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Nanomaterials in Canada: New CEPA 2026 Framework and its Regulatory Impact
- Daniel Jiménez
- 14 hours ago
- 3 min read
In March 2026, the Government of Canada published a new framework for the risk assessment of nanomaterials under the Canadian Environmental Protection Act (CEPA).
At first glance, it might seem like just another technical update. However, this document marks a significant evolution in how authorities expect companies to assess and document the safety of nanomaterials.
Table of contents
What really changes with the new nanomaterials framework in Canada?
One of the most relevant aspects is that no new specific regulation has been created for nanomaterials .
Instead, Canada has opted for:
Maintaining the existing framework (CEPA)
Adapting it to the particularities of materials at the nanoscale
This approach follows the OECD line and confirms a global trend: 👉 there won't be completely new laws, but there will be much more demanding technical requirements.
Nanomaterials: why they cannot be evaluated like conventional substances
The framework makes it clear that nanomaterials exhibit properties that cannot be predicted from their "bulk" form.
Factors such as:
particle size
shape
surface chemistry
can completely modify:
toxicity
bioavailability
environmental behavior
Furthermore, the document highlights that the CAS number is not sufficient to identify the actual risk .
In practice: two materials with the same CAS number may require different regulatory assessments.
Nanoform assessment: the major regulatory shift
One of the most important changes is the focus on individual nanoforms .
This means that:
It is no longer enough to simply evaluate the substance
It is necessary to evaluate each relevant nano variant.
To that end, the authorities expect detailed information on:
size distribution
shape of the particles
surface characteristics
This level of characterization will become increasingly key in regulatory dossiers.
Life cycle and transformation of nanomaterials
The framework places special emphasis on a critical aspect: nanomaterials change throughout their life cycle .
During use they may:
to aggregate or cluster
dissolve
reacting to the environment
This directly affects exposure and risk.
Therefore, the evaluation should no longer focus solely on the original material, but on its behavior under real conditions.
New challenges: metrics and lack of consensus
Another relevant point is the lack of international harmonization.
Unlike traditional substances, in nanomaterials the effect can depend on:
number of particles
surface
volume
This complicates things:
comparison of studies
data generation
the regulatory justification
What happens when there is not enough data?
The document confirms the usual approach in regulation:
use of read-across
weight of evidence
predictive models
application of the precautionary principle
In other words: if there is no data, uncertainty works against the company.
Conclusion: more technical requirements, not more regulation
The new Canadian framework does not introduce new direct legal obligations, but it does significantly raise the expected technical level.
This reflects a clear global trend:
The regulation of nanomaterials will become increasingly demanding in scientific terms
For companies, this means that the evaluation of nanomaterials ceases to be a theoretical exercise and becomes a key strategic element in market access.
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