A composite material cannot be assessed by weight alone. Processing, joining and later use should form part of material selection.
Describe loads
Record mechanical loads, temperatures and the relevant environment. Fibre direction matters in reinforced parts. Material properties need to match the loading direction and the specific construction.
Consider interfaces
Fasteners and transitions to metal parts influence the overall design. Agree intended joints and inspection methods with the design team and supplier. Review material selection and joining together.
Consider operation
Plan access, damage detection and replacement options. A weight advantage may lose value if inspection or repair becomes disproportionately difficult. The specific component requirements matter more than a general material preference.