For economic and other reasons, bitumen is sometimes sold combined with other materials, often without being labeled as anything other than simply "bitumen".
fɔːɹ ˌiːkənˈɑːmɪk ænd ˈʌðɚ ɹˈiːzənz, bɪtˈuːmɛn ɪz sˈʌmtaɪmz sˈoʊld kəmbˈaɪnd wɪð ˈʌðɚ mətˈɪɹiəlz, ˈɔfən wɪðˌaʊt bˌiːɪŋ lˈeɪbəld æz ˈɛnɪθˌɪŋ ˈʌðɚ ðɐn sˈɪmpli "bɪtˈuːmɛn".