The choice of material directly impacts the ladder's weight, durability, and application. Aluminum alloy (6061 or 6063-T5) is the industry standard for its lightweight properties and corrosion resistance, making it ideal for general maintenance. However, for electrical work, Fiberglass (FRP) is mandatory due to its non-conductive properties. Ensure the material thickness is sufficient to meet the Load Capacity (Duty Rating), typically ranging from 225 lbs (Type II) to 375 lbs (Type IAA) for industrial use.