Phosphorus sesquisulfide

  • Tetraphosphorus trisulfide
Formula
P4S3
Structure
Description
A yellow crystalline solid.
Uses
Used in making matches & friction strips for safety-match boxes.

Registry Numbers and Inventories.
CAS
1314-85-8
EC (EINECS/ELINCS)
215-245-0
EC Index Number
015-012-00-1
EC Class
Highly flammable; Harmful; Dangerous for the Environment
RTECS
TH4330000
RTECS class
Other
UN (DOT)
1341
Merck
12,9375
Beilstein/Gmelin
2625 (G)
Swiss Giftliste 1
G-2746
Canada DSL/NDSL
DSL
Austrailia AICS
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
P4S3
Formula mass
220.09
Melting point, °C
172.5
Boiling point, °C
407
Density
2.03 g/cm3 (20 C)
Solubility in water
Insoluble

Hazards and Protection.
Storage
Protect against physical damage. Store in cool, ventilated place. Separate from other materials.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
In fire condition wear self-contained breathing apparatus.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Do not use water. Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Keep material dry.
Stability
Stable in air.
Incompatibilities
Incompatibilities:
Decomposition
Dangerous when heated to decomposition, emits highly toxic fumes of phosphorus oxides and sulfur oxides.

Fire.
Flash Point,°C
100
Fire fighting
Do not use water. Use dry chemical or carbon dioxide. When fire is out, cover all suspected material with dry sand or earth to prevent re-ignition until material can be permanently disposed of.
Fire potential
Highly flammable.
Hazards
Produce flammable and toxic gases on contact with water. May ignite on contact with water or moist air. Some react vigorously or explosively on contact with water. May be ignited by heat, sparks or flames. May re-ignite after fire is extinguished. Some are transported in highly flammable liquids. Runoff may create fire or explosion hazard.
Combustion products
Burning produces toxic sulfur dioxide.

Health.
Poison_Class
3
Exposure effects
Fever in the absence of infectious complications may be seen (rubitsky & myerson, 1949; blumenthal & lesser, 1938). Abnormally low blood pressure and rapid heart rate may develop in severe cases. Hepatic encephalopathy, usually occurring in the third stage of poisoning, may include symptoms of headache, seizures, confusion, delirium and coma. Headache, malaise, restlessness, irritability, drowsiness, lethargy, weakness, delirium, psychosis, stupor, seizures, and coma have been reported. Phosphorus has been shown to cross the placental barrier, but cases of human fetal poisoning have not been reported.
   Ingestion
Nausea, vomiting, abdominal pain, diarrhea, hematemesis, and smoking and luminescence of vomitus and feces may occur.
   Inhalation
Oral exposure may cause tachypnea, shallow respirations, hyperventilation. Laryngospasm causing dyspnea and/or apnea may also result.
   Skin
See Inhalation.
   Eyes
May cause burns.

First aid
 
   Ingestion
The possible benefit of early removal of some ingested material by cautious gastric lavage must be weighed against potential complications of bleeding or perforation. Activated charcoal activated charcoal binds most toxic agents and can decrease their systemic absorption if administered soon after ingestion. Activated charcoal: administer charcoal as a slurry (240 ml water/30 g charcoal). Usual dose: 25 to 100 g in adults/adolescents.
   Inhalation
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult.
   Skin
Prompt removal of all clothing, including jewelry, and copious irrigation with water should occur as soon as possible. Immerse exposed areas in water or cover with wet dressings at all times.
   Eyes
Continuously irrigate with copious amounts of tepid water for at least 15 minutes. Keep exposed eyes covered with wet compresses. The patient should be referred for evaluation at a health care facility and formal ophthalmologic examination.

Transport.
UN number
1341
Response guide
Hazard class
4.1
Packing Group
II
 
Std. Transport #
4917506