The document provides observations of various plastic materials when exposed to heat or fire, including their melting behavior, color of flame, odor of fumes, and speed of burning. Polyethylene (LDPE/LLDPE/HDPE), polypropylene (PP), and ethylene vinyl acetate (EVA) melt quickly and burn with a yellow top and blue bottom flame. They give off a paraffin wax odor and drip quickly. Thermoplastics like ABS and acrylics foam, drip, or burn with smoke, while thermosets like melamine formaldehyde and polyester char without melting. Characteristics such as color, odor, and burning behavior can help identify different plastic materials.