聚四氟乙烯

polytetrafluoroethylene (PTFE), trademarked as Teflon

to congregate / to assemble / to mass / to gather together / to amass / to polymerize

four / 4

fluorine (chemistry)

second of the ten Heavenly Stems 十天干[shi2 tian1 gan1] / second in order / letter "B" or Roman "II" in list "A, B, C", or "I, II, III" etc / second party (in legal contract, usually 乙方[yi3 fang1], as opposed to 甲方[jia3 fang1]) / ethyl / bent / winding / radical in Chinese characters (Kangxi radical 5) / ancient Chinese compass point: 105°

turning stroke (in Chinese characters) / see also 折[zhe2]

turning stroke (in Chinese characters), aka 折[zhe2]

ethylene / vinyl

alkene