A protective film is formed on the silver surface, allowing the silver luster to be maintained for a long time. The protective film has good solderability and a low electrical contact resistance.
This is a silver discoloration preventive agent (sulfur-based rust inhibitor) designed to protect the surfaces of electrical and electronic components, as well as jewelry and utensils made of silver and silver-plated materials, from various harmful environments. The environments that affect silver and silver-plated surfaces are diverse, but particularly when exposed to atmospheres containing sulfur gas, sulfides form on the silver surface, resulting in a black discoloration of the silver surface and an increase in electrical resistance in electronic components, leading to reduced conductivity. The silver discoloration preventive agent AC20 forms a strong film on the silver surface, protecting it from sulfide and oxidation. Additionally, the protective film has good solderability and low electrical contact resistance. Being water-based and neutral, it is also easy to treat wastewater. AC-20 provides the highest discoloration prevention effect against sulfur gas among the AC series.
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basic information
■ There is no flammability or combustibility as it is a water-based silver discoloration preventive agent. ■ After immersing silver products in AC-20, dry them without rinsing with water, which will form a thick protective film on the silver surface. ■ It has good solderability and is widely used in 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 Instructions 1. Usage concentration: Use as is 2. Temperature: Room temperature to 30°C 3. Time: 1-2 minutes (In winter, if the concentrate becomes cloudy, heat to about 30°C to dissolve uniformly) 4. Drying: After lifting and draining, dry with room temperature air or warm air - Silver material → AGR-100 → rinse with water → AC-20 treatment → drying * A rust prevention film will not form if the surface is not clean. - Silver plating → rinse with water → AC-20 treatment → drying ■ 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 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-20 | This is a water-soluble silver tarnish preventive agent. After immersion treatment, it dries as is and forms a thick protective film. It has the ability to strongly protect the silver surface from harmful atmospheric gas environments. It is used on LED contacts, switch contacts, connector terminals, printed circuit board terminals, and more. |
catalog（2）
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Company information
Asahi Co., Ltd. has been in operation since 1958, and we have always listened to our customers' requests and focused on researching and developing products that meet their needs. So far, we have released numerous products, including cleaning agents for kitchens, 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 traditionally been developed in response to such voices. Moving forward, we will continue to listen to various feedback and develop new products.