Substance profile
Dichloro-1,3,5-triazinetrione
Dichloro-1,3,5-triazinetrione is white, crystalline powder, granules with a chlorine odor.
01 · Identification
What Dichloro-1,3,5-triazinetrione is
Dichloro-1,3,5-triazinetrione is white, crystalline powder, granules with a chlorine odor. Its molecular formula is C3HCl2N3O3 and its molecular weight is 197.96 g/mol. It melts at 227 °C.
Under the GHS it carries the signal word Danger. It is classed as reactive agents - 2nd degree.
02 · Identifiers
Dichloro-1,3,5-triazinetrione identifiers and molecular data
Dichloro-1,3,5-triazinetrione CAS number and EC number
Dichloro-1,3,5-triazinetrione molecular formula and molecular weight
Other names for Dichloro-1,3,5-triazinetrione
- dichloroisocyanuric acid
03 · GHS classification
Dichloro-1,3,5-triazinetrione hazard classification
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
Dichloro-1,3,5-triazinetrione pictograms and signal word
Dichloro-1,3,5-triazinetrione hazard class and category
| Hazard class | Category | From code | Pictogram |
|---|---|---|---|
| Oxidising liquids or Oxidising solids | Category 2 or 3 | H272 | GHS03 |
| Acute toxicity - oral GHS chapter 3.1 | Category 4 | H302 | GHS07 |
| Serious eye damage/eye irritation GHS chapter 3.3 | Category 2A | H319 | GHS07 |
| Specific target organ toxicity - single exposure GHS chapter 3.8 | Category 3 | H335 | GHS07 |
| Hazardous to the aquatic environment - acute GHS chapter 4.1 | Category 1 | H400 | GHS09 |
| Hazardous to the aquatic environment - chronic GHS chapter 4.1 | Category 1 | H410 | GHS09 |
Where two values are shown with “or”, the hazard statement is shared by more than one category or by more than one class, and the code alone does not say which. H272, for example, belongs to oxidising liquids and to oxidising solids — the physical state decides. The binding answer for a specific entry is in the CLP Annex VI table itself.
Dichloro-1,3,5-triazinetrione hazard statements (H-codes)
| 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. |
Dichloro-1,3,5-triazinetrione supplemental EU statements (EUH)
| Code | Statement |
|---|---|
| EUH031 | Contact with acids liberates toxic gas. |
This page lists only the codes assigned to Dichloro-1,3,5-triazinetri…. The full reference lives on the hazard statements hub, the precautionary statements hub and the GHS pictograms hub.
Safety Data Sheet
Getting an SDS for Dichloro-1,3,5-triazinetri…
A Safety Data Sheet is written for a product, not for a substance: the supplier of the grade you actually buy issues it, so two suppliers of Dichloro-1,3,5-triazin… issue two different sheets. That is why there is no single authoritative SDS for a substance to download — what there is, is the job of collecting the sheets for the products you hold and keeping them current as suppliers revise them.
04 · Precautionary statements
Dichloro-1,3,5-triazinetrione precautionary statements
CLP Annex VI assigns 13 precautionary statements to Dichloro-1,3,5-triazinetri…. They are grouped the way a label groups them: what to do before handling, what to do when something has already happened, how to store it and how to dispose of it.
Prevention
What to do before and during handling so the hazard never happens.
Response
What to do once exposure, spillage or fire has already happened.
Disposal
What has to happen to the contents and the empty container.
Reading the notation. … is a blank the supplier fills in — not a truncated sentence.· [square brackets] mark a part printed only when it applies.
05 · Names in the regulation
Dichloro-1,3,5-triazinetrione name in 23 EU languages
CLP Annex VI Part 3 is published in every language edition of the regulation, and the identification column is written out in each of them. Nothing below is translated by us: each line is the name as that edition prints it. Under Art. 18(2) the substance name from Annex VI is a lawful product identifier, so this is the wording to put on a label going to that market — and where the cell lists several designations, any one of them qualifies.
| Language | Name in CLP Annex VI Part 3 |
|---|---|
| Bulgarian български | дихлоро-1,3,5-триазинтрион дихлороизоцианурова киселина |
| Spanish español | Dicloro-1,3,5-triazinatriona Ácido dicloroisocianúrico |
| Czech čeština | 1,3-dichlor-1,3,5-triazin-2,4,6(1 H ,3 H ,5 H )-trion dichlorisokyanurová kyselina |
| Danish dansk | dichlor-1,3,5-triazintrion dichlorisocyanursyre |
| German Deutsch | Dichlor-1,3,5-triazintrion DichlorisocyanursäureTroclosen |
| Estonian eesti | dikloro-1,3,5-triasiintrioon dikloroisotsüanuurhape |
| Greek ελληνικά | διχλωρο-1,3,5-τριαζινετριόνη διχλωροϊσοκυανουρικό οξύ |
| English English | dichloro-1,3,5-triazinetrione dichloroisocyanuric acid |
| French français | dichloro-1,3,5-triazinetrione acide dichloroisocyanurique |
| Croatian hrvatski | diklor-1,3,5-triazintrion diklorizocijanurska kiselina |
| Italian italiano | dicloro-1,3,5-triazintrione acido dicloroisocianurico |
| Latvian latviešu | dihlor-1,3,5-triazīntrions dihlorizocianūrskābe |
| Lithuanian lietuvių | dichlor-1,3,5-triazintrionas dichlorizocianuro rūgštis |
| Hungarian magyar | diklór-1,3,5-triazintrion diklórizocianursav |
| Maltese Malti | dikloro-1,3,5-triażinatrion aċidu dikloroisoċjanuriku |
| Dutch Nederlands | dichloor-1,3,5-triazinetrion dichloorisocyanuurzuur |
| Polish polski | 1,3-dichloro-1,3,5-triazinano-2,4,6-trion kwas dichloroizocyjanurowy |
| Portuguese português | dicloro-1,3,5-triazinatriona ácido dicloroisocianúrico |
| Romanian română | dicloro-1,3,5-triazintrionă acid dicloroizocianuric |
| Slovak slovenčina | 4,6-dichlór-1,3,5-triazín-2-ol kyselina dichlórizokyanurová |
| Slovenian slovenščina | dikloro-1,3,5-triazintrion dikloroizocianurska kislina |
| Finnish suomi | dikloori-1,3,5-triatsiinitrioni dikloori-isosyanuurihappo |
| Swedish svenska | diklor-1,3,5-triazintrion diklorisocyanursyra |
All 23 language editions of Annex VI carry this entry. Irish is the twenty-fourth official EU language and has no line here for a different reason: no consolidated CLP text has ever been published in Irish, so there is no Irish edition of Annex VI to quote a name from. Source: consolidated CLP, CELEX 02008R1272, language editions. © European Union, https://eur-lex.europa.eu — only the electronic Official Journal of the European Union is authentic.
06 · Label elements
Dichloro-1,3,5-triazinetrione GHS label elements
Everything CLP Annex VI fixes for Dichloro-1,3,5-triazinetri…, laid out the way it appears on a label. The greyed lines are the parts only the supplier can fill in.
Danger
Dichloro-1,3,5-triazinetrione
- May intensify fire; oxidiser.
- Harmful if swallowed.
- May cause respiratory irritation.
- Causes serious eye irritation.
- Very toxic to aquatic life.
- Very toxic to aquatic life with long lasting effects.
- Contact with acids liberates toxic gas.
- Wash … thoroughly after handling.
- Do not eat, drink or smoke when using this product.
- Avoid release to the environment.
- Wear protective gloves/protective clothing/eye protection/face protection/hearing protection/…
- IF SWALLOWED:
- IF IN EYES:
- Call a POISON CENTER/doctor/… if you feel unwell.
- Get medical advice/attention.
- Rinse mouth.
- If eye irritation persists:
- Remove contact lenses, if present and easy to do. Continue rinsing.
- Collect spillage.
- Dispose of contents/container to …
Supplier name, address and telephone number· Product identifier·Nominal quantity
Need this as an actual label? Open Dichloro-1,3,5-triazinetri… in the GHS label constructor →
07 · Health hazards
Dichloro-1,3,5-triazinetrione health hazards and exposure limits
Dichloro-1,3,5-triazinetrione hazard summary
An oxidzer that can ignite organic materials; An eye irritant; [Hawley] A strong skin, eye, and respiratory tract irritant; [HSDB] May react with water evolving chlorine gas; [CAMEO] An eye and respiratory tract irritant; [eChemPortal: ESIS] When dissolved in water, all chlorinated isocyanurates form hypochlorous acid, a weak acid and oxidizing agent; An eye irritant; [EPA REDs] See Sodium dichloroisocyanurate.
Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
08 · Physical and chemical properties
Dichloro-1,3,5-triazinetrione 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.
Dichloro-1,3,5-triazinetrione melting point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Melting point | 226.6 °C (439.9 °F) | HSDB | |
| 225 °C (437 °F) | CAMEO |
Dichloro-1,3,5-triazinetrione density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Density | 0.849 g/cm³ | HSDB |
Dichloro-1,3,5-triazinetrione solubility
| Property | Value | Conditions | Source |
|---|---|---|---|
| Solubility | Readily soluble in polar organic solvents (ketones, nitriles, esters) | HSDB | |
| Moderately soluble in water | HSDB | ||
| Aqueous solubility = 0.7% at 20 °C | at 20 °C | HSDB |
Dichloro-1,3,5-triazinetrione lower explosive limit (LEL)
| Property | Value | Conditions | Source |
|---|---|---|---|
| Lower explosive limit (LEL) | Contact with ammonia, ammonium salts, urea or similar compounds which contain nitrogen may form nitrogen trichloride, a highly explosive compound. | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
09 · Fire and explosion
Dichloro-1,3,5-triazinetri… fire and explosion behaviour
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.
Dichloro-1,3,5-triazinetrione fire potential
Not combustible but contact with most foreign material, organic matter, or easily chlorinated or oxidized materials may result in fire since dichloroisocyanuric acid is a highly reactive oxidizing and chlorinating agent.
Source: Hazardous Substances Data Bank (HSDB)
10 · Handling and storage
Dichloro-1,3,5-triazinetrione storage and handling
Dichloro-1,3,5-triazinetrione storage conditions
Protect against phys damage. Store in cool, dry, well-ventilated place away from flammable liq, combustible materials, and oxidizable materials. Drums may rupture if contents are exposed to heat or become contaminated or wet. Drums should be palletized to prevent wetting from floor washings or drainage. Avoid prolonged storage in unventilated areas at summer temperatures.
Source: Hazardous Substances Data Bank (HSDB)
Dichloro-1,3,5-triazinetrione incompatible materials
Not combustible, but contact with most foreign materials, organic matter or easily chlorinated or oxidized materials may result in fire since this substance is a highly reactive oxidizing and chlorinating agent. Contact with ammonia, ammonium salts, urea or similar compounds which contain nitrogen may form nitrogen trichloride, a highly explosive compound.
Source: Hazardous Substances Data Bank (HSDB)
Dichloro-1,3,5-triazinetrione reactivity
DICHLOROISOCYANURIC ACID is slightly hygroscopic and is unstable in the presence of DMSO. This is an oxidizing material; it may ignite organic compounds with which it comes in contact. (NTP, 1992)
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Dichloro-1,3,5-triazinetr… in the storage compatibility matrix →
11 · Transport
Dichloro-1,3,5-triazinetrione UN number and transport classification
Transport classification is a separate system from the GHS classification above. It decides how a package is marked and how a load may be carried; it does not follow from the workplace label, and the workplace label does not follow from it. The entries below are linked by CAS number, never by name.
Dichloro-1,3,5-triazinetrione under UN 2465 — shipping name, class and packing group
Europe · ADR 2025, Table A
| Proper shipping name (3.1.2) | Class | Classification code | PG | Labels (column 5) |
|---|---|---|---|---|
| DICHLOROISOCYANURIC ACID, DRY or DICHLOROISOCYANURIC ACID SALTS | 5.1 | O2 | II | |
Source: ADR 2025, Table A of Chapter 3.2 · ECE/TRANS/352 Vol. I (UNECE). Class 5.1 is “Oxidizing substances” (ADR 2.1.1.1).
United States · 49 CFR 172.101 Hazardous Materials Table
| Proper shipping name (column 2) | Class or division | PG | Labels (column 6) |
|---|---|---|---|
| Dichloroisocyanuric acid, dry or Dichloroisocyanuric acid salts | 5.1 | II | |
Source: 49 CFR 172.101 Hazardous Materials Table · eCFR, revision 2026-08-03. Class 5.1 is “Oxidizer” (49 CFR 173.2).
12 · Questions
Dichloro-1,3,5-triazinetrione — frequently asked questions
What is the CAS number of Dichloro-1,3,5-triazinetrione?
The CAS number of Dichloro-1,3,5-triazinetrione is 2782-57-2. Its EC number is 220-487-5.
What is the chemical formula of Dichloro-1,3,5-triazinetrione?
The molecular formula of Dichloro-1,3,5-triazinetrione is C3HCl2N3O3 and its molecular weight is 197.96 g/mol.
What does a Dichloro-1,3,5-triazinetrione label have to show?
Under CLP Annex VI the label for Dichloro-1,3,5-triazinetrione carries the pictograms Flame over circle, Exclamation mark and Environment and the signal word is Danger.
Is Dichloro-1,3,5-triazinetrione flammable?
CLP Annex VI assigns Dichloro-1,3,5-triazinetrione no flammability hazard class. That is not a statement that it cannot burn: the harmonised list only records the hazards that were assessed for it.
Is Dichloro-1,3,5-triazinetrione a carcinogen?
CLP Annex VI records no harmonised carcinogenicity classification for Dichloro-1,3,5-triazinetrione. Annex VI is a list of agreed classifications, not a list of substances found safe, so this is an absence of a classification rather than a clean bill of health.
What is the melting point of Dichloro-1,3,5-triazinetrione?
The melting point reported for Dichloro-1,3,5-triazinetrione is 226.6 °C (439.9 °F) (HSDB).
How should Dichloro-1,3,5-triazinetrione be stored?
Protect against phys damage. Store in cool, dry, well-ventilated place away from flammable liq, combustible materials, and oxidizable materials. Drums may rupture if contents are exposed to heat or become contaminated or wet. Drums should be palletized to prevent wetting from floor washings or drainage. Avoid prolonged storage in unventilated areas at summer temperatures. (Hazardous Substances Data Bank (HSDB))
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