Healthstream: Hazard Communication (PA) Flashcards | Quizlet Excess PPE can create hazards such as heat stress. Excess PPE can also impair vision, mobility, and communication. The chemical hazard label indicates the class of hazard. It uses three major color-coded categories: Health (yellow), Flammability (red), and Instability (blue). False The label uses one of 9 pictograms to identify the hazard class.