Summary The IRSST has produced, in collaboration with professionals from the plastics processing industry, a simple tool for checking the safeguards for horizontal plastic injection molding machines. Developed to support companies in the plastics processing industry in their efforts to prevent accidents involving horizontal plastic injection molding machines, this document can also serve as a basic document in the training offered to the personnel in these companies and to students in plastics processing. However, it does not allow a risk analysis to be done to determine limitations, to identify hazards, and to estimate the risk; in these cases, the standards must be consulted.The safety checklist was based on the recognized North American standard ANSI/SPI B151.1 – 2007.