NIOSH Pocket Guide to Chemical Hazards

Pentachloronaphthalene CAS 1321-64-8
C10H3Cl5 RTECS QK0300000
Synonyms & Trade Names
Halowax® 1013; 1,2,3,4,5-Pentachloronaphthalene
DOT ID & Guide
NIOSH REL: TWA 0.5 mg/m3 [skin]
OSHA PEL: TWA 0.5 mg/m3 [skin]
IDLH Unknown Conversion
Physical Description
Pale-yellow or white solid or powder with an aromatic odor.
MW: 300.4
BP: 636°F
MLT: 248°F
Sol: Insoluble
VP: <1 mmHg
IP: ?

Sp.Gr: 1.67
Fl.P: NA

Noncombustible Solid
Incompatibilities & Reactivities
Strong oxidizers
Measurement Methods
NIOSH S96 (II-2)
Personal Protection & Sanitation
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: Daily

First Aid (See procedures)
Eye: Irrigate immediately
Skin: Soap promptly/molten flush immediately
Breathing: Respiratory support
Swallow: Medical Attention immediately
Respirator Recommendations NIOSH/OSHA
Up to 5 mg/m3: (APF = 10) Any supplied-air respirator*/(APF = 50) Any self-contained breathing apparatus with a full facepiece
Emergency or planned entry into unknown concentrations or IDLH conditions: (APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode/(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus
Escape: (APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister having a high-efficiency particulate filter/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Headache, lassitude (weakness, exhaustion), dizziness, anorexia; pruritus, acne-form skin eruptions; jaundice, liver necrosis
Target Organs Skin, liver, central nervous system