The color code chart for lifting slings is mainly used to distinguish their load capacity and to ensure the safety and efficiency of lifting operations. The following is a common color code chart for lifting slings and tonnage:

Purple: Represents a maximum load of 1 ton, suitable for light lifting operations.
Green: Represents a maximum load of 2 tons, suitable for medium-weight lifting needs.
Yellow: Represents a maximum load of 3 tons, suitable for lifting heavier objects.
Gray: Represents a maximum load of 4 tons, suitable for lifting larger weights.
Red: Represents a maximum load of 5 tons, suitable for lifting heavy equipment.
Brown: Represents a maximum load of 6 tons, suitable for lifting super-heavy objects.
Blue: Represents a maximum load of 8 tons, suitable for lifting needs of extra-large tonnage.
Orange/Red-orange: Represents a maximum load of 10 tons and above, specially designed for lifting extra-large equipment.