Chemical identity and waste assessment

Chemical waste disposal library

A source-linked index of chemical identities, with guidance on the information needed to classify and route chemical waste.

Technical informationSources and further reading

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4,476 reference records · 8 detailed guides

This index brings together chemical identities from the ILO / WHO International Chemical Safety Cards and the HSE GB mandatory classification and labelling list. Use the names, identifiers and available formulae to compare a product label, safety data sheet or waste inventory with the source record. Separate source entries may describe different forms or concentrations of the same substance. A match confirms only the source identity; it does not establish the composition of the waste, collection availability or a suitable treatment route. HSE identity information contains Crown copyright material reproduced under the Open Government Licence v3.0.

The detailed guides explain properties and waste-assessment points for particular chemicals. A chemical name or CAS number does not, on its own, establish a List of Waste code, packaging requirement, transport classification or receiving-facility acceptance.

Using chemical identity in a waste assessment

Identity is one part of the waste description. Concentration, process history, contamination and container condition can change the assessment even when the original product is known.

  • Identity: product name, CAS or EC number and the supplier safety data sheet.
  • Waste status: unused stock, spent process material, mixture or contaminated packaging.
  • Quantity and condition: amount, concentration, container sizes and container condition.
  • Process history: how the waste arose, including known additions, contaminants or any available analysis.
Source references and waste guidance

These sources cover chemical identity, safety data sheets and waste classification. Each has its own scope; none of them confirms that a particular waste load will be accepted by a receiving facility.

Chemical waste guides

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1,699 matching records · Clear search

Chemical reference

OLEUM

ICSC 1447 · CAS 8014-95-7

Formula: H2SO4.O3S

Sulfuric acid, fuming; Disulphuric acid; Dithionic acid; Pyrosulfuric acid; Mixture of sulfuric acid and sulfur trioxide

ILO / WHO chemical safety card

Identity reference only. The source helps identify the substance; it does not establish the composition or classification of a waste stream, or whether it will be accepted for treatment.

Reference notes and technical facts
  • Check the product label and supplier safety data sheet for the substance identity, concentration and formulation.
  • Waste assessment also depends on quantity, container condition, process history, mixing and contamination.

ILO / WHO chemical safety card

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Chemical reference

ORTHO-PHTHALALDEHYDE

ICSC 1784 · CAS 643-79-8

Formula: C6H4(CHO)2/C8H6O2

1,2-Benzenedicarboxaldehyde; Phthaldialdehyde; OPA; Benzene-1,2-dicarbaldehyde

ILO / WHO chemical safety card

Identity reference only. The source helps identify the substance; it does not establish the composition or classification of a waste stream, or whether it will be accepted for treatment.

Reference notes and technical facts
  • Check the product label and supplier safety data sheet for the substance identity, concentration and formulation.
  • Waste assessment also depends on quantity, container condition, process history, mixing and contamination.

ILO / WHO chemical safety card

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Chemical reference

ortho-TOLUIDINE

ICSC 0341 · CAS 95-53-4

Formula: C7H9N/C6H4CH3NH2

1-Amino-2-methylbenzene; 2-Aminotoluene; o-Methylaniline

ILO / WHO chemical safety card

Identity reference only. The source helps identify the substance; it does not establish the composition or classification of a waste stream, or whether it will be accepted for treatment.

Reference notes and technical facts
  • Check the product label and supplier safety data sheet for the substance identity, concentration and formulation.
  • Waste assessment also depends on quantity, container condition, process history, mixing and contamination.

ILO / WHO chemical safety card

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Chemical reference

OSMIUM TETROXIDE

ICSC 0528 · CAS 20816-12-0

Formula: O4Os

Osmic acid anhydride; Osmium oxide; Osmium tetraoxide

ILO / WHO chemical safety card

Identity reference only. The source helps identify the substance; it does not establish the composition or classification of a waste stream, or whether it will be accepted for treatment.

Reference notes and technical facts
  • Check the product label and supplier safety data sheet for the substance identity, concentration and formulation.
  • Waste assessment also depends on quantity, container condition, process history, mixing and contamination.

ILO / WHO chemical safety card

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Chemical reference

OXALIC ACID

ICSC 0529 · CAS 144-62-7

Formula: C2H2O4/(COOH)2

Ethanedioic acid

ILO / WHO chemical safety card

Identity reference only. The source helps identify the substance; it does not establish the composition or classification of a waste stream, or whether it will be accepted for treatment.

Reference notes and technical facts
  • Check the product label and supplier safety data sheet for the substance identity, concentration and formulation.
  • Waste assessment also depends on quantity, container condition, process history, mixing and contamination.

ILO / WHO chemical safety card

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Chemical reference

OXALIC ACID DIHYDRATE

ICSC 0707 · CAS 6153-56-6

Formula: C2H2O4.2H2O/(COOH)2.2H2O

Ethanedioic acid dihydrate

ILO / WHO chemical safety card

Identity reference only. The source helps identify the substance; it does not establish the composition or classification of a waste stream, or whether it will be accepted for treatment.

Reference notes and technical facts
  • Check the product label and supplier safety data sheet for the substance identity, concentration and formulation.
  • Waste assessment also depends on quantity, container condition, process history, mixing and contamination.

ILO / WHO chemical safety card

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Chemical reference

OXYGEN

ICSC 0138 · CAS 7782-44-7

Formula: O2

Reference entry from an ILO / WHO International Chemical Safety Card. The card defines the chemical identity and the scope of its safety information. Check the supplier safety data sheet for the actual product or formulation.

ILO / WHO chemical safety card

Identity reference only. The source helps identify the substance; it does not establish the composition or classification of a waste stream, or whether it will be accepted for treatment.

Reference notes and technical facts
  • Check the product label and supplier safety data sheet for the substance identity, concentration and formulation.
  • Waste assessment also depends on quantity, container condition, process history, mixing and contamination.

ILO / WHO chemical safety card

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Chemical reference

OXYGEN (LIQUEFIED)

ICSC 0880 · CAS 7782-44-7

Formula: O2

Oxygen, refrigerated liquid; LOX; Liquid oxygen

ILO / WHO chemical safety card

Identity reference only. The source helps identify the substance; it does not establish the composition or classification of a waste stream, or whether it will be accepted for treatment.

Reference notes and technical facts
  • Check the product label and supplier safety data sheet for the substance identity, concentration and formulation.
  • Waste assessment also depends on quantity, container condition, process history, mixing and contamination.

ILO / WHO chemical safety card

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Chemical reference

OXYGEN DIFLUORIDE

ICSC 0818 · CAS 7783-41-7

Formula: OF2

Oxygen fluoride; Fluorine monoxide; Difluorine monoxide

ILO / WHO chemical safety card

Identity reference only. The source helps identify the substance; it does not establish the composition or classification of a waste stream, or whether it will be accepted for treatment.

Reference notes and technical facts
  • Check the product label and supplier safety data sheet for the substance identity, concentration and formulation.
  • Waste assessment also depends on quantity, container condition, process history, mixing and contamination.

ILO / WHO chemical safety card

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Chemical reference

OZONE

ICSC 0068 · CAS 10028-15-6

Formula: O3

Reference entry from an ILO / WHO International Chemical Safety Card. The card defines the chemical identity and the scope of its safety information. Check the supplier safety data sheet for the actual product or formulation.

ILO / WHO chemical safety card

Identity reference only. The source helps identify the substance; it does not establish the composition or classification of a waste stream, or whether it will be accepted for treatment.

Reference notes and technical facts
  • Check the product label and supplier safety data sheet for the substance identity, concentration and formulation.
  • Waste assessment also depends on quantity, container condition, process history, mixing and contamination.

ILO / WHO chemical safety card

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Chemical reference

p-(METHYLAMINO)PHENOL

ICSC 1146 · CAS 150-75-4

Formula: C7H9NO

4-(Methylamino)phenol

ILO / WHO chemical safety card

Identity reference only. The source helps identify the substance; it does not establish the composition or classification of a waste stream, or whether it will be accepted for treatment.

Reference notes and technical facts
  • Check the product label and supplier safety data sheet for the substance identity, concentration and formulation.
  • Waste assessment also depends on quantity, container condition, process history, mixing and contamination.

ILO / WHO chemical safety card

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Chemical reference

p-(METHYLAMINO)PHENOL SULFATE

ICSC 1528 · CAS 55-55-0

Formula: (C7H9NO)2.H2SO4

bis(4-Hydroxy-N-methylanilinium) sulfate; Metol; 4-(Methylamino)phenol sulfate

ILO / WHO chemical safety card

Identity reference only. The source helps identify the substance; it does not establish the composition or classification of a waste stream, or whether it will be accepted for treatment.

Reference notes and technical facts
  • Check the product label and supplier safety data sheet for the substance identity, concentration and formulation.
  • Waste assessment also depends on quantity, container condition, process history, mixing and contamination.

ILO / WHO chemical safety card

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Chemical reference

p-ANISIDINE

ICSC 0971 · CAS 104-94-9

Formula: C7H9NO/H2NC6H4OCH3

4-Aminoanisole; 4-Methoxybenzenamine; 1-Amino-4-methoxybenzene; 4-Methoxyaniline

ILO / WHO chemical safety card

Identity reference only. The source helps identify the substance; it does not establish the composition or classification of a waste stream, or whether it will be accepted for treatment.

Reference notes and technical facts
  • Check the product label and supplier safety data sheet for the substance identity, concentration and formulation.
  • Waste assessment also depends on quantity, container condition, process history, mixing and contamination.

ILO / WHO chemical safety card

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Chemical reference

p-BENZOQUINONE

ICSC 0779 · CAS 106-51-4

Formula: C6H4O2

2,5-Cyclohexadiene-1,4-dione; Quinone; 1,4-Benzoquinone; p-Quinone

ILO / WHO chemical safety card

Identity reference only. The source helps identify the substance; it does not establish the composition or classification of a waste stream, or whether it will be accepted for treatment.

Reference notes and technical facts
  • Check the product label and supplier safety data sheet for the substance identity, concentration and formulation.
  • Waste assessment also depends on quantity, container condition, process history, mixing and contamination.

ILO / WHO chemical safety card

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Chemical reference

p-CHLORO-o-CRESOL

ICSC 1476 · CAS 1570-64-5

Formula: C7H7ClO

para-Chloro-ortho-cresol; Phenol, 4-chloro-2-methyl; 4-Chloro-o-cresol

ILO / WHO chemical safety card

Identity reference only. The source helps identify the substance; it does not establish the composition or classification of a waste stream, or whether it will be accepted for treatment.

Reference notes and technical facts
  • Check the product label and supplier safety data sheet for the substance identity, concentration and formulation.
  • Waste assessment also depends on quantity, container condition, process history, mixing and contamination.

ILO / WHO chemical safety card

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Chemical reference

p-CHLOROBENZOIC ACID

ICSC 0503 · CAS 74-11-3

Formula: ClC6H4COOH/C7H5ClO2

4-Chlorobenzoic acid; Chlorodracylic acid

ILO / WHO chemical safety card

Identity reference only. The source helps identify the substance; it does not establish the composition or classification of a waste stream, or whether it will be accepted for treatment.

Reference notes and technical facts
  • Check the product label and supplier safety data sheet for the substance identity, concentration and formulation.
  • Waste assessment also depends on quantity, container condition, process history, mixing and contamination.

ILO / WHO chemical safety card

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Chemical reference

p-CHLOROPHENOL

ICSC 0850 · CAS 106-48-9

Formula: C6H5ClO/C6H4ClOH

4-Chlorophenol; 4-Chloro-1-hydroxybenzene; 4-Hydroxychlorobenzene

ILO / WHO chemical safety card

Identity reference only. The source helps identify the substance; it does not establish the composition or classification of a waste stream, or whether it will be accepted for treatment.

Reference notes and technical facts
  • Check the product label and supplier safety data sheet for the substance identity, concentration and formulation.
  • Waste assessment also depends on quantity, container condition, process history, mixing and contamination.

ILO / WHO chemical safety card

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Chemical reference

p-CRESOL

ICSC 0031 · CAS 106-44-5

Formula: C7H8O/CH3C6H4OH

4-Hydroxy-1-methylbenzene; 4-Methylphenol; para-Hydroxytoluene; 4-Cresol

ILO / WHO chemical safety card

Identity reference only. The source helps identify the substance; it does not establish the composition or classification of a waste stream, or whether it will be accepted for treatment.

Reference notes and technical facts
  • Check the product label and supplier safety data sheet for the substance identity, concentration and formulation.
  • Waste assessment also depends on quantity, container condition, process history, mixing and contamination.

ILO / WHO chemical safety card

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Chemical reference

p-CYMENE

ICSC 0617 · CAS 99-87-6

Formula: C10H14/CH3C6H4CH(CH3)2

1-Methyl-4-isopropylbenzene; Dolcymene; Camphogen

ILO / WHO chemical safety card

Identity reference only. The source helps identify the substance; it does not establish the composition or classification of a waste stream, or whether it will be accepted for treatment.

Reference notes and technical facts
  • Check the product label and supplier safety data sheet for the substance identity, concentration and formulation.
  • Waste assessment also depends on quantity, container condition, process history, mixing and contamination.

ILO / WHO chemical safety card

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Chemical reference

p-NITROPHENOL

ICSC 0066 · CAS 100-02-7

Formula: C6H5NO3

4-Nitrophenol; 4-Hydroxynitrobenzene

ILO / WHO chemical safety card

Identity reference only. The source helps identify the substance; it does not establish the composition or classification of a waste stream, or whether it will be accepted for treatment.

Reference notes and technical facts
  • Check the product label and supplier safety data sheet for the substance identity, concentration and formulation.
  • Waste assessment also depends on quantity, container condition, process history, mixing and contamination.

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Chemical reference

p-NITROTOLUENE

ICSC 0932 · CAS 99-99-0

Formula: C7H7NO2/C6H4(CH3)NO2

4-Nitrotoluene; 1-Methyl-4-nitrobenzene; p-Methylnitrobenzene; PNT

ILO / WHO chemical safety card

Identity reference only. The source helps identify the substance; it does not establish the composition or classification of a waste stream, or whether it will be accepted for treatment.

Reference notes and technical facts
  • Check the product label and supplier safety data sheet for the substance identity, concentration and formulation.
  • Waste assessment also depends on quantity, container condition, process history, mixing and contamination.

ILO / WHO chemical safety card

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Chemical reference

p-OCTYLPHENOL

ICSC 1345 · CAS 1806-26-4

Formula: C14H22O

1-(p-Hydroxyphenyl)octane; Phenol, 4-octyl

ILO / WHO chemical safety card

Identity reference only. The source helps identify the substance; it does not establish the composition or classification of a waste stream, or whether it will be accepted for treatment.

Reference notes and technical facts
  • Check the product label and supplier safety data sheet for the substance identity, concentration and formulation.
  • Waste assessment also depends on quantity, container condition, process history, mixing and contamination.

ILO / WHO chemical safety card

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Chemical reference

p-PHENETIDINE

ICSC 1720 · CAS 156-43-4

Formula: C8H11NO

4-Ethoxyaniline; Ethyl p-aminophenol ; 4-Ethoxybenzenamine; 4-Amino-1-ethoxy benzene

ILO / WHO chemical safety card

Identity reference only. The source helps identify the substance; it does not establish the composition or classification of a waste stream, or whether it will be accepted for treatment.

Reference notes and technical facts
  • Check the product label and supplier safety data sheet for the substance identity, concentration and formulation.
  • Waste assessment also depends on quantity, container condition, process history, mixing and contamination.

ILO / WHO chemical safety card

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Chemical reference

p-PHENYLENEDIAMINE

ICSC 0805 · CAS 106-50-3

Formula: C6H8N2/C6H4(NH2)2

1,4-Diaminobenzene; 1,4-Benzenediamine; p-Aminoaniline

ILO / WHO chemical safety card

Identity reference only. The source helps identify the substance; it does not establish the composition or classification of a waste stream, or whether it will be accepted for treatment.

Reference notes and technical facts
  • Check the product label and supplier safety data sheet for the substance identity, concentration and formulation.
  • Waste assessment also depends on quantity, container condition, process history, mixing and contamination.

ILO / WHO chemical safety card

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Published by Chemical Waste Disposal. Sources checked 12 September 2026. Editorial policy.

If you spot an error in this library, please contact us so we can check the entry against its source.

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The appropriate route for chemical waste depends on the material, concentration, condition, quantity and any contamination. The reference information in this library helps with identification, but it does not confirm that a particular waste will be accepted.

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