Substance profile
Symclosene
Symclosene is needles from ethylene chloride with a chlorine odor.
01 · Identification
What Symclosene is
Symclosene is needles from ethylene chloride with a chlorine odor. Its molecular formula is C3Cl3N3O3 and its molecular weight is 232.41 g/mol. It melts at 235 °C, is soluble in water.
Under the GHS it carries the signal word Danger. It is classed as reactive agents - 2nd degree.
Other names for Symclosene
- trichloroisocyanuric acid
- trichloro-1,3,5-triazinetrion
02 · GHS classification
Hazards and label elements
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
| Code | Hazard statement |
|---|---|
| H272 | May intensify fire; oxidiser. |
| H302 | Harmful if swallowed. |
| H335 | May cause respiratory irritation. |
| H319 | Causes serious eye irritation. |
| H400 | Very toxic to aquatic life. |
| H410 | Very toxic to aquatic life with long lasting effects. |
Supplemental EU statements: EUH031
Precautionary statements: P264, P270, P273, P280, P301, P305, P312, P313, P330, P337, P338, P391, P501
03 · Physical and chemical properties
Symclosene properties
Every value is shown with the conditions it was measured under and the source it came from. Where sources disagree, all values are listed rather than one being picked — the difference is usually a different form of the substance, not an error.
| Property | Value | Conditions | Source |
|---|---|---|---|
| Melting point | 235 °C (455 °F) | DOE PAC | |
| 246.7 °C (476.1 °F) | decomposes, decomposes | HSDB | |
| Density | 2.07 g/cm³ | ICSC | |
| 1 g/cm³ | DOE PAC | ||
| 1 g/cm³ | at 20 °C, est | CAMEO | |
| Solubility | Soluble in chlorinated and highly polar solvents | HSDB | |
| Solubility in water at 25 °C = 1 g/100 g; Solubility in acetone at 30 °C = 35.0 g/100 g | at 25 °C | HSDB | |
| Water solubility = 1.2% = 1.20X10+4 mg/L at 25 °C | at 25 °C | HSDB | |
| Vapor pressure | 1.2e-7 mmHg | Haz-Map | |
| negligible | ICSC | ||
| Flash point | 250 °C (482 °F) | above this value | HSDB |
| Lower explosive limit (LEL) | Closed containers may rupture violently when heated. | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Fire and explosion
Fire and explosion behaviour of Symclosene
These are descriptions rather than measured values, so they are kept out of the table above and quoted here with the source that reported them.
Fire and explosion
Calcium hypochlorite and trichloro-s-triazinetrione were tested in a bomb apparatus measuring temperature and gas production. Combining the two chlorinators at 2, 6, 12, or 18 g of each produced a progressive increase in gas production from 234 to 1422 mL. The temperature increased from 30 degrees C at 2 g to 63 degrees C at 18 g. The time to complete the reaction decreased from 6.2 minutes at 2 g to 3.8 minutes at 18 g. The third run at the 18 g level resulted in an explosion. The results indicate that gas generation is dependent on both products.
Source: HSDB
05 · Handling and storage
Storing and handling Symclosene
Storage conditions
Store in a cool, dry, well-ventilated location. Outside or detached storage is preferred. Must be stored in a dry location on pallets arranged according to NFPA 430, Code for Storage of Liquids and Solid Oxidizers. Separate from combustibles, oxidizables, ammonia, sodium carbonate (soda ash), calcium hypochlorite, hydrogen peroxide.
Source: Hazardous Substances Data Bank (HSDB)
Incompatible materials
A powerful oxidizer. Violent reaction with reducing agents, combustible materials.
Source: Hazardous Substances Data Bank (HSDB)
Reactivity
TRICHLORO-S-TRIAZINETRIONE, DRY is an oxidizer. It reacts with combustible materials or ammonium salts, resulting in fire. It is thermally unstable, and reacts with small amounts of water to release toxic chlorine gas and explosive nitrogen trichloride. Reaction of this compound with ammonia or amines also produces nitrogen trichloride. This compound reacts explosively with calcium hypochlorite and water. [NFPA 49, 14th ed. 2010]
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Symclosene in the storage compatibility matrix →