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EC number: 265-058-3
CAS number: 64741-57-7
A complex combination of hydrocarbons produced by the vacuum distillation of the residuum from atmospheric distillation of crude oil. It consists of hydrocarbons having carbon numbers predominantly in the range of C20 through C50 and boiling in the range of approximately 350°C to 600°C (662°F to 1112°F). This stream is likely to contain 5 wt. % or more of 4- to 6-membered condensed ring aromatic hydrocarbons.
Results presented as the photoirritation
index = (24 + 72 mean for erythema and oedema after treatment with test
substance and UV irradiation) - (24 + 72 mean for erythema and oedema
after UV irradiation without treatment with test substance).
Mean photoirritation index = 2.8
Time course for findings:
a photoirritation study, 0.3 mL of the test material (F-136, heavy
thermocracked distillate; CAS# 64741-81-7) was dermally administered
(undiluted) to the clipped dorsal skin of 5 New Zealand White rabbits
and covered under occlusive dressing for a period of 1 hour. The animals
were subsequently observed for a period of 3 days.
mean photoirritation index was determined to be 2.8.
was concluded that the heavy thermocracked distillate has a moderate
potential to evoke photoirritation.
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