This set of information sheets is an updated version of “Information sheets on natural refrigerants” published by the Nordic Chemicals Group in 2008. It consists of 31 information sheets on natural refrigerants, covering a broad field of technical information. Natural refrigerants may already replace the group of potent greenhouse gases called HFCs for a number of applications, and the technology is under continuous improvement. The use of natural refrigerants differ from using HFCs in many ways, affecting a variety of aspects related to system design and operation, safety requirements etc. The objective of these information sheets is to provide information about the possibilities and limitations related to these fluids, and to make technical knowhow and practical experience available for system designers and installers, in order to promote more use of natural refrigerants.