Home page

Silvering technology for mirror glass

Release Date:

2021-09-29 17:47

Source:

Glass cleaning: After cutting the glass to the required dimensions, rinse both sides with tap water. Then apply an aqueous solution of ferric red pigment to the surface to be coated; once dry, wipe off the pigment and rinse thoroughly with water. Next, gently scrub the coating side with a dilute stannous chloride solution. After washing, rinse away any residual stannous chloride with water. Finally, give the glass a final rinse with clean water—distilled water is preferred.

Raw Materials and Requirements

　　The glass shall be flat and flawless, with no bubbles in the center;

　　Silver nitrate, with a purity of 99.5% or higher;

　　Ammonia solution, with a concentration of 25–28%;

　　Potassium sodium tartrate, chemically pure.

　　Method of preparation

　　Glass cleaning: After cutting the glass to the required dimensions, rinse both sides with tap water. Then apply an aqueous solution of iron red pigment to the surface to be coated; once dry, wipe off the pigment and rinse thoroughly with water. Next, gently scrub the coating side with a dilute stannous chloride solution. After washing, rinse away any residual stannous chloride with water. Finally, give the glass one last rinse with clean water—distilled water is preferable.

　　Silvering: Place the thoroughly cleaned glass flat on a horizontal wooden frame or strip. Mix one part silver solution with one part reducing solution, then pour the mixture onto the glass, ensuring it is just enough to coat the surface without dripping—approximately 20 milliliters per square meter. Allow the reaction to gradually form a silver mirror on the glass; discard any excess solution, rinse with water, and apply a 0.01% gelatin solution before drying. Once dry, coat the surface with a layer of red iron oxide primer or another anti‑rust paint to produce a finished mirror.

　　Liquid formulation

　　Silver solution: 2,500 mL distilled water (boiled and cooled water is also acceptable), 25 g silver nitrate, and 18.5 mL ammonia solution (add until the solution becomes clear as a result of the chemical reaction).

　　Reducing solution: 2,500 mL of distilled water (boiled and cooled water is also acceptable), 25 g of potassium sodium tartrate; heat the solution to clarify, then add 0.5% silver nitrate. Filter the resulting solution and set aside for use.

　　Gelatin solution: 1,000 mL water, 10 g gelatin; dissolve by gentle heating in a water bath.

　　Apply an iron-red primer mixed with an appropriate amount of turpentine solution.

　　The imaging principle of a mirror

　　Whether it is a plane mirror or a non‑plane mirror (concave or convex), light rays are reflected according to the law of reflection. Once these reflected rays enter the eye, they form an image on the retina. In a plane mirror, when a parallel beam of light strikes the surface, the entire beam is reflected in a parallel manner, and the resulting image is identical to what the eye perceives.

Keywords:

We warmly congratulate our company on successfully achieving mass production of third-generation eco-friendly mirrors and flat solar concentrators!

None