Zentek cleared to sell ZenGUARD air filters in Canada

Accepted by SEC EDGAR 05/06/2026 - 01:21 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Zentek Ltd. received a revised classification from Health Canada’s Pesticides Regulatory Directorate confirming that its ZenGUARD™ Enhanced Air Filters are not regulated under the Pest Control Products Act because they operate through a mechanical mode of action. This conditional classification resolves the Canadian regulatory question previously highlighted in February 2026.

With this decision, Zentek is now accepting Canadian commercial orders for ZenGUARD™ Enhanced Air Filters and pursuing additional commercialization routes, including federal procurement, licensing, and sales of ZenGUARD™-coated filter media to HVAC supply‑chain participants. ZenGUARD™ uses a patented graphene-based coating, independently validated to deliver MERV 9 filtration under ASHRAE 52.2 with pressure drop comparable to uncoated filters, and is protected in Canada by a patent granted in 2022 with a term to 2041.

Positive

• Health Canada classification clears Canadian market pathway: ZenGUARD™ Enhanced Air Filters are classified as not subject to regulation under the Pest Control Products Act, resolving a previously disclosed regulatory matter and allowing Zentek to accept Canadian commercial orders.
• Multiple commercialization channels identified: Zentek is pursuing direct sales, potential federal procurement under Innovative Solutions Canada’s Pathway to Commercialization, licensing, and coated filter media sales, providing several routes to monetize ZenGUARD™.
• Patented technology with validated performance: ZenGUARD™ is protected by a Canadian patent granted in 2022 with a term to 2041 and is independently validated under ASHRAE 52.2 to deliver MERV 9 filtration with pressure drop equivalent to uncoated filters.

Negative

• None.

Insights

Regulatory and commercialization analyst

Health Canada’s classification removes a key regulatory hurdle and opens Canadian sales for ZenGUARD™ air filters.

The classification by Health Canada’s Pesticides Regulatory Directorate that ZenGUARD™ Enhanced Air Filters are not subject to the Pest Control Products Act removes a major uncertainty around their Canadian market pathway. The filing states this decision resolves the regulatory matter previously disclosed in February 2026.

This allows Zentek to begin accepting commercial orders in Canada and to pursue federal procurement, licensing, and coated-media sales. The conditional nature of the classification means design, usage, or marketing changes could trigger reassessment, so maintaining compliance with the current configuration will be important for sustaining these commercialization efforts.

Key Figures

Health Canada classification basis: Section 3(1)(a) exemption Commercial energy share: 13% of Canada’s secondary energy use Filter performance rating: MERV 9 +3 more

6 metrics

Health Canada classification basis Section 3(1)(a) exemption ZenGUARD™ deemed not subject to Pest Control Products Act

Commercial energy share 13% of Canada’s secondary energy use Commercial and institutional buildings’ share cited from federal data

Filter performance rating MERV 9 ZenGUARD™ Enhanced Air Filters tested under ASHRAE Standard 52.2

Canadian patent term To 2041 ZenGUARD™ Canadian patent granted in 2022 for PPE and HVAC

Airflow performance Equivalent pressure drop ZenGUARD™ filters match uncoated filters at standard and high airflow

PEA target timing Summer 2026 Albany graphite asset advancing toward Preliminary Economic Assessment

Key Terms

Pesticides Regulatory Directorate, Pest Control Products Act, ASHRAE Standard 52.2, MERV 9, +2 more

6 terms

Pesticides Regulatory Directorate regulatory

"received a revised classification by Health Canada's Pesticides Regulatory Directorate"

A pesticides regulatory directorate is a government or agency unit responsible for reviewing, approving and monitoring chemical products used to control pests, similar to a safety inspector for pesticides. Investors care because its decisions determine whether a pesticide can be sold, how it must be labeled and used, and what restrictions or recalls may be required — outcomes that directly affect sales, costs, legal risks and market access for companies in the agrochemical and food sectors.

Pest Control Products Act regulatory

"not subject to regulation under the Pest Control Products Act"

A Pest Control Products Act is a government law that sets rules for approving, labeling, selling and using chemical or biological products meant to control pests. For investors, it matters because the law determines whether a product can reach the market, what safety testing and warnings are required, and what penalties or recalls a company might face—similar to how traffic rules determine whether a car model can be legally driven and sold.

ASHRAE Standard 52.2 technical

"tested in accordance with ASHRAE Standard 52.2"

ASHRAE Standard 52.2 is a laboratory test method that measures how well air filters remove particles of different sizes from HVAC systems, and it is the basis for assigning MERV efficiency ratings. For investors, it matters because compliance and higher MERV ratings affect product demand, building operating costs, regulatory approvals, and liability exposure—similar to a safety score for filters that can drive sales or require upgrades in commercial and industrial properties.

MERV 9 technical

"independently validated under ASHRAE 52.2, MERV 9 filtration"

Pathway to Commercialization regulatory

"Innovative Solutions Canada's Pathway to Commercialization"

graphene-enhanced media technical

"leverage patented graphene-enhanced media tested in accordance"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Health Canada decide about Zentek (ZTEK) ZenGUARD™ Enhanced Air Filters?

Health Canada’s Pesticides Regulatory Directorate classified ZenGUARD™ Enhanced Air Filters as not subject to regulation under the Pest Control Products Act. The product is exempt under section 3(1)(a) because it operates through a mechanical mode of action, resolving Zentek’s previously disclosed Canadian regulatory matter.

Can Zentek (ZTEK) now sell ZenGUARD™ Enhanced Air Filters commercially in Canada?

Yes. Following Health Canada’s classification, Zentek is accepting Canadian commercial orders for ZenGUARD™ Enhanced Air Filters. The company is targeting commercial, institutional, healthcare, and industrial customers, while also exploring federal procurement, licensing, and sales of ZenGUARD™-enhanced filter media within the HVAC supply chain.

How do Zentek (ZTEK) ZenGUARD™ Enhanced Air Filters differ from conventional filters?

ZenGUARD™ is applied as a graphene-based coating to filter media to enhance filtration performance without increasing pressure drop. Testing under ASHRAE Standard 52.2 shows MERV 9 filtration with pressure drop equivalent to uncoated filters at standard and high airflow, aiming to support air quality without extra energy demand.

What commercialization pathways is Zentek (ZTEK) pursuing for ZenGUARD™ in Canada?

Zentek outlines four Canadian commercialization pathways: direct purchase orders from end users, potential federal procurement via Innovative Solutions Canada’s Pathway to Commercialization, licensing ZenGUARD™ to HVAC filter supply-chain participants, and selling ZenGUARD™-coated filter media to filter manufacturers as a separate product offering.

Is Zentek’s (ZTEK) ZenGUARD™ technology protected by patents and how long do they last?

Yes. ZenGUARD™ is covered by an issued Canadian patent granted in 2022. The patent protects its application to personal protective equipment and HVAC uses, with a stated term extending to 2041, giving Zentek long-dated intellectual property protection within Canada for this platform.

Why does Zentek (ZTEK) emphasize energy use in commercial and institutional buildings?

The company notes publicly available data showing commercial and institutional buildings account for about 13% of Canada’s total secondary energy use, with HVAC and ventilation systems being the largest internal energy load. ZenGUARD™ aims to improve indoor air quality without raising pressure drop, helping avoid additional HVAC energy consumption.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 6-K: How Foreign Companies Report to the SEC →

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

OF THE SECURITIES EXCHANGE ACT OF 1934

For the month of May 2026

Commission File Number: 001-41310

ZENTEK LTD.

(Registrant)

1123 York Road in

Guelph, Ontario N1G 5G5 Canada

(Address of Principal Executive Offices)

Indicate by check mark whether the Registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F  ☐            Form 40-F  ☒

Indicate by check mark if the Registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):  ☐

Indicate by check mark if the Registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):  ☐

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	ZENTEK LTD.
	(Registrant)
Date: May 6, 2026	By	/s/ Wendy Ford
		Wendy Ford
		Chief Financial Officer

EXHIBIT INDEX

Exhibit	Description of Exhibit
99.1	Press Release dated May 6, 2026 - Zentek Accepting Canadian Commercial Orders for ZenGUARD™ Enhanced Air Filters Following Health Canada Regulatory Classification

Zentek Accepting Canadian Commercial Orders for
ZenGUARD™ Enhanced Air Filters Following Health Canada
Regulatory Classification

ZenGUARD™ Enhanced Air Filters leverage patented graphene-enhanced media tested in accordance with ASHRAE Standard 52.2, engineered to enhance filtration without increased pressure drop, energy consumption and carbon emissions

Guelph, ON - May 6, 2026 -  Further to its press release dated February 17, 2026, Zentek Ltd. (TSX-V: ZEN) (Nasdaq: ZTEK) ("Zentek" or the "Company") is pleased to announce that it has received a revised classification by Health Canada's Pesticides Regulatory Directorate ("PRD") that ZenGUARD™ Enhanced Air Filters are not subject to regulation under the Pest Control Products Act. The product is exempt under section 3(1)(a) of the Pest Control Products Regulations on the basis that it operates through a mechanical mode of action. The classification resolves the regulatory matter most recently disclosed in the Company's press release and Management's Discussion and Analysis dated February 17, 2026. The classification is conditional, and any change to the design, use instruction, or marketing of the product could result in a re-assessment by Health Canada.

Based on the classification by Health Canada, Zentek is now accepting commercial orders for ZenGUARD™ Enhanced Air Filters in Canada and is seeking to advance additional commercialization pathways, including licensing and the sale of ZenGUARD™-enhanced filter media to participants in the heating, ventilation, and air conditioning ("HVAC") supply chain. ZenGUARD™ is the subject of an issued Canadian patent (granted 2022; term to 2041) covering its application to personal protective equipment and HVAC applications.

A Differentiated Approach to Enhanced Indoor Air

Conventional approaches to enhanced indoor air typically rely on denser filter media or increased outdoor air exchange. Both impose a meaningful energy cost on the building: denser media increases pressure drop and fan power; greater outdoor air exchange increases heating, cooling, and dehumidification load. In commercial and institutional buildings, HVAC is among the largest single contributors to electrical consumption.

According to publicly available federal data, commercial and institutional buildings account for approximately 13% of Canada's total secondary energy use, with HVAC and ventilation systems representing the largest share of energy consumption within those buildings.^1,2,3,4 As building owners, federal and provincial procurement programs, and institutional portfolios face tightening energy and emissions targets, the practical question is no longer just how to generate more clean energy - it is how to do more with the energy already being used.

ZenGUARD™ is engineered as a coating, not as a single filter product. Applied to filter media using the Company's proprietary graphene-based formulation and process, the coating is designed to add filtration performance to the substrate filter media without an incremental pressure drop penalty. The Company's value proposition is built on the principle that better building performance should not require more energy to achieve.

Commercial Pathways

Zentek is pursuing four parallel pathways to bring ZenGUARD™ Enhanced Air Filters to Canadian customers:

• Direct purchase orders. Zentek is accepting orders from commercial, institutional, healthcare and industrial customers for ZenGUARD™ Enhanced Air Filters.

• Federal procurement. The Company intends to submit final documentation under its Innovative Solutions Canada's Pathway to Commercialization. A successful application could support direct procurement as an exclusive supplier of this type of innovation directly to the Government of Canada.

• Licensing. Zentek is engaging with established participants in the HVAC filter supply chain on potential licensing arrangements for ZenGUARD™.

• Coated filter media. The Company is exploring the sale of ZenGUARD™-enhanced filter media to filter manufacturers as a separate commercial pathway.

"When I came in on December 1, the classification of ZenGUARD™ Enhanced Air Filters was the largest open regulatory question on the product's Canadian pathway. The team's work since then has been to give Health Canada a complete, science-based picture of how this product actually works," said Mohammed (Moe) Jiwan, Chief Executive Officer of Zentek. "With the classification now in hand, our focus turns to commercial execution. The data that matters to HVAC engineers and building operators is already in the record: independently validated under ASHRAE 52.2, MERV 9 filtration with pressure drop equivalent to uncoated filters at both standard and high airflow conditions. The same air, the same fan power, a better filtration outcome. Commercial and institutional buildings represent a real share of national energy use, and HVAC is the largest single load inside those buildings. We believe our product gives building operators a new tool to support indoor air quality goals without increasing energy consumption. We are accepting purchase orders, advancing the Pathway to Commercialization application, and pursuing licensing and coated-media opportunities with established participants in the HVAC supply chain."

About Zentek Ltd.

Zentek Ltd. is a Canadian intellectual property development and commercialization company advancing a portfolio of graphene-enabled and advanced material technologies across clean air, next-generation materials, and critical minerals. The Company's core platforms are Albany Graphite, ZenGUARD™, and Triera. Albany is the Company's principal critical minerals asset and is advancing toward a Preliminary Economic Assessment targeted for completion in Summer 2026.

Forward-Looking Statements

This news release contains forward-looking statements. Since forward-looking statements address future events and conditions, by their very nature they involve inherent risks and uncertainties. Although Zentek believes that the assumptions and factors used in preparing the forward-looking information in this news release are reasonable, undue reliance should not be placed on such information, which only applies as of the date of this news release, and no assurance can be given that such events will occur in the disclosed time frames or at all. Zentek disclaims any intention or obligation to update or revise any forward-looking information, whether as a result of new information, future events or otherwise, other than as required by law.

Neither the TSX Venture Exchange nor its Regulation Services Provider accepts responsibility for the adequacy or accuracy of this release.

References (public)

¹ Natural Resources Canada (NRCan), Office of Energy Efficiency, "Energy Use in Canada: Trends Publications - Total sectors (2020)" (sector shares of Canada's secondary energy use): https://oee.nrcan.gc.ca/publications/statistics/trends/2020/totalsectors.cfm

² Natural Resources Canada (NRCan), Office of Energy Efficiency, "Energy Use in the Commercial/Institutional Sector (2018)" (distribution of commercial/institutional energy use by end use; space heating is the largest share): https://oee.nrcan.gc.ca/publications/statistics/trends/2018/commercial.cfm

³ Natural Resources Canada (NRCan), Office of Energy Efficiency, Energy Efficiency Trends in Canada 1990 to 2013 (commercial/institutional sector secondary energy use shares, 2013): https://natural-resources.canada.ca/maps-tools-publications/publications/energy-efficiency-trends-canada-1990-2013

⁴ Natural Resources Canada (NRCan), Office of Energy Efficiency, Improving Energy Performance in Canada - Report to Parliament Under the Energy Efficiency Act (2006-2007), Chapter 1 (commercial/institutional sector share of secondary energy use, 2005): https://oee.nrcan.gc.ca/publications/statistics/parliament06-07/chapter1.cfm

For more information:
Mohammed (Moe) Jiwan
Chief Executive Officer, Zentek Ltd.
T: 416-709-8876
E: mjiwan2@zentek.com
W: www.zentek.com

Filing Exhibits & Attachments

1 document

Press Releases

• EX-99.1 EXHIBIT 99.1 11.9 KB