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Metals, alloys and elements

Tetraphosphorus

Also known as Phosphorus tetramer, Tetrameric phosphorus, Phosphorus (yellow)

CAS 100320-09-0Formula P4Molar mass 123.90 g/mol
GHS signal word: Danger. Pictograms: Flammable, Corrosive, Acute toxicity (severe), Hazardous to the environment 4 suppliers listed
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Tetraphosphorus chemical structure, P4, CAS 100320-09-0
2D chemical structure

Key facts

What buyers check first

All properties
Physical form
Crystals
Melting point
44 °C
Boiling point
280 °C
Density
1.83 g/cm³
Solubility
Solubility in water, g/100ml at 20 °C: 0.0003
HS code
280470
Category
Metals, alloys and elements
UN number
UN 1381
Illustrative photo, a shrink wrapped pallet of kraft paper sacks in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is Tetraphosphorus?

Plain description, key identifiers and synonyms

Tetraphosphorus is a member of tetraatomic phosphorus.

Tetraphosphorus is a molecular allotrope of phosphorus.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
1,2,3,4-tetraphosphatricyclo[1.1.0.02,4]butane
CAS number
100320-09-0Other or deprecated CAS: 12185-10-3, 62611-24-9
Molecular formula
P4
InChIKey
OBSZRRSYVTXPNB-UHFFFAOYSA-N
InChI
InChI=1S/P4/c1-2-3(1)4(1)2
SMILES (canonical and isomeric)
P12P3P1P23

Synonyms

  • Phosphorus tetramer
  • Tetrameric phosphorus
  • Phosphorus (yellow)
  • Phosphorus tetraatomic molecule
  • Phosphorus, mol. (P4)
  • Phosphorus molecule (P4)
  • tricyclo(1.1.0.02,4)tetraphosphane
  • Phosphorus, White
  • Molecular phosphorus
  • Tetraatomic phosphorus
  • Yellow phosphorus
  • Phosphorus, yellow
  • P (white)
  • Phosphorus white, moten
  • Phosphorus, mol.(P4)
  • White Phosphorus (P4)
  • tetrahedro-tetraphosphorus
  • Phosphorus (white or yellow)
  • Phosphorus, white or yellow, moten
  • [Td-(13)-Delta(4)-closo]tetraphosphorus
  • Phosphorus white, moten [UN2447] [Spontaneously combustible]

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Physical form
Crystalsexp.
Melting point
44 °Cexp.
Boiling point
280 °Cexp.
Density
1.83 g/cm³exp.
Autoignition temperature
30 °Cexp.
Solubility
Solubility in water, g/100ml at 20 °C: 0.0003exp.
Vapour pressure
Vapor pressure, Pa at 20 °C: 3.5exp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
123.90 g/molcalc.
Exact mass
123.895 Dacalc.
LogP (octanol/water)
3.44calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
4calc.
Rings
4calc.
Aromatic rings
4calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, p12p3p1p23

p12p3p1p23

4 rings, 4 atoms. This chemical is the scaffold itself.

No other chemical in our database has this scaffold.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS02: Flammable
Flammable
GHS05: Corrosive
Corrosive
GHS06: Acute toxicity (severe)
Acute toxicity (severe)
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H250Catches fire spontaneously if exposed to air.
  • H300Fatal if swallowed.
  • H314Causes severe skin burns and eye damage.
  • H330Fatal if inhaled.
  • H400Very toxic to aquatic life.
Precautionary statements (27)
  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P222Do not allow contact with air.
  • P231Handle and store contents under inert gas.
  • P233Keep container tightly closed.
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P284In case of inadequate ventilation wear respiratory protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P301 + P330 + P331If swallowed: Rinse mouth. Do not induce vomiting.
  • P302 + P335 + P334If on skin: Brush off loose particles from skin. Immerse in cool water or wrap in wet bandages.
  • P302 + P361 + P354If on skin: Take off immediately all contaminated clothing. Immediately rinse with water for several minutes.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P316Get emergency medical help immediately.
  • P320Specific treatment is urgent (see supplemental first aid instructions on the label).
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P363Wash contaminated clothing before reuse.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • P391Collect spillage.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 1381
Transport hazard class
4.2
Packing group
I

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Tetraphosphorus suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 4 suppliers
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Where suppliers are based

4 suppliers in 4 countries

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Tetraphosphorus price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Pharmacology

White Phosphorus is the element phosphorus in its allotropic form, a soft, waxy, poisonous solid melting at 44.5 degrees C, soluble in carbon disulfide, insoluble in water and alcohol, self-igniting in air.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 015-001-00-1

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Tetraphosphorus is traded under.

HS 2804.70Indicative HS code

Phosphorus

World exports in 2024
$537M
−12.2% vs 2023, imports $534M
2019 to 2024
Top exporters
  1. Vietnam * partner reported44.1%
  2. Kazakhstan * partner reported32.5%
  3. United States13.8%
Top importers
  1. Japan17.1%
  2. Germany17.1%
  3. South Korea13.2%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Tetraphosphorus is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Tetraphosphorus, based on the data on this page

What is Tetraphosphorus?

Tetraphosphorus is a member of tetraatomic phosphorus.

What is the CAS number of Tetraphosphorus?

The CAS registry number of Tetraphosphorus is 100320-09-0. Other or deprecated CAS numbers: 12185-10-3, 62611-24-9.

What is the molecular formula and weight of Tetraphosphorus?

The molecular formula of Tetraphosphorus is P4 and its molar mass is 123.90 g/mol.

Is Tetraphosphorus hazardous?

Tetraphosphorus carries the GHS signal word "Danger". Main hazards: catches fire spontaneously if exposed to air, fatal if swallowed, causes severe skin burns and eye damage. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Tetraphosphorus?

Tetraphosphorus is usually classified under HS code 280470 (Phosphorus). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Tetraphosphorus?

CompoundList lists 4 suppliers of Tetraphosphorus in Canada, China, Spain and United States. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Tetraphosphorus?

Suppliers quote Tetraphosphorus on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Tetraphosphorus

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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