Asphalt Chemische Eigenschaften,Einsatz,Produktion Methoden
ERSCHEINUNGSBILD
DUNKELBRAUNER ODER SCHWARZER FESTSTOFF.
ARBEITSPLATZGRENZWERTE
TLV: Asphalt- (Bitumen-) Rauch als benzoll?sliches Aerosol 0.5 mg/m?(als TWA); Krebskategorie A4 (nicht klassifizierbar als krebserzeugend für den Menschen); (ACGIH 2005).
MAK: (Dampf und Aerosol) Hautresorption; Krebserzeugend Kategorie 2; (DFG 2005).
AUFNAHMEWEGE
Aufnahme in den K?rper durch Inhalation der Rauche.
INHALATIONSGEFAHREN
Verdampfung bei 20°C vernachl?ssigbar; eine gesundheitssch?dliche Partikelkonzentration in der Luft kann jedoch beim Dispergieren oder Erhitzen schnell erreicht werden.
WIRKUNGEN BEI KURZZEITEXPOSITION
WIRKUNGEN BEI KURZZEITEXPOSITION: Die Substanz reizt die Augen und die Atemwege. Beim Erhitzen führt die Substanz zu Verbrennungen der Haut.
WIRKUNGEN NACH WIEDERHOLTER ODER LANGZEITEXPOSITION
Rauche der Substanz sind m?glicherweise krebserzeugend für den Menschen.
LECKAGE
Fest werden lassen. Verschüttetes Material in Beh?ltern sammeln.
Chemische Eigenschaften
Asphalt fumes are flammable when hot and
may contain hydrogen sulfide and human carcinogen, such
as benzo(a)pyrene and dibenz(a,h)anthracene. Fumes generated
during the production or application of asphalt (a
dark-brown to black cement-like substance manufactured
by the vacuum distillation of crude petroleum oil).
Verwenden
Acid, alkali, and waterproof coatings; black
varnishes, lacquers, baking enamels, and japans;
wire-insulation compounds; linoleum and floor tile;
paving; insulation; diluent in low-grade rubber
compounds; possible source of gasoline, fuel oil,
and metallurgical coke.
Definition
An asphaltic material or solidified
hydrocarbon found only in Utah and Colorado. One
of the purest (9.9%) natural bitumens. Said to be the
first solid hydrocarbon to be converted to gasoline.
Allgemeine Beschreibung
Dark liquid. A mixture of heavy hydrocarbon residues including saturated and unsaturated hydrocarbons and aromatic hydrocarbons (Reactive Groups 16, 28, and 29). Depending on the blend includes various heterocyclic hydrocarbons containing sulfur and nitrogen.
Air & Water Reaktionen
Insoluble in water.
Reaktivit?t anzeigen
ASPHALT burns readily when heated or ignited in the presence of air or oxygen. May be incompatible with strong oxidizing agents like nitric acid. Charring may occur followed by ignition. Mostly unreactive in other settings. Not affected by aqueous solutions of acids, alkalis, most oxidizing agents, and most reducing agents.
Hazard
Irritant, skin sensitizer.
Health Hazard
Acute exposure to asphalt fumes
causes irritative effects. Certain extracts of
asphalt have caused a carcinogenic skin
response in experimental animals.
The chemical composition of vapors and
fumes from asphalt products is variable and
depends on the crude petroleum source, type
of asphalt, temperature, and extent of mixing.1
Therefore, the adverse effects from asphalt
may also vary considerably depending on the
source of exposure.
Brandgefahr
Flash point data for ASPHALTUM are not available; however ASPHALTUM is probably combustible.
Industrielle Verwendung
Asphalt refers to varieties of naturally occurringbitumen. Asphalt is also produced as a petroleumbyproduct. Both substances are black andlargely soluble in carbon disulfide. Asphalts areof variable consistency, ranging from a highlyviscous fluid to a solid.Asphalt is derived from petroleum in commercialquantities by removal of volatile components.It is an inexpensive construction material used primarily as a cementing andwaterproofing agent.Asphalt is composed of hydrocarbons andheterocyclic compounds containing N2, sulfur,O2; its components vary in molecular weightfrom about 400 to 5000. It is thermoplastic andviscoelastic; at high temperatures or over long loading times it behaves as a viscous fluid; atlow temperatures or short loading times as anelastic body.
Sicherheitsprofil
Suspected carcinogen
with experimental carcinogenic and
tumorigenic data. A moderate irritant. May
contain carcinogenic components.
Combustible when exposed to heat or
flame. To fight fire, use foam, CO2, or dry
chemical.
m?gliche Exposition
Occupational exposure to asphalt
fumes can occur during the transport, storage, production,
handling, or use of asphalt. The composition of the asphalt
that is produced is dependent on the refining process
applied to the crude oil, the source of the crude oil and the
penetration grade (viscosity) and other physical characteristics
of the asphalt required by the consumer. The process
for production of asphalt is essentially a closed-system distillation.
Refinery workers are therefore potentially exposed
to the fumes during loading of the asphalt for transport
from the refinery during routine maintenance, such as leaning
of the asphalt storage tanks, or during accidental spills.
Most asphalt is used out of doors, in paving and roofing.
The workers’ exposure to the fumes is dependent on environmental conditions, work practices, and other factors.
These exposures are stated to be generally intermittent and
at low concentrations. Workers are potentially exposed also
to skin and eye contacts with hot, cut-back, or emulsified
asphalts. Spray application of cut-back, or emulsified
asphalts may involve respiratory exposure also.
Versand/Shipping
UN1999 Tars, liquid including road oils and cutback
bitumens, Hazard Class: 3; Labels: 3-Flammable
liquid.
Inkompatibilit?ten
Asphalt and bitumen dust may form
explosive mixture with air. Note: Asphalt becomes molten
at about 93 C. Asphalt burns readily when heated or
ignited in the presence of air or oxygen. May be incompatible
with strong oxidizing agents like nitric acid. Charring
may occur followed by ignition. If heated sufficiently or
ignited in the presence of air, oxygen or strong oxidizing
agents, can burn exothermically. May be ignited by strong
oxidizing agents. Mostly unreactive in other settings. Not
affected by aqueous solutions of acids, alkalis, most oxidizing
agents, and most reducing agents.
Waste disposal
Dissolve or mix the material
with a combustible solvent and burn in a chemical incinerator
equipped with an afterburner and scrubber. All federal,
state, and local environmental regulations must be
observed. Asphalt solids may be landfilled.
Asphalt Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
