Zentek graphite reaches 99.99985% bench-scale purity

The reported Albany material has not been irradiated or characterized against reference grades, and Zentek makes no nuclear qualification claim.

Rhea-AI Filing Summary

Zentek Ltd. said Chief Executive Officer Mohammed (Moe) Jiwan was invited to present Albany Graphite Project results at INGSM-26; the conference’s tentative program schedules the presentation for October 22, 2026, in Osaka, Japan. The company reported bench-scale purification results reaching 99.99985 wt.% carbon (5N+) without hydrofluoric acid and an average of 99.9995 wt.% carbon across three samples. Zentek says the material has not been irradiated or characterized against reference grades and makes no qualification claim.

The presentation will ask specialists to advise on a target specification and application and on appropriate characterization support. Zentek’s preliminary economic assessment models Albany 5N product at US$50,000 per tonne, using nuclear-grade synthetic graphite as the closest observable price analogue. The assessment includes Inferred mineral resources considered too speculative geologically to be categorized as mineral reserves, and Zentek says there is no certainty it will be realized. Qualification has not been achieved; the company’s stated objectives are to complete a pre-feasibility study and pursue qualification for nuclear applications.

Filing Explained

The release cites X-energy’s graphite agreements with Toyo Tanso and SGL Carbon as market examples, but says neither is a Zentek customer and that no supply agreement or customer qualification exists; those agreements are not disclosed sales or qualification for Albany.

Key Figures

Maximum measured purity: 99.99985 wt.% carbon Average purity: 99.9995 wt.% carbon Earlier bench-scale purity: 99.9992 wt.% carbon +4 more

7 metrics

Maximum measured purity 99.99985 wt.% carbon Bench-scale result; identified as 5N+

Average purity 99.9995 wt.% carbon Across three bench-scale samples

Earlier bench-scale purity 99.9992 wt.% carbon Reported with an equivalent boron content of 2.60 ppm

Equivalent boron content 2.60 ppm Reported with bench-scale purity of 99.9992 wt.% carbon

PEA modeled price US$50,000 per tonne Albany 5N product

Projected global nuclear capacity 377 GW to between 561 GW and 992 GW IAEA 2025 projections for 2050

Scheduled presentation date October 22, 2026 INGSM-26 tentative program

Key Terms

5N+, equivalent boron content, fluidized bed reactor, preliminary economic assessment, +2 more

6 terms

5N+ technical

"maximum measured purity of 99.99985 wt.% carbon (5N+)"

equivalent boron content technical

"with an equivalent boron content of 2.60 ppm"

fluidized bed reactor technical

"in a fluidized bed reactor"

A fluidized bed reactor is an industrial vessel where solid particles are suspended and mixed by a rising stream of gas or liquid so they behave like a boiling fluid, allowing fast and even heat transfer and reaction. For investors, its use can mean higher production throughput, more consistent product quality, lower energy or catalyst costs, and potentially fewer emissions or safety issues compared with fixed-bed equipment, all of which affect operating margins and capital needs.

preliminary economic assessment financial

"The Company’s preliminary economic assessment"

A preliminary economic assessment is an initial analysis that estimates the potential profitability and feasibility of a project or resource, such as a new mineral deposit or development venture. It provides a rough idea of costs, benefits, and risks, helping investors decide whether to pursue more detailed studies. This early evaluation is important because it offers a snapshot of whether the project is worth further investment and development.

Inferred mineral resources technical

"includes Inferred mineral resources that are considered too speculative geologically"

An inferred mineral resource is an estimate of the quantity and grade of minerals in the ground based on limited sampling and geological information, where confidence is low and continuity is uncertain. For investors it signals potential value but also higher risk—like a rough sketch of a hidden treasure that requires much more exploration and testing before you can reliably judge its size or economic worth.

Qualified Person regulatory

"a “Qualified Person” under National Instrument 43-101"

A qualified person is someone with specialized knowledge, experience, and training in a particular field, allowing them to accurately assess and verify information or work. Their expertise helps ensure that reports, evaluations, or decisions are trustworthy and meet required standards. For investors, a qualified person provides confidence that the information they rely on is credible and properly validated.

FAQ

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

How pure is Zentek (ZTEKF) Albany graphite?

Zentek reported a maximum measured purity of 99.99985 wt.% carbon (5N+) and an average of 99.9995 wt.% carbon across three bench-scale samples. The material has not been irradiated or characterized against reference grades, and the company makes no qualification claim.

What price does Zentek’s PEA use for Albany 5N graphite?

The PEA models Albany’s 5N product at US$50,000 per tonne, using nuclear-grade synthetic graphite as the closest observable price analogue. It is preliminary, includes Inferred mineral resources considered too speculative geologically to be categorized as mineral reserves, and has no certainty of realization.

Has Zentek (ZTEKF) qualified Albany graphite for nuclear applications?

No. Zentek states that qualification has not been achieved. The material has not been irradiated or characterized against reference grades, and the company makes no qualification claim.

When and where is Zentek presenting its Albany graphite results?

The conference’s tentative program schedules the presentation for October 22, 2026, in Osaka, Japan. INGSM-26 is co-organized by Toyo Tanso Co., Ltd. and the Japan Atomic Energy Agency and is being held at Grand Front Osaka.

Does Zentek have a supply agreement with the companies mentioned in its announcement?

Zentek states that the companies named are referenced for their own public activities only. None is a Zentek customer, and no supply agreement or customer qualification exists with any of them.

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

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Available on EDGAR 10/07/2026 - 09:42 AM Accepted by SEC EDGAR 10/07/2026 - 09:41 AM Learn about SEC filing dates

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 7, 2026	By	/s/ Wendy Ford
		Wendy Ford
		Chief Financial Officer

EXHIBIT INDEX

Exhibit		Description
99.1		Press Release dated October 5, 2026 - Zentek Invited to Present Albany Graphite Purification Results at the 26th International Nuclear Graphite Specialists Meeting

Zentek Invited to Present Albany Graphite Purification
Results at the 26th International Nuclear Graphite Specialists
Meeting

Presentation on acid-free purification of Albany graphite to 5N at bench scale scheduled
for October 22, 2026, in Osaka, Japan

• INGSM-26 is co-organized by Toyo Tanso and the Japan Atomic Energy Agency

• The presentation will set out Albany's bench-scale results and ask the specialist community what specification the material should be aimed at

• The International Atomic Energy Agency projects global nuclear capacity could grow from 377 GW to between 561 GW and 992 GW by 2050

Guelph, ON - October 5, 2026 - Zentek Ltd. ("Zentek" or the "Company") (TSXV: ZEN) (OTCQX: ZTEKF) today announced that Mohammed (Moe) Jiwan, Chief Executive Officer, has been invited by the organizers of the 26th International Nuclear Graphite Specialists Meeting ("INGSM-26") to present results from the Albany Graphite Project. The presentation, titled "Acid-Free Purification of Albany Breccia-Pipe Graphite to 5N, in Search of a Specification," is scheduled for Thursday, October 22, 2026, in Osaka, Japan, according to the conference's tentative program.

The Presentation

Every nuclear graphite grade qualified for service today is synthetic, and the Company is not presenting Albany as a replacement for those grades. At bench scale, the Company has reported purification of Albany graphite to 99.9992 wt.% carbon with an equivalent boron content of 2.60 ppm, and, in subsequent testing, to a maximum measured purity of 99.99985 wt.% carbon (5N+) without hydrofluoric acid, in a fluidized bed reactor. The material has not been irradiated or characterised against reference grades, and the Company makes no qualification claim. The presentation asks the specialist community two questions: what specification and application the material should be aimed at, and who could assist in its proper characterisation.

The Conference

INGSM-26 runs October 18 to 23 at Grand Front Osaka. According to the conference website, it is co-organized by Toyo Tanso Co., Ltd. and the Japan Atomic Energy Agency, with expected collaboration from the International Atomic Energy Agency ("IAEA"). Other presenters on the tentative program include Oak Ridge and Idaho National Laboratories, the United Kingdom National Nuclear Laboratory, EDF Energy and NRG PALLAS, which is presenting its graphite qualification work for Kairos Power and Terrestrial Energy.

Nuclear Graphite Demand

Nuclear power deployment is accelerating as electricity demand grows, with artificial intelligence and data centres among the drivers. The IAEA's 2025 projections estimate that global nuclear capacity could increase from 377 GW to between 561 GW and 992 GW by 2050. That growth is already turning into long-term commitments for reactor graphite. In November 2025, X-energy announced an agreement to purchase isotropic graphite core components for its first four-unit Xe-100 plant from Toyo Tanso for approximately US$40 million, and in January 2026 SGL Carbon announced a long-term agreement with X-energy with an initial contract value of approximately US$100 million.

Preliminary Economic Assessment

The Company's preliminary economic assessment ("PEA"), prepared by Micon International Limited and announced on August 10, 2026, models Albany's 5N product at US$50,000 per tonne, using nuclear-grade synthetic graphite as the closest observable price analogue. The PEA is preliminary in nature, includes Inferred mineral resources that are considered too speculative geologically to be categorized as mineral reserves, and there is no certainty that it will be realized. The Company's objectives for Albany are to complete a pre-feasibility study and to pursue qualification of Albany graphite for nuclear applications. Qualification has not been achieved, and there is no assurance that it will be.

Mr. Peter Wood, P.Eng., P.Geo., Vice President, Development of Albany Graphite Corp., a "Qualified Person" under National Instrument 43-101, has reviewed and approved the technical information contained in this news release.

Management Commentary

"INGSM brings together the people who make, qualify and use reactor graphite," said Mohammed (Moe) Jiwan, Chief Executive Officer of Zentek. "We know how pure the material is at bench scale. We don't yet know what specification it should be aimed at, and this is the community best placed to tell us. Our focus remains on advancing Albany toward a pre-feasibility study and finding the partners to characterise it properly."

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.

About Albany Graphite Corp.

The Albany Graphite Project is an igneous-hosted, fluid-derived graphite deposit held in two breccia pipes in Northern Ontario, near Hearst, held through the Company's wholly owned subsidiary Albany Graphite Corp. Independent bench-scale testing disclosed on September 22, 2025, confirmed ultra-high purity of 99.9992% with an equivalent boron content of 2.60 ppm, consistent with published benchmarks for potential nuclear-grade applications. Additional results disclosed on September 14, 2026, from the bench-scale purification program that supported the Company's August 10, 2026, PEA demonstrated a range of 4N to 5N graphite products and established the product specifications used in the PEA's product mix and pricing. As part of this program, a halogen-free fluidized bed reactor purification process achieved a maximum measured purity of 99.99985 wt.% carbon and an average purity of 99.9995 wt.% carbon across three bench-scale samples. The Project is being advanced as a potential domestic North American source of critical-grade graphite for nuclear, defence and allied-nation supply chains. Graphite is designated a critical mineral by Canada, the United States and Australia, and is listed as both a critical raw material and a strategic raw material under the European Union's Critical Raw Materials Act.

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. Forward-looking statements in this news release include, without limitation, statements about the market for graphite used in nuclear reactors, demand for nuclear power, the PEA and modelled pricing for 5N graphite, Albany's potential to supply that market, the Company's presentation at INGSM-26, and the Company's intention to pursue qualification of Albany graphite for nuclear applications. Bench-scale results are not necessarily indicative of results at commercial scale. The INGSM-26 program is tentative and subject to change. The companies named in this release are referenced for their own public activities only. None is a customer of Zentek, and no supply agreement or customer qualification exists with any of them. There is no certainty that the market opportunity described will result in a material benefit to the Company. 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 because of new information, future events or otherwise, 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.

Filing Exhibits & Attachments

1 document

Press Releases

• EX-99.1 EXHIBIT 99.1 11.7 KB