NIOSH Pocket Guide to Chemical Hazards


CAS 1321-64-8


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 See: 1321648 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)
See: NMAM or OSHA Methods
Personal Protection & Sanitation (See protection)
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
Important additional information about respirator selection
Respirator Recommendations (See Appendix F) 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
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister having an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters./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
See also: INTRODUCTION   See ICSC CARD: 0935   See MEDICAL TESTS: 0177