TRIMET Aluminium SE | 14,472 followers on LinkedIn. TRIMET – Aluminium lightens your life | As an innovative, medium-sized, family-owned company, TRIMET develops, produces, recycles, casts, and sells modern light-metal products made of aluminium at eight locations. A staff of about 2,300 plus 900 employees in the joint venture BOHAI TRIMET Automotive ensure, together with our customers, that automobiles are more economical, aircraft are lighter, wind turbines and electricity plants are more efficient, buildings are more modern, and packaging is more ecological.