Description

1. Bath Make-up:

Name	Quantity	Unit
LW-53	20	g/L
Sulphuric Acid Reagent	15	g/L
Stannous Sulfate (SnSO4)	6–13	g/L (light color: 6-8 g/L, dark color:8-13 g/L)
Deionized Water	Balance

2. Operating Conditions:

Name	Quantity	Unit
Sulphuric Acid (H2SO4)	15-23	g/L
SnSO4 (stannous sulfate)	6-15	g/L
Temperature	20±3	℃
Voltage	18±2	V
Time	Depends on the depth of color

3. Solution Maintenance:

1) Analyze the concentration of free sulphuric acid, stannous sulfate and total acid daily. Maintain the concentration of free sulphuric acid above 15g/L and total acid around 30g/L. To increase the stannous sulfate by 1 kg, add 1.5 kg of LW-53.

2) The pure water is suggested be added slowly with stirring to prevent the hydrolysis of stannous sulfate and cause solution turbidity.

3) There will be white precipitations in long-term production. So the bath should be filtered and cleaned regularly.

4. Packaging and Storage:

Package: Plastic woven bag (20kg/bag)  

Storage: Suggested to store in cool, dry and well ventilated place; away from fire and heat source， and avoid light storage.