The following are some methods for distinguishing several types of transparent plastic materials:
| Name | English | Combustion Situation | Burning Flame State | After Fire | Odor |
| --- | --- | --- | --- | --- | --- |
| Polypropylene | PP | Easily combustible | Melts and drips, yellow and blue flames | Continues to burn | Has a petroleum-like smell |
| Polyethylene | PE | Easily combustible | Melts and drips, yellow and blue flames | Continues to burn | Has a paraffin-like smell |
| Polyvinyl Chloride | PVC | Difficult to soften | Produces yellow smoke | Extinguishes when removed from the flame | Has an irritating sour smell |
| POM | POM | Easily melts and drips | Yellow, blue, no smoke | Continues to burn | Has a strongly stimulating formaldehyde smell |
| Polystyrene | PS | Easily combustible | Softens and foams, orange-yellow, thick black smoke | Continues to burn with oily surface | Has a special vinyl-like smell |
| Nylon | PA | Combustion is slow | Melts and drips | Slowly extinguishes | Has a special wool and nail-like smell |
| Polymethyl Methacrylate | PMMA | Easily combustible | Melts and foams, light blue, white, no smoke | Continues to burn | Has a strong fruity and rotten vegetable-like smell |
| Polycarbonate | PC | Easily combustible, softens and foams | Produces a small amount of black smoke | Extinguishes when removed from the flame | Has no special smell |
| PTFE | PTFE | Does not burn | - | - | Releases a pungent hydrogen fluoride smell when burned |
| Polyethylene Terephthalate | PET | Easily softens and foams | Orange, with a small amount of black smoke | Slowly extinguishes when removed from the flame | Has a sour smell |
| Acrylonitrile-Butadiene-Styrene Copolymer | ABS | Combustion is slow, does not drip | Yellow, black smoke | Continues to burn | Has a special smell |
These methods provide useful information about how to differentiate various plastics through their combustion characteristics and odors. Understanding these properties can be particularly helpful in industrial applications or recycling processes.
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