What this is
What is a chemical substitution assessment?
What is a chemical substitution assessment?
A chemical substitution assessment compares a substance already in use with a proposed replacement, covering hazard classification, toxicological data, environmental fate, efficacy and the operational side effects of switching. It concludes with a recommendation to substitute, substitute with conditions, or not substitute, and a review date.
Who should carry it out?
A hygienist or occupational health professional competent to read a safety data sheet and toxicological summary, working with the process owner and signed off by quality. A substitution decided on cost or vendor claims alone, without that competence applied to the hazard data, is the recurring failure this template exists to prevent.
How is this different from a chemical risk assessment?
A chemical risk assessment evaluates the risk of using one substance in a specific task. This assessment compares two substances against each other to decide whether the change is worth making at all. Substitution decides whether to switch; a fresh risk assessment follows once the switch is approved.
Scope
When is a chemical substitution assessment required?
This assessment is the record that decides whether replacing a substance is worth doing. It sits upstream of the chemical register update and the risk assessment that follows a substitution, and it should not be used to justify a switch that has already happened.
Use this template when
- A substance is coming under regulatory pressure and a lower-hazard alternative is being considered
- A periodic register review has flagged a candidate for substitution
- A new installation or plant change creates an opportunity to specify a safer substance from the outset
- A complaint, near miss or incident has raised the question of whether a substance should be replaced
- Quality or safety wants a documented comparison before authorising a supplier or process change
Do not use it for
- Chemical Risk Assessment (SAF-086), which assesses the risk of using a chemical for a specific task rather than comparing it against an alternative
- Safety Data Sheet Review (SAF-085), which checks a data sheet already in use is current, not whether the substance should be replaced
- Chemical Approval Request (SAF-091), which gates bringing a genuinely new chemical onto site, rather than the comparative case for replacing one already there
- Restricted Substance Compliance Record (ENV-049), which tracks compliance with a restriction list rather than deciding whether to substitute
- Anything outside KnowEnviro, which belongs in the workspace that owns that process
Compliance mapping
Which ISO 14001 cl.8.1 requirements does this satisfy?
Substitution sits inside the hierarchy of controls both ISO 14001 and ISO 45001 require, and under REACH it is a named legal obligation for substances of very high concern. Defensibility rests on whether the comparison was actually made, not the format used to record it.
| Clause | Requirement | Where it lands |
|---|---|---|
| ISO 14001 cl.8.1 | Operational planning and control applying a life cycle perspective, including substitution as an environmental control measure | Outcome |
| ISO 14001 cl.6.1.2 | Environmental aspects and impacts identified, including those introduced by a change in materials | Wider effects |
| ISO 45001 cl.8.1.2 | Elimination and substitution ranked above engineering, administrative and PPE controls | The alternative |
| ISO 45001 cl.6.1.2.1 | Hazard identification proactive and ongoing, extending to substances proposed for introduction | Current substance |
| ISO 14001 cl.9.1.1 | Monitoring and evaluation of the effectiveness of a control decision, including a stated review point | Outcome |
| ISO 14001 cl.7.5.3 | Documented information controlled and updated, so downstream records reflect the decision taken | Outcome |
What it does not cover
- Chemical Risk Assessment, which assesses the risk of using the chosen substance for a specific task: exposure route, quantity, ventilation, PPE.
- Safety Data Sheet Review, the periodic check that a data sheet already on file remains current, complete and available.
- Chemical Approval Request, the separate gate for a genuinely new chemical arriving on site, with reviews this assessment does not repeat.
- The chemical register entry itself, a linked record that must be updated once a decision is made, not a substitute for making it.
- Management of change, needed when the substitution alters process, storage or waste handling enough to count as a change in its own right.
Global
Chemical Substitution Assessment requirements by country
The duty to consider substitution is strongest where a regime names it as a legal step, rather than leaving it as one item in a general hierarchy of controls.
Control of Substances Hazardous to Health Regulations 2002, reg.7(3)
Exposure must be prevented where reasonably practicable, and otherwise adequately controlled by substitution as the first-ranked measure after elimination.
COSHH names substitution as a distinct step, so an assessment concluding in PPE without recording why substitution was rejected is not compliant on its own terms.
REACH Regulation (EC) 1907/2006, authorisation of substances of very high concern
Substances on the authorisation list require an explicit analysis of alternatives before continued use can be authorised.
For a substance nearing or on the SVHC list, substitution analysis is a specific legal submission, not good practice, and this assessment is the working document behind it.
ISO 14001:2015 cl.8.1 and ISO 45001:2018 cl.8.1.2
Both management system standards require the hierarchy of controls to be applied, with substitution ranked above engineering and administrative controls.
Auditors look for evidence that substitution was actively considered and reasoned through, not listed as a theoretical option above the control actually chosen.
How to complete it
How to complete a chemical substitution assessment, step by step
The form prompts for a hazard comparison field by field. What it cannot force is judging how much weight a missing data point should carry.
Hazard classification, toxicological data and environmental fate are separate fields for a reason. A substitute can score well on classification while its toxicological data is genuinely unknown, and recommending substitution on the strength of the first while the second is unanswered is the most common failure mode.
Efficacy, cost, food contact approval and compatibility all matter, but they are downstream of whether the substitute is actually a lower hazard. A favourable recommendation reached because the substitute is cheaper and works just as well, while the hazard comparison is thin, has answered the easy questions instead of the one that matters.
A vendor's efficacy claim is not verification. Whether the trial happened, and whether it succeeded, are the fields most likely to be backfilled after a decision has already been reached informally, and both belong before the recommendation is written down.
A recommendation that does not immediately update the chemical register and downstream risk assessments has produced a document, not a change. The gap between decision and update is where a site keeps working to the old assessment while believing the new one applies.
What auditors find
Most common chemical substitution assessment findings
Because this is a singleton record per workspace, its findings tend to concern whether the comparison behind the last recommendation still holds, not whether the document exists.
| Finding | Clause | What fixes it |
|---|---|---|
| Substitution recommended on classification alone; toxicological data marked not applicable with no further data sought. | ISO 14001 cl.8.1 | Require a stated reason wherever toxicological data is marked not applicable, and route genuinely unknown data to inquiry before recommending. |
| New storage requirement or waste stream created by the substitute not carried into storage or waste procedures. | ISO 14001 cl.6.1.2 | Treat a yes on either field as triggering an immediate update to the storage check and waste procedure, not a note for later. |
| Trial not carried out, or recorded as not trialled, before the substitution was already put into use on the floor. | ISO 45001 cl.8.1.2 | Block general use until the trial field shows a completed, successful trial or a documented reason it was waived. |
| Chemical register and downstream risk assessments not updated after a recommendation to substitute. | ISO 14001 cl.7.5.3 | Make the register and assessment updates part of closing the record, not a separate action raised afterwards. |
| Regulatory pressure recorded as a trigger but not linked to the specific restriction or deadline driving it. | REACH Regulation (EC) 1907/2006 | Name the restriction or authorisation list and date in the reason field, so the review date matches the actual deadline. |
| Food contact approval left unanswered for a substitute later found in a food-contact-adjacent process. | ISO 14001 cl.8.1 | Answer food contact approval against actual intended use, not the use the requester expects, and escalate where uncertain. |
Case in point
Case in point: the substitution that traded a documented risk for an unknown one
A site under pressure to cut solvent emissions replaced a long-used degreaser with a water-based product marketed as low-hazard. Classification looked favourable, cost was lower, and a short trial showed it cleaned adequately. The assessment recommended substitution and the old solvent was withdrawn within a month.
Within a year, several operators reported skin irritation. An occupational health review found the new sheet's toxicological section was mostly not available entries, not not hazardous ones, for the endpoints that mattered on that line. The toxicological data field on the original assessment had been marked not applicable, because the classification looked clean and nobody had gone looking for the gap it concealed. The incumbent's hazards had been documented for decades; the replacement's simply had not been studied.
The template
The template, field by field
The form exactly as it installs. Every field, option, score and conditional rule is editable, and the links to other templates come with it.
5 sections
- Reference
- ENV-048
- Archetype
- Assessment
- Record ID
- CSA-2026-000
- Scoring
- Substitutions made
- Direction
- High is good
- Singleton
- Yes
- Basis
- ISO 14001 cl.8.1
- Links
- Links Chemical register, Exposure control
- Tags
- Chemicals
- Sections
- 5
- Fields
- 42
- Follow up fields
- 3
- Repeating sections
- 0
- Links out
- 3
Header
10 fieldsAssessment ID*
Auto sequence. Format CSA-2026-000.
The record's own ID. Other templates point at this value.
Status*
Drives who this goes to next.
- Planned2 pts
- In progress2 pts
- Complete3 pts
- Deferred0 pts
- Open0 pts
- Closed3 pts
- Overdue0 pts
Date and Time*
Completed By*
Site*
Site ID*
Format SITE-000.
Links to FDN-001 Site ID
Substance Considered*
Substance ID
Links to FDN-006 Substance ID
Assessment Trigger*
Substitutes Can Trade A Known Hazard For An Unstudied One
Replacing a well characterised chemical with a newer one sometimes swaps a documented risk for one nobody has data on yet. Ask what is known about the replacement.
Current substance
6 fieldsHazard Classification Understood*
- Yes3 pts
- Partly1 pt
- No0 pts
Exposure Currently Controlled*
- Yes3 pts
- Partly1 pt
- No0 pts
Environmental Impact Understood*
- Yes3 pts
- Partly1 pt
- No0 pts
Regulatory Pressure On It*
- Yes3 pts
- Partly1 pt
- No0 pts
Quantity Used Significant*
- Yes3 pts
- Partly1 pt
- No0 pts
Alternatives Exist*
- Yes3 pts
- Partly1 pt
- No0 pts
The alternative
6 fieldsLower Hazard Classification*
- Yes3 pts
- Partly1 pt
- No0 pts
Toxicological Data Available*
- Yes2 pts
- No0 pts
- N/Aexcluded from denominator
Environmental Fate Understood*
- Yes3 pts
- Partly1 pt
- No0 pts
Efficacy Verified For Our Use*
- Yes2 pts
- No0 pts
- N/Aexcluded from denominator
Food Contact Approval Where Needed*
- Yes3 pts
- Partly1 pt
- No0 pts
Compatible With Our Materials*
- Yes3 pts
- Partly1 pt
- No0 pts
Wider effects
6 fieldsExposure Route Changed*
- Yes2 pts
- No0 pts
- N/Aexcluded from denominator
New Storage Requirements*
- Yes3 pts
- Partly1 pt
- No0 pts
New Waste Stream Created*
- Yes3 pts
- Partly1 pt
- No0 pts
Cost Impact Acceptable*
- Yes3 pts
- Partly1 pt
- No0 pts
Training Requirement Created*
- Yes3 pts
- Partly1 pt
- No0 pts
Trial Carried Out*
- Yes3 pts
- Partly1 pt
- No0 pts
Outcome
14 fieldsSubstitution Recommended*
- Yes3 pts
- With conditions2 pts
- No1 pt
Reason
Trial Successful*
- Yes3 pts
- Partly1 pt
- No0 pts
- Not trialled1 pt
Chemical Register Updated*
- Yes3 pts
- No0 pts
Assessments Updated*
- Yes3 pts
- Partly1 pt
- No0 pts
Review Date*
Action Required*
Raise the action record, then enter its reference here.
- No2 pts
- Yes0 pts
Priority
- High0 pts
- Medium1 pt
- Low3 pts
CAPA ID
Format CAPA-2026-00000.
Links to FDN-014 CAPA ID
Action Owner
Hygienist*
Signature*
Quality Manager*
Second Signature*
ENV-048 · record IDs look like CSA-2026-000 · Links Chemical register, Exposure control
Open in KnowellaRun it with agents
From a document you fill in to a programme that runs itself
The comparison itself is a document. What actually slips is the toxicological gap nobody chased, and the register update that lags the decision it was meant to record.
Holds the substitution library against the chemical register, flags recommendations where the register or assessments have not been updated, and tracks review dates against regulatory deadlines.
Carries a substitution recommendation into the chemical risk assessment the new substance will need, so the two records stay linked.
Checks food contact and compatibility answers against the processes the substance is actually used in, not the use stated at assessment.
Watches for toxicological data marked not applicable without reason, and holds a substitution recommendation for review before it reaches the register.
This template lives in KnowEnviro — environment and energy. Aspects, permits, waste, emissions, spills and sustainability reporting.
Meet KnowEnviro→Glossary
Chemical Substitution Assessment definitions and key terms
- Substitution
- Replacing a hazardous substance, process or equipment with a less hazardous one, ranked above engineering and administrative controls.
- Substance of very high concern
- A REACH designation for properties such as carcinogenicity or persistence, subject to authorisation and a legal duty to analyse substitution.
- Toxicological data gap
- A point where the available data does not establish that a substance is safe or unsafe, distinct from data that positively shows low hazard.
- Environmental fate
- What happens to a substance once released: whether it persists, degrades, bioaccumulates or breaks into other substances of concern.
- Like-for-like
- A substitution changing nothing about exposure route, storage, waste handling or process, distinct from one needing its own change control.
FAQ
Frequently asked questions about chemical substitution assessment
Does a lower GHS classification mean the substitute is safer?+
Not on its own. A newer substance can carry a lower classification simply because fewer studies have been run against it. The assessment needs both the classification and the toxicological data field answered before that conclusion holds.
When do we need this assessment rather than a chemical risk assessment?+
When the question is whether to replace a substance at all. Once that decision is made, a fresh chemical risk assessment is still needed for the substitute's actual task-level use, which this assessment does not do.
What if no toxicological data exists for the candidate?+
That is itself a finding, not a reason to mark the field not applicable. Record what is genuinely unknown and weigh that gap against the certainty of the hazard it would remove, rather than treating absence of data as absence of hazard.
Should the substitute be trialled before or after the recommendation is written?+
Before. A recommendation based on a vendor's efficacy claim rather than a verified trial is the recurring failure this template is built to catch, and the trial fields exist to make that sequence visible.
Who has to sign off a substitution?+
The hygienist who carried out the comparison and a quality manager, both by signature. The hygienist owns the hazard judgement; quality owns whether the change is controlled once it reaches the process.
What happens if the substitute creates a new waste stream?+
That answer should stop the assessment being treated as a simple like-for-like swap. A new waste stream needs its disposal route confirmed before use, not sorted out afterwards as an unpermitted discharge.
Keep going
Related templates and programmes
Industries this is written for
Programmes this belongs to
Used together in Chemical Safety and WHMIS
Spill Report
Records a release of chemical, fuel, oil or wastewater
Spill Response Record
Records what was done to contain, clean up and dispose of a spill
Restricted Substance Compliance Record
Records compliance with restricted substance obligations covering ozone depleting gases, persistent chemicals and packaging materials
Explosive Atmosphere Zoning Record
Records the zoning of areas where flammable dust or vapour can form an explosive atmosphere, and the equipment permitted there
Chemical and Substance Register
Lists every chemical and hazardous substance held on site, with quantity, location and hazard class
Chemical Inventory Record
Records what chemicals are held where, in what quantity and in what container
More in Chemicals and Substances
Restricted Substance Compliance Record
Records compliance with restricted substance obligations covering ozone depleting gases, persistent chemicals and packaging materials
Explosive Atmosphere Zoning Record
Records the zoning of areas where flammable dust or vapour can form an explosive atmosphere, and the equipment permitted there
Written and reviewed by
Siddarth Singh
Founder & Chief Executive Officer, Knowella
Certified Safety Professional and industrial and systems engineer with more than a decade inside food supply chain, freight and manufacturing operations. This page was written against the current text of the standards it cites, not against secondary summaries of them.
- Certified Safety Professional (CSP), Board of Certified Safety Professionals
- MBA, University of Chicago Booth School of Business
- MS and BS, The Ohio State University, Industrial and Systems Engineering
- Six Sigma Black Belt
Sources and last review. Reviewed 16 August 2026 against:
- ISO 14001:2015, clauses 6.1.2, 8.1 and 9.1.1
- ISO 45001:2018, clause 8.1.2 on the hierarchy of controls
- Control of Substances Hazardous to Health Regulations 2002, regulation 7(3) (GB)
- REACH Regulation (EC) 1907/2006, Title VII, authorisation of substances of very high concern
This page is general guidance, not legal advice. Confirm requirements with your jurisdiction’s regulator.