust-proof film will not form if the surface is not clean. - Silver plating → rinse with water → AC-70 treatment → rinse with water → dry ■ Packaging: 18kg * For more details, please contact us or download the catalog.
Price range
P2
Delivery Time
P3
Applications/Examples of results
There are many achievements in rust prevention and discoloration prevention of silver products, such as electrical and electronic components like connectors and LEDs for heavy electrical equipment.
Line up（1）
| Model number | overview |
|---|---|
| AC-70 | This is a water-soluble silver tarnish preventer. It is used for a wide range of electronic components. AC-70 is suitable for glossy silver plating as it washes away excess components and eliminates unevenness on the treated surface by rinsing and drying after processing. |
catalog（1）
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Company information
Asahi Corporation has been listening to our customers' requests and striving to develop products that meet their needs since our founding in 1958. So far, we have released a variety of products, including cleaning agents for kitchen areas, car shampoos and waxes for car wash machines, as well as copper and silver tarnish prevention agents. In recent years, there has been a growing demand for environmentally friendly chemicals, leading to an increase in requests for degreasers, cleaning agents, tarnish prevention agents for semiconductors, and high heat-resistant tarnish prevention agents that do not use strong acids or strong alkalis. Our products have been developed in response to such voices from the beginning. We will continue to listen to a variety of feedback and develop new products.