2. The scientific name of 2.TPX is poly -4- methylpentene-1. Monomer 4- methylpentene-1 is a highly crystalline transparent plastic with a specific gravity of 0.83, which is the lightest among all plastics. Low surface hardness and non-toxic. The light transmission performance is between plexiglass and polystyrene. Combustion characteristics can burn, and continue to burn slowly after leaving the fire, with melting and dripping. Advantages The light transmittance of TPX does not change with the change of processing conditions, nor does it change with the thickness of the product, so it is suitable for making transparent products. Its rigidity is great, and when the temperature is higher than 100℃, its rigidity exceeds that of polypropylene. Overtakes PC at 150℃.