What Data Is Required for REACH Registration?

A Beginner-Friendly Guide to REACH Information Requirements

Once a company understands how the REACH registration process works, the next important question is:

What information do I actually need to submit when registering a chemical substance?

Under the REACH Regulation (EC) No 1907/2006, companies must provide information about the intrinsic properties of a substance to demonstrate that it can be used safely for human health and the environment.

The information is submitted as part of a registration dossier, which includes a technical dossier and, for higher tonnage substances, a Chemical Safety Report (CSR).

One important concept to understand is that the amount of data required depends on how much of the substance is manufactured or imported each year. As the tonnage increases, the regulatory authorities require more detailed information about potential hazards and environmental impacts.

Understanding the Types of Data Required

REACH requires companies to gather information from several scientific areas. These data help regulators understand how a substance behaves and whether it could cause harm.

The main categories of information include:

Physical and Chemical Properties

These studies describe the basic physical characteristics of a substance. They help determine how the substance behaves during storage, transport, and use.

Typical examples include:

• Melting or freezing point
  
  

• Boiling point
  
  

• Density
  
  

• Vapour pressure
  
  

• Water solubility
  
  

• Flammability and explosive properties
  
  

These properties are important for identifying hazards such as fire risks or chemical instability

Toxicological Data (Effects on Human Health)

Toxicology studies examine whether a substance could cause harm to people during exposure.

Some examples of toxicological endpoints include:

• Skin irritation or corrosion – Does the chemical damage skin?
  
  

• Eye irritation – Can it harm the eyes?
  
  

• Skin sensitisation – Can it cause allergic reactions?
  
  

• Acute toxicity – What happens if someone swallows, inhales, or absorbs the chemical?
  
  

• Genetic toxicity – Can the substance damage DNA?
  
  

For higher tonnage substances, additional studies may evaluate repeated exposure effects, reproductive toxicity, or developmental toxicity.

Ecotoxicological Data (Environmental Effects)

Ecotoxicology studies evaluate how a substance may affect organisms in the environment.

Examples include:

• Toxicity to fish
  
  

• Toxicity to aquatic invertebrates
  
  

• Effects on algae and aquatic plants
  
  

These tests help determine whether the substance could harm aquatic ecosystems or wildlife.

Environmental Fate and Behaviour

Another important part of REACH data is understanding what happens to the substance after it enters the environment.

Typical endpoints include:

• Biodegradability – Does the substance break down naturally?
  
  

• Bioaccumulation – Can it build up in living organisms?
  
  

• Degradation and hydrolysis – How does it transform over time?
  
  

These studies help regulators understand whether a substance could persist in the environment or accumulate in food chains.

Information on Uses and Exposure

In addition to hazard data, companies must describe how the substance is used and how exposure may occur.

This may include:

• Industrial uses
  
  

• Professional uses
  
  

• Consumer uses
  
  

• Routes of exposure (inhalation, skin contact, etc.)
  
  

This information allows regulators to evaluate whether the risks of using the substance are adequately controlled.

How Data Requirements Increase with Tonnage

REACH divides registration requirements into four tonnage bands, each linked to specific annexes of the regulation. As the annual production or import volume increases, the amount of information required also increases.

Substances Registered at 1–10 Tonnes per Year

For substances in the lowest tonnage band, companies must submit a basic set of data defined in Annex VII of REACH.

This includes:

• Physicochemical properties
  
  

• Basic toxicological information
  
  

• Basic ecotoxicological studies
  
  

Examples include:

• Skin irritation tests
  
  

• Eye irritation studies
  
  

• Acute oral toxicity
  
  

• Short-term aquatic toxicity studies
  
  

• Biodegradability screening
  
  

At this level, the goal is to identify basic hazards associated with the substance.

Substances Registered at 10–100 Tonnes per Year

When the volume increases, additional studies become necessary.

These may include:

• Mutagenicity testing in mammalian cells
  
  

• Acute inhalation toxicity
  
  

• Short-term repeated dose toxicity (28-day study)
  
  

• Screening tests for reproductive or developmental toxicity
  
  

• Additional environmental studies such as adsorption or degradation tests
  
  

For substances in this tonnage band, companies must also prepare a Chemical Safety Report, which evaluates risks and describes how they can be controlled.

Substances Registered at 100–1000 Tonnes per Year

At higher production volumes, regulators require more comprehensive hazard data.

Examples of additional studies include:

• Sub-chronic toxicity studies (90-day repeated dose studies)
  
  

• Developmental toxicity studies
  
  

• Long-term aquatic toxicity studies
  
  

• Bioaccumulation testing
  
  

These studies provide deeper insight into long-term health and environmental risks.

Substances Registered at 1000 Tonnes or More per Year

For substances produced or imported in very large volumes, the most extensive information requirements apply.

These may include:

• Long-term repeated dose toxicity studies
  
  

• Extended reproductive toxicity studies
  
  

• Carcinogenicity studies (if triggered)
  
  

• Long-term environmental toxicity studies
  
  

The goal is to ensure that substances produced in large volumes with potentially widespread exposure are thoroughly assessed.

The Role of the Chemical Safety Report

For substances registered at 10 tonnes per year or more, companies must perform a Chemical Safety Assessment and document the results in a Chemical Safety Report (CSR).

The CSR evaluates:

• Identified hazards
  
  

• Exposure scenarios
  
  

• Risk management measures
  
  

• Whether the substance can be used safely under defined conditions.
  
  

This report plays an important role in demonstrating that risks are adequately controlled throughout the supply chain.

Why Understanding REACH Data Requirements Matters

The information required for REACH registration is not just a regulatory formality. It forms the scientific basis for chemical safety in the European market.

By collecting and evaluating these data, companies can:

• Identify potential hazards of their substances
  
  

• Develop safer handling procedures
  
  

• Provide accurate safety information to downstream users
  
  

• Ensure compliance with EU chemical regulations
  
  

For companies planning to manufacture or import chemicals in the EU, understanding these data requirements is essential for successful REACH registration and long-term regulatory compliance.