Zentek ships first filters under CAD $349K maximum offer

The standing offer runs through August 18, 2027, but call-ups depend on requirements and there is no minimum purchase volume.

Rhea-AI Filing Summary

Zentek Ltd. (ZTEKF) announced that it shipped its first order of ZenGUARD™ Enhanced Air Filters to a federal facility under a Government of Canada standing offer. The offer covers HVAC filtration products for federal facilities in the National Capital Region through August 18, 2027, and has a maximum published value of CAD $348,666.84. Call-ups are issued as requirements arise; the offer guarantees no revenue and sets no minimum orders or purchase volume.

National Research Council of Canada testing reported nearly fivefold improvement in aerosol filtration versus an untreated filter, with no impact on airflow or increase in pressure drop. In a three-month school pilot, fan energy was estimated to be 22% lower than with the standard MERV 13 filters replaced. Zentek says results vary by building, climate and HVAC system, and that references to federal policies do not imply government endorsement.

Key Figures

Maximum published value: CAD $348,666.84 Aerosol filtration improvement: Nearly fivefold Estimated fan energy reduction: 22% +1 more

4 metrics

Maximum published value CAD $348,666.84 Government of Canada standing offer for HVAC filtration products

Aerosol filtration improvement Nearly fivefold National Research Council of Canada testing versus an untreated filter

Estimated fan energy reduction 22% Three-month school pilot versus the standard MERV 13 filters replaced

Pilot duration Three months School pilot with the Grand Erie District School Board

Key Terms

standing offer, call-ups, MERV 13, pressure drop, +1 more

5 terms

standing offer regulatory

"under the Government of Canada standing offer"

Standing offer is a pre-arranged agreement in which a buyer (often a government or large organization) and a supplier agree on prices, delivery terms, and conditions for goods or services to be supplied over a set period, while actual orders are placed later as needs arise and no specific quantity is guaranteed. For investors, it signals an approved, on-call sales channel and potential recurring work—like a store keeping a vendor on speed dial to restock—providing visibility into future demand without promising firm revenue.

call-ups regulatory

"Call-ups are issued as requirements arise."

MERV 13 technical

"standard MERV 13 filters"

MERV 13 is a common rating for air filters that measures how well the filter captures tiny particles such as dust, pollen, smoke and some respiratory droplets—think of it as a finer kitchen strainer that traps much smaller crumbs. For investors, MERV 13 matters because upgrading or maintaining these filters affects building operating costs, tenant health and comfort, regulatory compliance and capital spending, all of which can influence property value, occupancy and liability risk.

pressure drop technical

"no increase in pressure drop"

Scope 1 and Scope 2 GHG emissions regulatory

"reduce absolute Scope 1 and Scope 2 GHG emissions"

FAQ

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

What is the maximum value of ZTEKF’s Government of Canada filter offer?

The standing offer has a maximum published value of CAD $348,666.84. It covers HVAC filtration products for federal facilities in the National Capital Region, with call-ups issued as requirements arise; it sets no minimum order or purchase volume and is not a guarantee of revenue.

How did ZTEKF’s ZenGUARD filters perform in testing and the school pilot?

National Research Council of Canada testing reported nearly fivefold improvement in aerosol filtration versus an untreated filter, with no impact on airflow or increase in pressure drop. In a three-month school pilot, fan energy was estimated to be 22% lower than with the standard MERV 13 filters replaced.

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

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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
UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of October 2026

Commission File Number: 001-41310

ZENTEK LTD.
(Translation of registrant's name into English)

1123 York Road
Guelph, Ontario N1E 6Z1 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 ☒

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: October 1, 2026	By	/s/ Wendy Ford
		Wendy Ford
		Chief Financial Officer

EXHIBIT INDEX

Exhibit		Description
99.1		News Release dated October 1, 2026 - Zentek Ships First Government of Canada Order of ZenGUARD™ Enhanced Air Filters

Zentek Ships First Government of Canada Order of ZenGUARD™ Enhanced Air Filters

Filters designed to improve air filtration without the added fan energy,
in line with federal energy efficiency and net-zero commitments¹

• Nearly fivefold improvement in aerosol filtration versus an untreated filter in National Research Council of Canada testing, without an increase in pressure drop¹

• Estimated 22% lower fan energy than the standard MERV 13 filters replaced in a three-month school pilot²

• Supports the Greening Government Strategy commitment that federal operations will be net-zero emissions by 2050³

Guelph, ON - October 1, 2026 - Zentek Ltd. ("Zentek" or the "Company") (TSXV: ZEN) (OTCQX: ZTEKF) today announced that it has shipped its first order of ZenGUARD™ Enhanced Air Filters to a federal facility under the Government of Canada standing offer announced on August 20, 2026.⁴

The standing offer covers HVAC filtration products for federal facilities in the National Capital Region, runs to August 18, 2027, and has a maximum published value of CAD $348,666.84. Call-ups are issued as requirements arise. The standing offer is not a guarantee of revenue and sets no minimum number of orders or purchase volume.

Federal Energy Efficiency Policy Context

The Greening Government Strategy states that federal operations "will be net-zero emissions by 2050" and commits departments to "reduce absolute Scope 1 and Scope 2 GHG emissions by 40% by 2025 and by at least 90% below 2005 levels by 2050."³ The Canada Green Buildings Strategy notes that "Buildings account for 18% of Canada's emissions, when including electricity-related emissions."⁵

Natural Resources Canada's Report to Parliament under the Energy Efficiency Act states: "Improving energy efficiency is central to this effort. It reduces costs for households, strengthens business competitiveness, creates good jobs and lowers emissions."⁶

Cleaner Air Without the Energy Penalty

Better aerosol filtration has usually meant a denser filter, such as a standard MERV 13 filter, which raises pressure drop and makes HVAC fans use more energy. ZenGUARD™ Enhanced Air Filters are designed to avoid that trade-off and slot into existing HVAC systems with no modifications.¹ In National Research Council of Canada testing, ZenGUARD™ technology improved the aerosol filtration efficiency of an untreated filter by almost five times, with no impact on airflow and no increase in pressure drop.¹ In a three-month pilot at McKinnon Park Secondary School with the Grand Erie District School Board, the filters reduced fan energy by an estimated 22% compared to the standard MERV 13 filters they replaced.²

The Company believes these results are consistent with the federal energy efficiency and emissions objectives described above. Results will vary by building, climate and HVAC system. References to federal policies are for context only and do not imply endorsement by the Government of Canada.

ZenGUARD™ Enhanced Air Filters are also on the Innovative Solutions Canada Pathway to Commercialization source list, which allows federal departments and agencies to purchase them directly. Inclusion does not guarantee any orders.⁴

Management Commentary

"This shipment takes ZenGUARD™ Enhanced Air Filters from a standing offer into a federal facility. The federal government has committed to net-zero operations by 2050, and filters that draw less fan energy fit that direction. We are ready to help lower filtration and energy costs wherever the federal service sees the opportunity." - Mohammed (Moe) Jiwan, Chief Executive Officer, Zentek.

About Zentek

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. Core platforms are Albany Graphite, ZenGUARD™, and Triera. Albany is the Company's principal critical minerals asset.

For more information:

Mohammed (Moe) Jiwan

Chief Executive Officer, Zentek Ltd.

T: 437-826-3779

E: mjiwan2@zentek.com

www.zentek.com

Forward-Looking Statements

This news release contains forward-looking statements, including statements regarding future orders, the energy, emissions and cost savings federal facilities may achieve with ZenGUARD™ Enhanced Air Filters, and the consistency of those products with federal policy objectives. Forward-looking statements involve inherent risks and uncertainties, including that federal departments may not issue further call-ups and that performance in other buildings may differ from the testing and pilot results described. Although Zentek believes the assumptions used in preparing this information are reasonable, undue reliance should not be placed on it, and no assurance can be given that such events will occur in the disclosed time frames or at all. Zentek disclaims any obligation to update or revise any forward-looking information, other than as required by law.

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

References (public)

¹ Innovation, Science and Economic Development Canada, "Helping Canadians breathe easy with Zentek." https://ised-isde.canada.ca/site/innovative-solutions-canada/en/our-stories/helping-canadians-breathe-easy-zentek

² D. Sridhar, K. Owen, F. Mesicek, R. Shacklock, C. van der Kuur, Energy-Efficient Solutions for Improving Indoor Air Quality and Reducing Carbon Emissions in a Canadian School: The Role of Silver-Graphene Oxide Treated HVAC Air Filters, AVIC ASHRAE IEQ (2025). Fan energy savings are calculated from ASHRAE 52.2 test-rig pressure-drop data.

³ Treasury Board of Canada Secretariat, Greening Government Strategy: A Government of Canada Directive (page modified May 25, 2026). https://www.canada.ca/en/treasury-board-secretariat/services/innovation/greening-government/strategy.html

⁴ Zentek Ltd. news releases: "Zentek Awarded Government of Canada Standing Offer for HVAC Filters" (August 20, 2026), https://zentek.com/news/2026-08-20-zentek-awarded-government-of-canada-standing-offer-for-hvac-filters; "Zentek Provides Corporate Update" (September 14, 2026), https://www.newsfilecorp.com/release/314081/Zentek-Provides-Corporate-Update

⁵ Natural Resources Canada, The Canada Green Buildings Strategy: Transforming Canada's buildings sector for a net-zero and resilient future (July 2024). https://natural-resources.canada.ca/energy-efficiency/building-energy-efficiency/canada-green-buildings-strategy-transforming-canada-s-buildings-sector-net-zero-resilient-future

⁶ Natural Resources Canada, Energy Efficiency: An essential part of Canada's net-zero future. Report to Parliament under the Energy Efficiency Act 2022-2023. https://natural-resources.canada.ca/sites/admin/files/documents/2025-08/nc368-report-parliament-energy-efficiency-2022-23-jun-2024-25-eng.pdf

Filing Exhibits & Attachments

1 document

Press Releases

• EX-99.1 EXHIBIT 99.1 11.6 KB