Agent Name

Asphalt, oxidized

CAS Number

64742-93-4

Formula

Unspecified

Major Category

Other Classes

Synonyms

Asphalt oxide; Blown asphalt; Bitumens, oxidized; [ChemIDplus] 50 Pen; Asphalt; Bitume souffle; Bitumen; Bitumen, semi blown; Blastbitumen; Bitumen 100/40; Bitumen 85/25; Bitume 35/50; Blown Bitumen; Oksidert Bitumen; Oxid-Bitumen; Geblasenes Bitumen; Oxidised Asphalt Grades (105/35, 85/25); Oxidised Asphalt Grades (20/30, 65/50, 85/25, 85/40, 110/30, 115/15); Oxidised Asphalt Grades (20/30, 40/50, 60/70); Oxidised Asphalt Grades (85/25, 100/40); Oxidised Bitumen; Oxidized Bitumen; [IUCLID]

Category

Polycyclic Aromatic Hydrocarbons

Description

Viscous semi-solid to solid; [EPA ChAMP: Screening Level Hazard Characterization: Asphalt] Dark brown to black solid; [Johns Manville MSDS]

Sources/Uses

Oxidized asphalt is produced by blowing air through asphalt at high temperature; it is commonly used for built-up roofing and asphalt shingles. [Reference #2] Used in the chemical, fuel, paints-lacquers-varnishes, paper-pulp-board, textile processing, road making, civil works, roofing, and construction industries; Used for sealing and insulating buildings, as an adhesive, construction materials additive, and as a dust-binding, coating, insulating and impregnating agent; [IUCLID] Used to make rubber and plastic products; [EPA ChAMP: Screening Level Hazard Characterization: Asphalt] The two main asphalt products are for paving and roofing; Also used in asphalt based paints for corrosion protection of metals, in lining public works structures (e.g., irrigation canals), in adhesives in electrical laminates, and as a base for synthetic turf; Typical uses for oxidized asphalt include roofing, pipe coating, Portland cement pavement, hydraulic applications, and paint manufacturing; [Reference #1]

Comments

"TSCA Definition 2008: A complex black solid obtained by blowing air through a heated residuum, or raffinate from a deasphalting process with or without a catalyst. The process is principally one of oxidative condensation which increases the molecular weight." [ChemIDplus] The fumes produced from heating (often necessary in applications such as paving) are considered the major occupational hazard of these complex mixtures; [EPA ChAMP: Screening Level Hazard Characterization: Asphalt] Irritation of the eyes, nose, throat, and skin, coughing, rashes, nausea, decreased appetite, headache, and fatigue are some of the effects reported from occupational exposure in various sectors of the asphalt industry; [Reference #1] Releases hydrogen sulfide gas when heated; An irritant; Exposure to high vapor concentrations may cause nausea, dizziness, and drowsiness; [Johns Manville MSDS] See "Asphalt fumes."

Reference Link

INCHEM CICADs: ASPHALT (BITUMEN) - 2004

Exposure Assessment
Reference Link

Airborne Exposures to Polycyclic Aromatic Compounds Among Workers in Asphalt Roofing Manufacturing Facilities.

Links to Other NLM Databases
Toxicity Information

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Chemical Information

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Related Information in HazMap
Processes

Industrial Processes with risk of exposure: