News at Sefco 2019. Opening of Sefco Asia. Hong Kong 2018. Opening of Sefco China, Shanghai April 2017. Sefco is ISO 9001:2015 certified September 2015. Manufacturing and Test facility   With a total area of nearly 1,800 square meters, the new production and testing in Therwil, was put into operation in autumn 2015. The plant was designed and constructed to optimized workflow and cryogenic testing.