Some synthetic polymers such as polyethylene and polypropylene are alkanes with chains containing hundreds or thousands of carbon atoms.
sˌʌm sɪnθˈɛɾɪk pˈɑːlɪmɚz sˈʌtʃ ɐz pˌɑːlɪˈɛθɪlˌiːn ænd pˌɑːlɪpɹˈoʊpəlˌiːn ɑːɹ ˈælkeɪnz wɪð tʃˈeɪnz kəntˈeɪnɪŋ hˈʌndɹɪdz ɔːɹ θˈaʊzəndz ʌv kˈɑːɹbən ˈæɾəmz.