Controlled Chemicals

The Chemical Weapons Convention lists 3 schedules of toxic chemicals, their precursors and an additional category of chemicals known as unscheduled discrete organic chemicals (DOCs).

The schedules are organised to reflect the risk posed by the chemical to the objectives of the Convention, with decreasing risk across the schedules. Although DOCs are not directly related to making chemical agents, the facilities built for their production (with quantity exceeding threshold limits) can potentially be converted to chemical weapons production facilities.

Schedule Chemicals

Schedule	Description	Examples	Possible products categories
1	Schedule 1 covers chemicals that possess lethal or incapacitating toxicity and other properties that would enable it to be used as a chemical weapon (Schedule 1A), and their final stage precursors (Schedule 1B). They pose a high risk to the objectives of the Convention and have little or no commercial application.	Sarin Saxitoxin Ricin	- Flame-retardant additive research (plastics, resins, fibres) - Medicinal & pharmaceutical preparations
2	Schedule 2 covers chemicals which are potential chemical warfare agents (Schedule 2A and 2A*), and other chemical weapons precursors (Schedule 2B). They pose a significant risk to the objectives of the Convention and have moderate level of commercial application.	Methylphosphonyl dichloride Arsenic trichloride	- Insecticides - Herbicides - Epoxy resins - Flame-retardant additive research (plastics, resins, fibres) - Medicinal & pharmaceutical preparations - Metal plating preparations
3	Schedule 3 covers chemicals which had previously been produced, stockpiled or used as a chemical weapon. They pose a risk to the objectives of the Convention by virtue of its importance in the production of one or more chemicals listed in Schedule 1 or Schedule 2B. Schedule 3 chemicals have widespread commercial application.	Triethanolamine Methyldiethanolamine	- Pesticides - Insecticides - Toiletries - Pharmaceutical - Metal plating preparations - Surfactants for detergents, oil drilling emulsions - Corrosion inhibitors - Soil fumigants

See full list of scheduled chemicals.

Unscheduled Discrete Organic Chemicals (DOCs)

An unscheduled discrete organic chemical (DOCs) refers to any chemical that belongs to the class of chemical compounds consisting of all compounds of carbon, except for its oxides, sulfides and metal carbonates. It is identifiable by name, structural formula (if known), and Chemical Abstracts Service (CAS) Registry Number (if assigned). It excludes

- Oligomers and polymers whether or not containing phosphorus, sulfur or fluorine
- Chemicals containing only carbon and metal
- Carbon monoxide and carbon dioxide (referred to as “oxides of carbon” in the above definition)
- Carbon disulfide or carbonyl sulfide (referred to as “sulfides of carbon” in the above definition)

There are 2 types of DOCs

- PSF-containing DOCs (Those that contain phosphorus, sulphur or fluorine)
- Non PSF-containing DOCs (Those that do not contain phosphorus, sulphur or fluorine)
Determining if your product is controlled
Please refer to the list of scheduled chemicals to check if your product is controlled by the NA(CWC).

You may also check using the description of the goods, Harmonized System (HS) code or Competent Authority (CA) product code on this search engine. If the HS code is subject to control, the name of the CA and the chemical(s) that the CA controls will be indicated. You may check directly with the respective CAs on their licensing requirements.

If you require further assistance to determine if your product is controlled, please fill out the Product Enquiry Form under “Chemical Weapons Convention Forms” on the Customs Forms & Service Links page, and attach the relevant supporting documents (such as Safety Data Sheet and Certificate of Analysis).

The following information are required when filling out the form

- Particulars of applicant
- Activities involved
- HS codes of product
- Safety Data Sheet/Certificate of Analysis of product
- Intended use of product

For submission of multiple files, please zip the documents and submit as a single file in the appropriate form. For files that are larger than 7MB, you may submit your supporting documents via
1. Email - customs_nacwc@customs.gov.sg
2. Mail -
  Singapore Customs
  National Authority (Chemical Weapons Convention)
  55 Newton Road #06-02
  Revenue House
  Singapore 307987