Created in 1961, SIGMA, with its 50 employees and a current turnover of FRF 40 M, is specialised in the field of composite materials for public transport.

Certified in 1996, Sigma works in compliance with the ISO 9001 quality system.

Sigma supplies its customers with ready-to-install complete systems or sub-systems combining composite technology with that of other materials such as aluminium, stainless steel, plastics, etc.