In this episode, we discuss the scientific and regulatory definitions of flammability and combustibility. The episode details different categories of flammable and combustible liquids based on their flashpoints and boiling points, and explains the classification systems of OSHA, GHS, and NFPA. It emphasizes the importance of understanding the flashpoint and combustibility of materials in various work environments, the implications of aerosolization, and the potential for spontaneous combustion in oily rags. The discussion covers the relevance of different test methods and standards used in hazard communication and risk assessment in industrial settings.00:00 Introduction and Greetings01:13 Scientific Definition of Vulnerability01:53 OSHA GHS Flashpoint Test04:08 NFPA Classification System09:12 Combustible Liquids and Aerosols13:13 Regulatory Standards and Harmonization18:28 Practical Implications and Worker Safety28:00 Understanding Flashpoints and Their Implications28:44 Technical Committees and Standards29:27 Flammability Tests and Methods32:49 Hazard Communication and Process Safety36:51 Challenges with Dust and Nanoparticles43:04 Regulatory Standards and Compliance50:32 Training and Continuous Improvement54:14 Final Thoughts on Hazard Management