Graphite Felt Electrodes

Price range: 35.00 € through 200.00 €

Precision-cut graphite felt electrodes for electrochemistry R&D.

Activated graphite felt (G series). Cut to fit Redox-Flow A-, S-, M-, X- and Y-cells, or supplied as 19.5 × 29.5 cm sheets.
Used in redox flow batteries, PEM and AEM water electrolysis, CO₂ electrolysis, fuel cells, electrosynthesis and capacitive de-ionisation.
Shipped from EU stock – no customs or import VAT handling for EU customers.

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About the product

AvCarb®

AvCarb® Material Solutions (Lowell, MA, USA) is one of the leading manufacturers of carbon-based electrode materials for electrochemical systems. Redox-Flow stocks a curated range of AvCarb carbon papers, gas diffusion layers and graphite felts in Denmark and cuts them to the size you need – so you get the right material in the right size within days, without customs paperwork or minimum order quantities.

Every piece is cut with precision tooling from certified AvCarb sheets and rolls. The standard sizes match our cell platforms: 2.5 × 2.5 cm and 5.0 × 5.0 cm fit the active area of the A-cell, S-cell, M-cell and X-cell, and 19.5 × 29.5 cm sheets serve larger cells, stacks and your own cutting. Other sizes and shapes – 10 × 10 cm, 40 × 40 cm, discs, inserts for 100 cm² cells, with or without holes – are available on request through the inquiry form below.

Which material for which application?

Application	Recommended material	Why
Vanadium and other aqueous redox flow batteries – felt electrode in a flow-through cell	G280A (2.8 mm) or G475A (4.5 mm) activated graphite felt	Activated by AvCarb for wettability and active surface sites, with lot-certified electrochemical performance. The standard felt electrode in our flow-battery cell kits.
Flow batteries with thin electrodes or flow-field current collectors (zero-gap designs)	MGL370, MGL1500, MGL2000, MGL2400 carbon paper	Rigid molded graphite laminates from 0.37 to 2.4 mm with 68–78 % porosity. The thick grades fill a 1–3 mm compartment with a single piece and keep their thickness under compression.
PEM water electrolysis – cathode porous transport layer (PTL)	MGL190, MGL370	Low-cost alternative to titanium on the cathode side; the rigid laminate can replace a separate flow field.
AEM water electrolysis, CO₂ and CO electrolysis, electro-organic synthesis – gas diffusion electrode substrate	GDS2185, GDS3250, MB-30	PTFE-treated carbon paper with a microporous layer on one side for gas-fed electrodes. Choose by thickness and diffusivity. MGL190 and MGL370 are the untreated, hydrophilic alternatives.
PEM and direct-methanol fuel cells	GDS2185 (dry or self-humidified systems), GDS3250 (medium diffusivity), MB-30 (high diffusivity, high current density)	AvCarb’s gas diffusion systems are developed for fuel cell stacks; the three grades cover the humidity and current-density range.
Supercapacitors, capacitive deionisation, bio-electrochemical systems, electrochemical sensors	G280A, G475A felt; MGL carbon paper	High surface area (felt) or defined porosity and low resistance (paper) at low cost.

Activated graphite felt – G series

Needle-punched PAN felt, heat-treated to graphite and then activated by AvCarb to promote wettability and increase the number of active surface sites. Every lot is certified for electrochemical performance in the wet state. The felt is ready to use – no thermal pre-treatment is needed on your side.

AvCarb G280A – 2.8 mm nominal thickness (uncompressed), 207 g/m², 0.075 g/cm³. Our standard felt for 2.5 × 2.5 cm and 5 × 5 cm flow cells with 2–3 mm compartments.

AvCarb G475A – 4.5 mm nominal thickness (uncompressed), 448 g/m², 0.10 g/cm³. For deeper compartments or higher compression ratios.

Sizes and packaging

2.5 × 2.5 cm – active area of the A-cell, S-cell and M-cell and of the X-cell with the matching gasket.
5.0 × 5.0 cm – active area of the X-cell and X-stack.
19.5 × 29.5 cm sheet – for larger cells, stacks and cutting your own pieces.
Packages of 1, 2 or 8 pieces (sheets: 1 or 2).
Custom sizes and shapes on request – usually shipped within a few working days from stock.
Felt is supplied uncompressed; design the compartment for a defined compression, see the assembly manual of your cell.
GDS pieces: handle by the edges and keep the MPL surface clean.

Why buy AvCarb from Redox-Flow

In stock in Denmark – delivery in 1–3 working days inside the EU, no customs and no import VAT handling.
Precision cut to your cell – no waste and no hand-cutting of expensive sheets.
Same materials, grades and activation as in our cell kits and assembly manuals, so your results transfer directly.
Support from an electrochemistry team: tell us the chemistry and the cell, and we recommend the grade, the size and the compression.

Nominal values from the AvCarb technical datasheets (MGL datasheet V1.1, 2025; GDS2185 TDS Rev. 2, 2026; G280 and G475 TDS, September 2026). GDS3250 and MB-30 values are from AvCarb’s gas diffusion systems technical data as published by AvCarb’s distributors. Nominal values, not specifications.

Activated graphite felt

Grade	Nominal thickness (1.7 kPa)	Areal weight	Bulk density	Through-plane resistance (43 kPa)	Oxidation rate	Treatment
G280A	2.8 mm	207 g/m²	0.075 g/cm³	107 mΩ·cm²	0.46 %/h	Activated by AvCarb, lot-certified wet performance
G475A	4.5 mm	448 g/m²	0.10 g/cm³	88 mΩ·cm²	0.38 %/h	Activated by AvCarb, lot-certified wet performance

Carbon paper – MGL

Grade	Thickness, uncompressed	Thickness at 1 MPa / 3 MPa	Bulk density	Porosity	Through-plane resistivity at 1 MPa / 3 MPa	Gas permeability (Gurley)	PTFE / MPL
MGL190	195 µm	165 / 110 µm	0.45 g/cm³	78 %	6.0 / 3.1 mΩ·cm²	1.0 s	none / none
MGL370	375 µm	320 / 210 µm	0.43 g/cm³	78 %	7.8 / 4.6 mΩ·cm²	1.4 s	none / none
MGL1500	1,500 µm	1,400 / 1,200 µm	0.72 g/cm³	71 %	13.8 / 10.7 mΩ·cm²	1.7 s	none / none
MGL2000	2,000 µm	1,900 / 1,600 µm	0.72 g/cm³	70 %	14.1 / 11.0 mΩ·cm²	1.8 s	none / none
MGL2400	2,400 µm	2,250 / 1,900 µm	0.72 g/cm³	68 %	14.5 / 11.1 mΩ·cm²	2.0 s	none / none

Gas diffusion layers with MPL – GDS

Grade	Base paper	Thickness at 5 N/cm²	Thickness at 1 MPa	Areal weight	Bulk density	Through-plane resistance at 1 MPa	Relative diffusivity (D/D₀)	PTFE	MPL
GDS2185	P75	269 µm	221 µm	155 g/m²	0.58 g/cm³	≤ 33 mΩ·cm²	0.03	yes	one side, smooth
GDS3250	EP40	225 µm	173 µm	75 g/m²	0.32 g/cm³	< 14 mΩ·cm²	0.30	yes	one side
MB-30	EP40	205 µm	150 µm	55 g/m²	0.27 g/cm³	< 12 mΩ·cm²	0.33	yes	one side

Cut sizes

Size	Area	Fits
2.5 × 2.5 cm	6.25 cm²	A-cell, S-cell, M-cell, X-cell (with matching gasket)
5.0 × 5.0 cm	25 cm²	X-cell, X-stack
19.5 × 29.5 cm	575 cm²	Larger cells, stacks, own cutting
Custom	on request	10 × 10 cm, 40 × 40 cm, discs, 100 cm² inserts, with or without holes

AvCarb datasheets

Support & Inquiry

Do you have specific questions or would you like help in selection and configuration of our product:

Graphite Felt Electrodes

You are very welcome to contact us in the form here. We are ready to support you in selecting the best solutions for your R&D.

Always include as much information as you can about your project, what type of chemistry you are planning to use, what is the purpose of the equipment you are interested in. That will make it much easier for us to guide you towards the best solution for your project.