Conductive Carbon-Fiber Framework
Based on CP-H450R raw carbon paper, CP-H450M retains a continuous carbon-fiber network for electrically conductive porous support in electrochemical assemblies.
01
Product Overview
CP-H450R substrate · Double-sided hydrophobic treatment · Single-sided MPL
DiffuCarb™ CP-H450M is a hydrophobic carbon paper with a microporous layer, produced from CP-H450R raw carbon paper. The carbon-fiber backing is treated hydrophobically on both sides, while one side is coated with a microporous layer. The resulting material has a total thickness of approximately 0.48 mm.
CP-H450R provides the conductive porous carbon-fiber framework, while the additional hydrophobic treatment and MPL make CP-H450M more suitable for gas-diffusion, water-management and catalyst-interface applications. Its relatively thick backing can also provide additional structural support and compression tolerance in laboratory GDL, MEA and gas-diffusion-electrode assemblies.
≈0.48 mm Total Thickness
245–255 g/cm² Area Density
Double-Sided Hydrophobic PTFE Treatment
Single-Sided Microporous Layer (MPL)
02
Technical Parameters
DiffuCarb™ CP-H450M Carbon Paper with Microporous Layer
| Parameter | CP-H450M |
|---|---|
| Material Type | Carbon Fiber Paper |
| Base Substrate | CP-H450R Raw Carbon Paper |
| Thickness | Approx. 0.48 mm |
| Area Density | 245–255 g/cm² |
| PTFE Treatment | Yes, Double-Sided Hydrophobic Treatment |
| Microporous Layer (MPL) | Yes, Single-Sided Microporous Layer |
- The area-density value “245–255 g/cm²” is retained exactly according to the supplied specification. Please verify the unit before final publication if needed.
- The supplied CP-H450M data does not specify porosity, through-plane resistivity, air permeability, PTFE loading or MPL loading, so no estimated values have been added.
- For a specific MEA, compression ratio, humidity condition or flow-field design, compatibility should be verified under the intended operating conditions.
03
Product Features
Conductive backing · Double-sided wet proofing · Single-sided MPL · Thick structural support
Double-Sided Hydrophobic Treatment
Both sides of the carbon-fiber backing are hydrophobically treated to help reduce persistent liquid-water wetting of the porous structure.
Single-Sided Microporous Layer
A microporous layer is applied to one side, creating a finer and more uniform interface between the carbon-fiber backing and the adjacent catalyst layer.
Approx. 0.48 mm Thickness
The relatively thick backing provides additional structural support and porous transport space for assemblies where a thicker GDL substrate is preferred.
04
Structure & Surface Treatment
Single-Sided MPL + Double-Sided Hydrophobic Treatment
Single-Sided Microporous Layer (MPL)
Finer Catalyst-Side Interface
Finer Catalyst-Side Interface
CP-H450R Raw Carbon-Paper Backing
Double-Sided Hydrophobic Treatment
Double-Sided Hydrophobic Treatment
This diagram illustrates the layer relationship only and is not drawn to actual thickness scale.
CP-H450M total thickness is approximately 0.48 mm.
Structural Design Highlights
- CP-H450R backing: provides a relatively thick porous carbon-fiber framework for conduction and mechanical support.
- Double-sided hydrophobic treatment: helps reduce persistent liquid wetting and supports retention of gas-transport pathways.
- Single-sided MPL: creates a finer porous surface, typically positioned toward the catalyst-layer or MEA side.
- Approx. 0.48 mm total thickness: suitable for laboratory assemblies requiring a thicker GDL or additional compression support.
05
Typical Applications
PEM Fuel Cell GDL · Gas Diffusion Electrodes · Electrochemical Research
PEM Fuel Cells
Suitable as a relatively thick GDL or related gas-diffusion medium between the catalyst layer and flow field, supporting conductive transport, porous gas diffusion and water-management functions.
Gas Diffusion Electrodes
Can be used as a porous carbon substrate with a single-sided MPL where additional backing thickness, structural support or gas/liquid interface control is required.
Electrochemical Materials Research
Suitable for catalyst-layer coating, GDL comparison, interface design, compression studies and electrode-structure screening. Compatibility should be verified for the intended electrolyte and operating potential.
06
Model & Selection Guide
CP-H450M · Single-model hydrophobic MPL carbon paper
CP-H450M
Approx. 0.48 mm hydrophobic carbon paper based on CP-H450R, with double-sided hydrophobic treatment and a single-sided MPL.
For Thicker GDL Structures
A candidate when the assembly requires greater backing thickness, additional compression support or more porous transport volume.
Selection Information
For model suitability, consider cell chemistry, operating temperature, humidity, flow-field geometry, gasket thickness, compression and target GDL thickness.
07
Use & Storage Guidance
Protect the MPL surface and control compression of the thicker carbon-paper backing
1
Identify the MPL Side
Distinguish the MPL-coated side from the raw carbon-paper backing side before assembly.
2
Typical Assembly Orientation
In common PEM fuel-cell GDL assemblies, the MPL side typically faces the catalyst layer or MEA, while the carbon-paper backing faces the flow field.
3
Control Compression
At approx. 0.48 mm thickness, gasket thickness, flow-field depth and compression ratio should be considered to avoid excessive compression of the porous structure.
4
Cutting & Storage
Use clean, sharp cutting tools and store the material clean, dry and sealed. Avoid oils, dust and aggressive abrasion of the MPL surface.
08
Price & Specifications
DiffuCarb™ CP-H450M Carbon Paper with Microporous Layer
| Product Code | Description | 5×5 cm | 10×10 cm | 20×20 cm | 30×30 cm | Lead Time |
|---|---|---|---|---|---|---|
| CP-H450M | Carbon Paper with Microporous Layer | $20 | $60 | $200 | $400 | 1 Day |
- For bulk quantities, please contact us for additional discounts and a formal quotation.
- Reference lead time is 1 day. Final stock quantity and dispatch timing should be confirmed before ordering.
- SCI Materials Hub is committed to offering competitive pricing and customer service.
09
Frequently Asked Questions
Substrate relationship, MPL, wet proofing, thickness and assembly
Q1: What is the difference between CP-H450M and CP-H450R?
CP-H450M is produced from CP-H450R raw carbon paper
and adds double-sided hydrophobic treatment plus a single-sided MPL.
CP-H450R is the raw carbon-paper substrate, while CP-H450M is more specifically oriented toward
GDL and gas-diffusion-electrode applications.
Q2: Why use a relatively thick 0.48 mm carbon-paper backing?
The thicker backing can provide additional structural support and porous transport volume
in assemblies that require a thicker GDL or greater compression tolerance.
Suitability depends on the flow-field depth, gasket design and target compression ratio.
Q3: Why is double-sided hydrophobic treatment used?
The hydrophobic treatment helps reduce persistent liquid-water wetting of the porous carbon-fiber backing,
supporting retention of gas-transport pathways. Actual behavior also depends on temperature,
humidity, gas flow, compression and cell design.
Q4: What is the purpose of the single-sided MPL?
The MPL creates a finer porous and more uniform interface between the carbon-fiber backing
and the catalyst-layer region, making it useful as an interfacial transition layer in GDL structures.
Q5: Which side should face the catalyst layer?
In common PEM fuel-cell GDL assemblies, the MPL-coated side typically faces the catalyst layer or MEA,
while the carbon-paper backing faces the flow field. Final orientation should follow the specific cell design.
Q6: What should be considered when assembling a 0.48 mm carbon paper?
Gasket thickness, flow-field depth and target compression ratio should be considered.
Excessive compression may alter the pore structure and transport pathways of the carbon-fiber backing.
Q7: Are porosity, resistivity and air-permeability values available?
These values were not included in the supplied CP-H450M specification,
so no estimated data has been added to this page.
If additional test data becomes available, it can be incorporated into the technical-parameter table.
10
International Orders & Shipping
SCI Materials Hub · Worldwide Supply
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