What is the difference between COSHH and DSEAR?

COSHH covers all hazardous substances that can cause ill health, such as chemicals, fumes, and dusts. DSEAR (Dangerous Substances and Explosive Atmospheres Regulations) specifically deals with substances that can cause fires or explosions, like flammable solvents or gases. While they overlap, COSHH focuses on health risks, and DSEAR on safety risks from fire/explosion.

Do I need to do a COSHH risk assessment for every substance?

Yes, if the substance is hazardous to health. However, you can group similar substances (e.g., all cleaning agents) if they have the same hazards and controls. The assessment must be 'suitable and sufficient', meaning it should identify significant risks and be proportionate to the hazard level.

How often should COSHH risk assessments be reviewed?

There is no fixed interval, but reviews should happen when there is a change in the substance, process, or workplace, or if new information becomes available (e.g., updated SDS). As a rule of thumb, review at least annually to ensure controls remain effective.

What are the most common hazardous substances in manufacturing?

Common ones include metalworking fluids (causing dermatitis and respiratory issues), welding fumes (containing carcinogens like hexavalent chromium), solvents (e.g., toluene for degreasing), and dusts (e.g., wood dust from sanding). Each requires specific controls like LEV, PPE, or substitution.

Can I use a substance without a safety data sheet?

No. Under REACH, suppliers must provide an SDS for hazardous substances. If you don't have one, you cannot assume the substance is safe. You should request the SDS from the supplier or stop using the substance until you have the necessary information to assess risks.

What is health surveillance and when is it required?

Health surveillance is a system of regular checks (e.g., lung function tests, skin inspections) to detect early signs of ill health from workplace exposure. It is required when exposure to certain substances (e.g., respiratory sensitizers like isocyanates, or carcinogens) is likely, and there is a valid technique for detecting effects. It helps protect workers and confirms control measures are working.

Principles of the Control of Substances Hazardous to Health

QUALIFICATIONS NETWORK

vocational

This element covers the core principles underpinning the Control of Substances Hazardous to Health (COSHH) Regulations. It equips learners with the ability to interpret legal duties, conduct proportionate risk assessments, and implement effective control measures to prevent occupational ill-health from hazardous substances. Practical application focuses on integrating these principles into everyday workplace safety management systems.

Learning Outcomes

Assessment Guidance

Key Skills

Key Terms

Assessment Criteria

Assessment criteria

QNUK Level 2 Award in Principles of COSHH (RQF)

Topic Overview

The QNUK Level 2 Award in Principles of COSHH (RQF) is a foundational qualification for anyone working in manufacturing and engineering where hazardous substances are present. It covers the legal requirements of the Control of Substances Hazardous to Health (COSHH) Regulations 2002, including how to identify health hazards, assess risks, and implement control measures. This award is essential for ensuring workplace safety and compliance with UK health and safety law.

In manufacturing and engineering, workers frequently encounter substances like metalworking fluids, welding fumes, solvents, and cleaning agents. Understanding COSHH principles helps prevent occupational diseases such as dermatitis, asthma, and cancer. The course teaches students to interpret safety data sheets (SDS), recognize hazard symbols, and apply the hierarchy of control—from elimination to personal protective equipment (PPE). Mastering these principles not only protects individuals but also reduces employer liability and improves overall safety culture.

This qualification fits into broader health and safety frameworks, complementing other awards like IOSH Managing Safely or NEBOSH General Certificate. It is often a prerequisite for roles involving chemical handling, maintenance, or quality control. By the end of the course, students should be able to contribute to risk assessments and confidently use control measures in their daily work.

Key Concepts

Core ideas you must understand for this topic

→The COSHH hierarchy of control: elimination, substitution, engineering controls (e.g., local exhaust ventilation), administrative controls (e.g., safe systems of work), and PPE as the last resort.
→Routes of entry: inhalation, ingestion, skin absorption, and injection—each requiring different control strategies.
→Interpretation of safety data sheets (SDS) and hazard labels, including GHS pictograms, signal words, and H/P statements.
→Risk assessment process: identifying hazards, deciding who might be harmed, evaluating risks, recording findings, and reviewing regularly.
→Health surveillance: when it is required (e.g., for exposure to respiratory sensitizers or carcinogens) and what it involves.

Learning Objectives

What you need to know and understand

Understand the law relating to hazardous substances in the workplace, Understand how risk assessments contribute to the safe use of hazardous substances in the workplace, Understand the precautions and procedures necessary to ensure the risks associated with hazardous substances are properly controlled

Assessment Criteria

Key criteria assessors look for in your portfolio

Award credit for demonstrating the ability to differentiate between hazard and risk and apply this distinction to real workplace substances.
Credit responses that accurately identify the key requirements of the COSHH Regulations, including employer and employee duties.
Look for evidence of applying the hierarchy of controls (elimination, substitution, engineering controls, administrative controls, PPE) to a given scenario.
Assessors should reward candidates who explain the purpose and process of a COSHH risk assessment, including identifying routes of entry and evaluating exposure.

Assessment Guidance

Guidance for achieving higher grades

💡When answering questions on legal duties, cite specific regulations (e.g., COSHH Regulation 6 for risk assessment) to demonstrate depth of understanding.
💡Use workplace examples to illustrate principles; for instance, comparing control measures for a cleaning product versus a laboratory reagent.
💡In risk assessment tasks, follow a structured format: substance identification, hazard classification, persons at risk, exposure evaluation, control measures, and residual risk.
💡Always link control measures to the hierarchy of control in your answers. Examiners look for evidence that you understand the priority order, not just a list of controls.
💡Use specific examples from manufacturing/engineering, such as 'local exhaust ventilation for welding fumes' or 'substituting a solvent-based cleaner with a water-based one'. This shows applied knowledge.
💡When discussing risk assessment, mention the five steps and include key details like 'review periodically or when changes occur'. Avoid vague statements like 'do a risk assessment'.

Common Mistakes

Common errors to avoid in your coursework

Confusing ‘hazard’ (the potential to cause harm) with ‘risk’ (the likelihood of harm occurring).
Assuming that personal protective equipment (PPE) is the first line of defense rather than the last resort in the hierarchy of controls.
Failing to consider all routes of exposure, such as absorption through the skin or ingestion, focusing solely on inhalation.
Misconception: 'PPE is the most important control measure.' Correction: PPE is the least effective control and should only be used when other measures cannot reduce risk to an acceptable level. The hierarchy places elimination and substitution above PPE.
Misconception: 'If a substance has a safety data sheet, it is safe to use.' Correction: An SDS provides hazard information, not safety assurance. It must be used to assess risks and implement controls.
Misconception: 'COSHH only applies to chemicals.' Correction: COSHH covers all hazardous substances, including biological agents (e.g., bacteria), dusts (e.g., wood dust), and fumes (e.g., welding fumes).

Frequently Asked Questions

Common questions students ask about this topic

Before You Start

Prior knowledge that will help with this topic

•Basic understanding of health and safety responsibilities in the workplace (e.g., Health and Safety at Work Act 1974).
•Familiarity with common workplace hazards in manufacturing or engineering environments.
•Ability to read and interpret safety data sheets (basic literacy skills).

Key Terminology

Essential terms to know

Understand the law relating to hazardous substances in the workplace, Understand how risk assessments contribute to the safe use of hazardous substances in the workplace, Understand the precautions and procedures necessary to ensure the risks associated with hazardous substances are properly controlled

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Principles of the Control of Substances Hazardous to Health

Assessment criteria

Topic Overview

Key Concepts

Learning Objectives

Assessment Criteria

Assessment Guidance

Common Mistakes

Frequently Asked Questions

Before You Start

Key Terminology

Ready to learn?

Related Topics in QUALIFICATIONS NETWORK vocational Manufacturing & Engineering

The Principles of Risk Assessment

Fire Safety Awareness

Risk Assessment – Principles and Practice

Manual Handling Risk Assessment

Topic Synopsis

Key Concepts & Core Principles

Exam Tips & Revision Strategies

Common Misconceptions & Mistakes to Avoid

Examiner Marking Points

Principles of the Control of Substances Hazardous to Health

Assessment criteria

Topic Overview

Key Concepts

Learning Objectives

Assessment Criteria

Assessment Guidance

Common Mistakes

Frequently Asked Questions

What is the difference between COSHH and DSEAR?

Do I need to do a COSHH risk assessment for every substance?

How often should COSHH risk assessments be reviewed?

What are the most common hazardous substances in manufacturing?

Can I use a substance without a safety data sheet?

What is health surveillance and when is it required?

Before You Start

Key Terminology

Ready to learn?

Related Topics in QUALIFICATIONS NETWORK vocational Manufacturing & Engineering

The Principles of Risk Assessment

Fire Safety Awareness

Risk Assessment – Principles and Practice

Manual Handling Risk Assessment