Shenzhen Alu Rapid Prototype Precision Co., Ltd.

Prototype robots from the leading humanoid robotics companies (as of late 2025) are predominantly made of the following materials:

1.Structural frame/chassis:

A.Aerospace-grade aluminum alloys (e.g., 7075, 6061) – lightweight and high strength-to-weight ratio

B.Magnesium alloys – used in some newer designs for even lower weight

C.Carbon-fiber-reinforced polymers (CFRP) – increasingly common in limbs and torso panels (especially Tesla Optimus Gen 2, Figure 02/03, Agility Digit, Boston Dynamics Atlas new electric version)

2.Actuators and joints:

A.High-performance electric motors with proprietary windings

B.Harmonic drives or cycloidal gearboxes made of specialized steels

C.Titanium is used in high-load joints (e.g., Boston Dynamics’ new electric Atlas, Apptronik Apollo, Sanctuary Phoenix)

3.Outer shells / cosmetic covers:

A.ABS or polycarbonate plastics

B.Soft silicone or TPU skins for face and hands (especially on Ameca, C.Figure 02/03, and Tesla Optimus Gen 2.5+ prototypes)

D.Fabric or neoprene covers on some models (Tesla Optimus, 1X Neo)

4.Hands and end-effectors:

A.Combination of aluminum/titanium skeleton + soft polymer or silicone “skin”

B.Tendon-driven designs often use high-strength polymer cables (Dyneema or similar)

5.Batteries and electronics housings:

A.Lithium-ion or lithium-polymer cells in custom packs

B.Usually housed in magnesium or CFRP enclosures

In short:

 modern 2024–2025 humanoid robot prototypes have largely moved away from the heavy steel structures of older robots and are now built primarily from aerospace-grade aluminum, magnesium, titanium, and carbon-fiber composites, with increasing use of soft polymers/silicone for human-like appearance and safer interaction.