Electrolytic manganese metal is the elemental metal extracted from manganese ore by acid leaching and then sent to an electrolytic cell. The appearance is like iron, irregular flake, solid and brittle, one side is bright, the other side is rough, silver white to brown, and silver gray after processing as powder; It is easily oxidized in air, dissolves and replaces hydrogen when encountering dilute acid, and can decompose water and release hydrogen when slightly higher than room temperature.

Function: Increase the hardness of the metal material

Equation: Mn+2H20(heat)=Mn(OH)2+H21

Alias, sodium hydroxide, commonly known as caustic soda, caustic soda, caustic soda (Hong Kong also known as "Koch's"), is a highly corrosive alkali, generally flake or granular form, easily soluble in water and form an alkaline solution, and moisture, easy to absorb water vapor in the air. Sodium hydroxide also has different applications and is one of the necessary chemicals in the chemistry laboratory, and is also one of the common chemicals. Pure products are colorless transparent crystals. Industrial products contain small amounts of sodium chloride and sodium carbonate, which are white opaque solids. There are blocky, flake, granular and rod-like. The product that forms a concentrated solution is the common name liquid alkali. Solid alkali is very hygroscopic, easily soluble in water, and strongly exothermic. It is soluble in ethanol and glycerol. In the air, the dew will eventually dissolve completely into a solution. Strong alkalinity, strong corrosion to skin, fabric, paper, etc.

Chemical formula: NaOH 

Density :2.130g/cm3.

Melting point: 318.4℃.  

Boiling point: 1390℃.