Ụlọ ọrụ anyị wuru na 1992, na-emepụta tube roba eke na butyl n'ime tube nwere ikike mmepụta kwa afọ 10,000 PC, tube roba eke na butyl n'ime tube fọrọ nke nta ka ọ bụrụ ọkara ọkara.Anyị nwere ihe karịrị ndị ọrụ 150 na ndị injinia 20, a na-ekwe nkwa ịdị mma anyị na anyị ebupụla karịa mba na mpaghara 80.