Chemical Risk Assessment: Step-by-Step Guide Using an SDS

Learn how to conduct a compliant chemical risk assessment under EU REACH and CLP regulations by systematically extracting key data from Safety Data Sheets.

A Safety Data Sheet (SDS) is not a risk assessment on its own. While an SDS details the intrinsic hazards of a substance or mixture, a chemical risk assessment evaluates how that product is actually handled, stored, and controlled in a specific workplace setting.

Under European Union legislation—specifically the Chemical Agents Directive (Directive 98/24/EC), transposed into national workplace safety laws, alongside the REACH Regulation (EC No 1907/2006) and the CLP Regulation (EC No 1272/2008)—employers are legally required to evaluate chemical risks before work begins. Here is how to complete a chemical risk assessment step by step using your Safety Data Sheet.

Step 1: Validate the SDS Quality and Currency

Before analyzing technical data, verify that the document is valid and up to date:

Step 2: Identify Inherent Hazards (Sections 2 and 3)

Locate the classification of the substance or mixture in Section 2:

Step 3: Evaluate Exposure Potential (Sections 8 and 9)

Hazard indicates potential harm, but risk is a function of hazard multiplied by exposure. To understand exposure pathways (inhalation, dermal absorption, ingestion):

Step 4: Cross-Check Exposure Scenarios (eSDS)

If you receive an extended Safety Data Sheet (eSDS) with attached Exposure Scenarios (ES) under REACH, you must perform a downstream user check:

Step 5: Apply the Hierarchy of Controls (Sections 7 and 8)

Establish protective controls following the hierarchy of controls (often referred to in Europe as the STOP principle: Substitution, Technical controls, Organisational measures, Personal protective equipment):

  1. Elimination / Substitution: Can the process be completed without this chemical, or with a lower-hazard alternative?
  2. Technical & Engineering Controls (Section 8): Implement closed systems, local exhaust ventilation (LEV), or fume hoods.
  3. Organizational Measures (Section 7): Restrict access, reduce shift duration, separate storage of incompatibles, and establish clean-down protocols.
  4. Personal Protective Equipment (Section 8): Specify the exact equipment needed. Do not simply record "gloves"; identify the material, breakthrough time, and thickness specified in Section 8 (e.g., nitrile, minimum 0.4 mm, breakthrough > 480 min).

Step 6: Plan for Emergencies and Waste (Sections 4, 5, 6, and 13)

Conclude the assessment by preparing response mechanisms for worst-case scenarios:

Chemical Risk Assessment Checklist

FAQ

Can an SDS replace a workplace chemical risk assessment?

No. An SDS only outlines product properties, intrinsic hazards, and generic guidance. A risk assessment evaluates actual operational conditions—including physical environment, quantities handled, task duration, exposure routes, and effectiveness of local engineering controls.

Which sections of an SDS are most critical for risk assessment?

Sections 2 (hazard identification), 8 (exposure controls/OELs/PPE), 9 (physical and chemical properties), and 11 (toxicological information) are the core inputs for occupational health assessments. Sections 6, 7, 10, and 13 cover storage, stability, and emergency handling.

What should I do if our actual workplace use is not covered in an Exposure Scenario?

Under REACH, downstream users must act within 12 months if their use is not covered by an extended SDS (eSDS). You can notify your supplier to include the use, modify your process to meet the conditions of an existing scenario, find an alternative chemical, or carry out a Downstream User Chemical Safety Report (DU-CSR).

How often must a chemical risk assessment be reviewed?

Risk assessments must be reviewed periodically, whenever work processes change significantly, following an incident or spill, or when an updated SDS reveals new hazard classifications, lower occupational exposure limits, or modified handling restrictions.

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