Product Name: Pentachloronaphthalene 
Synonyms of Pentachloronaphthalene (CAS NO.1321-64-8) : Naphthalene, pentachloro-
CAS NO: 1321-64-8
Molecular Formula:C₁₀ H₃ Cl₅                  
Molecular Weight :300.3958                   
Molecular Structure :
EINECS: 215-320-8
Index of Refraction:1.671
Surface Tension: 51.2 dyne/cm 
Density: 1.638 g/cm³ 
Flash Point: 194.1 °C
Melting Point: 120°C. 
Enthalpy of Vaporization: 60.77 kJ/mol 
Boiling Point: 383.9 °C at 760 mmHg 
Vapour Pressure: 9.42E-06 mmHg at 25°C 
Appearance: Pentachloronaphthalene (CAS NO.1321-64-8) is pale-yellow to white solid or powder .

 Pentachloronaphthalene (CAS NO.1321-64-8) is used in lubricants and in the manufacture of insulation for electrical wire.

Reported in EPA TSCA Inventory.

Poison by ingestion, inhalation, and skin contact. An irritant. Action similar to that of chlorinated naphthalenes and chlorinated diphenyls. Dangerous; when heated to decomposition it emits highly toxic fumes of Cl⁻. See also CHLORINATED HYDROCARBONS, AROMATIC.

Hazard Codes Xn,N
Risk Statements 21/22-36/38-50/53 
R21/22:Harmful in contact with skin and if swallowed. 
R36/38:Irritating to eyes and skin. 
R50/53:Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment.
Safety Statements 35-60-61
S35:This material and its container must be disposed of in a safe way. 
S60:This material and its container must be disposed of as hazardous waste. 
S61:Avoid release to the environment. Refer to special instructions / safety data sheets.

OSHA PEL: TWA 0.5 mg/m³ (skin)
ACGIH TLV: TWA 0.5 mg/m³
DFG MAK: 0.5 mg/m³
NIOSH REL: (Pentachloronaphthalen) TWA 0.5 mg/m³ (skin)

1.General Description:  Presents an environmental danger. If released into the environment, bioaccumulation takes place, specifically in fish. Will persist in the environment causing long-term adverse effects. The halowaxes are technical-grade chlorinated naphthalenes containing HALOWAX 1013 in its various isomers together with (mainly) trichloro- tetrachloro- and hexa-chloronapthalenes in their various isomers.
2.Reactivity Profile :HALOWAX 1013 is non-flammable, but combustible. Gives off irritating or toxic gases in a fire. Incompatible with strong oxidizing agents. Reacts violently with aluminum, with bases, and with liquid O2.