1. Naphthalene

2. Safety Moment Naphthalene
Flammable solid
Acute oral toxicity
Respiratory hazard
Aquatic toxicity
Flash Point
79 °C
(174.2 °F)
Suspected of causing cancer.
Very toxic to aquatic life
LD50 Oral
(rat)
490.0 mg/kg
LC50 Inhalation (rat)
> 340 mg/L
1 h
LC50
(trout)
mg/L h
Mothballs and other products containing naphthalene are solids that turn into toxic gas. The toxic gas kills insects and may repel animals.
flash point of a volatile material is the lowest temperature at which it can vaporize to form an ignitable mixture in air. 
BP: 424°F / 218 C
MLT: 176°F / 77 C

3. Safety Moment Naphthalene
Exposure Routes:  inhalation, skin absorption, ingestion, eye contact
Symptoms: irritation, headache, confusion, nausea, vomiting, abdominal pain, irritated bladder…
Best practices:
Ensure adequate ventilation and avoid breathing vapors
Handle with gloves to prevent contact with skin.
Wash skin thoroughly after handling.
Store away from heat/sparks in dry and well-ventilated place
Avoid release to the environment
Do not put down the drain
Naphthalene SDS, Sigma Aldrich.
Naphthalene, NIOSH Pocket Guide to Hazardous Chemicals, Center for Disease Control.