The RootselaarGroup was founded in 1957 and it is a family owned group of companies. Members of The Group are Tankbouw Rootse ... laar, Cryovat, Cryotech Asia, Cryotech Middle East, Hadetec, Greenmac and Kooiman Apparatenbouw. We offer a complete service in pressure vessels and cryogenics from design to manufacturing and also maintenance. 60 years of experience, special product expertise and applicable skills are available. read more