Volt Carbon Reports Graphene Associated Thermal and EMI Shielding Performance from Dry Separated Natural Graphite Foil
Volt Carbon Reports Graphene Associated
Thermal and EMI Shielding Performance from
Dry Separated Natural Graphite Foil
Calgary, Alberta--(Newsfile Corp. - May 13, 2026) - Volt Carbon Technologies Inc. (TSXV: VCT)
(OTCQB: TORVF) ("Volt" or the "Company") is pleased to announce independent third party testing
results from the University of Waterloo relating to the Company's first expanded graphite foil trials
derived from graphite processed using Volt's dry separation technology.
The testing program evaluated thermal conductivity and electromagnetic interference ("EMI") shielding
performance characteristics of expanded graphite foils produced from Volt processed graphite
materials as part of the Company's ongoing advanced materials development initiatives.
Thermal conductivity testing provided by the University of Waterloo demonstrated average in plane
thermal conductivity values of approximately 219 W/m·K for Volt derived graphite foil at a thickness of
approximately 0.189 mm.
For general reference purposes, published engineering reference sources
such as Engineering Toolbox, including "Thermal Conductivity of Metals and Alloys" and "Aluminum
Thermophysical Properties,"
report thermal conductivity values for stainless steel in the range of
approximately 15 W/m·K, while aluminum is commonly reported near approximately 205 W/m·K
depending on alloy composition and test conditions.
The expanded graphite foil evaluated in these trials exhibited a density of approximately 1.5 g/cm³. For
general reference purposes, aluminum is commonly reported to exhibit density values near
approximately 2.7 g/cm³, while stainless steel is commonly reported in the range of approximately 7.7 to
8.0 g/cm³ depending on alloy composition and processing conditions. Although these density values
may provide general context regarding potential thermal management and shielding design
considerations, material property comparisons between differing material systems may not be directly
comparable due to variations in structure, composition, operating environment and application specific
performance requirements when considered in engineering design applications.
EMI shielding evaluations conducted in the X band frequency range demonstrated total shielding
effectiveness of approximately 42.7 dB for Volt derived graphite foil at a thickness of 0.189 mm. EMI
shielding effectiveness measured in decibels ("dB") represents attenuation of electromagnetic energy.
Volt's results correspond to signal attenuation greater than approximately 99.99%.
Approximate signal attenuation equivalents corresponding to EMI shielding effectiveness are
summarized below for general reference.
Shielding Effectiveness (dB)
Approximate Signal Attenuation
20 dB
99%
30 dB
99.9%
40 dB
99.99%
50 dB
99.999%
Expanded graphite foil is fundamentally composed of highly aligned graphitic and graphene like carbon
layers. Expanded graphite has a reduced number of graphitic layers compared to bulk graphite.
Published literature, including Y. Liu et al., "Graphene Enhanced Flexible Expanded Graphite Film
with High Electric, Thermal Conductivities and EMI Shielding at Low Graphene Content," Carbon,
2018,
has reported expanded graphite and graphene enhanced expanded graphite films exhibiting
thermal conductivity, electrical conductivity and EMI shielding characteristics relevant to conductive
carbon material applications.
The Company believes the thermal conductivity and EMI shielding performance observed in these first
trials support continued evaluation for Volt's dry separated natural graphite for potential use in graphene
related and conductive carbon material applications.
Published scientific literature,
including A.
Kausar, "Graphene Nanocomposites for Electromagnetic Interference Shielding", Journal of
Composites Science, 2023, and X. Li et al., "Revealing Synergistic Relationship of Thermal
Conduction and Electromagnetic Interference Shielding in Graphene Film", Materials Chemistry and
Physics, 2025,
has reported graphene and conductive carbon materials exhibiting strong thermal
conductivity and EMI shielding performance characteristics.
The Company continues to observe from ongoing testing results that preservation of graphite crystallinity
through its dry separation process contributes to downstream conductive, thermal and material
performance enhancements observed in expandable graphite, graphite foil and graphene related
development programs.
These results represent early stage expanded graphite foil development trials. Additional optimization,
densification, scale up and application specific validation work remains ongoing as the Company
continues evaluating potential commercial applications for these materials, including ongoing
discussions and evaluation activities with industry participants under confidentiality agreements.
Volt plans to continue evaluating dry separated graphite materials for applications including expanded
graphite products, thermal management materials, conductive composites and energy storage
technologies. The Company has previously disclosed the addition of equipment supporting batch scale
production and evaluation of expandable graphite and graphene related materials as part of its
downstream development initiatives.
Dr. Aiping Yu, University Research Chair Professor at the University of Waterloo, Fellow of the Canadian
Academy of Engineering and Board Member, has reviewed and approved the contents of this press
release. Dr. Yu is internationally recognized for her work in graphene and advanced nanomaterials, has
authored more than 260 refereed scientific publications and holds multiple patents in the field.
Dr. Aiping Yu commented, "These first expanded graphite foil trials are encouraging because they
demonstrate functional thermal management and EMI shielding characteristics within ranges reported
for certain graphene and conductive carbon material systems. The ability to potentially achieve these
characteristics using scalable natural graphite derived materials represents an interesting area for
continued development and optimization."
About Volt Carbon Technologies
Volt Carbon is a publicly traded carbon science company, with specific interests in energy storage and
green energy creation, with holdings in mining claims in the provinces of Ontario, Quebec, and British
Columbia in Canada. For the latest information on Volt Carbon's properties and news please refer to the
website
www.voltcarbontech.com
.
On behalf of the Board of Directors,
Volt Carbon Technologies Inc.
V-Bond Lee, P. Eng.
CEO, President, Chairman of the Board and Director
Information Contact
:
Email:
Tel: (519) 763-1197
Neither 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.
FORWARD-LOOKING STATEMENTS: This press release contains forward-looking statements, within the meaning of applicable securities
legislation, concerning Volt Carbon's business and affairs. In certain cases, forward-looking statements can be identified by the use of words
such as "plans", "expects" or "does not expect", "intends", "budget", "scheduled", "estimates", "forecasts", "intends", "anticipates" or variations of
such words and phrases or state that certain actions, events or results "may", "could", "would", "might" or "will be taken", "occur" or "be achieved".
Such forward-looking statements include those with respect to: (i) advancement and commercialization of the Company's dry separation
technology; (ii) development and scale up of demonstration and processing facilities; (iii) continued evaluation, development and
commercialization of graphite, graphene related and advanced carbon material products; (iv) the performance characteristics and potential
applications of expandable graphite, graphite foil and related conductive carbon materials; and (v) participation in thermal management,
conductive shielding, energy storage and advanced materials markets.
Forward-looking statements involve significant risks and uncertainties, should not be read as guarantees of future performance or results, and will
not necessarily be accurate indications of whether or not such results will be achieved. A number of factors, including those discussed above,
could cause actual results to differ materially from the results discussed in the forward-looking statements. Any such forward-looking statements
are expressly qualified in their entirety by this cautionary statement.
All of the forward-looking statements made in this press release are qualified by these cautionary statements. Readers are cautioned not to place
undue reliance on such forward-looking statements. Forward-looking information is provided as of the date of this press release, and Volt Carbon
assumes no obligation to update or revise them to reflect new events or circumstances, except as may be required under applicable securities
legislation.
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