Double-Sided Wet Proofing
Hydrophobic treatment is applied to both sides of the carbon-fiber paper to help reduce persistent liquid-water wetting of the porous backing.
01
Product Overview
CP-H300R substrate · Double-sided hydrophobic treatment · Single-sided MPL
DiffuCarb™ CP-H300M is a wet-proofed carbon paper with a microporous layer, produced from the CP-H300R carbon-paper substrate. The carbon-fiber backing is hydrophobically treated on both sides, while one side is coated with a microporous layer for use at the catalyst-layer interface.
Compared with untreated raw carbon paper, CP-H300M is more specifically oriented toward gas-diffusion, water-management and catalyst-interface applications. The hydrophobic treatment helps reduce persistent liquid wetting of the porous backing, while the MPL provides a finer transition between the carbon-paper substrate and the catalyst layer.
≈0.30 mm Total Thickness
CP-H300R Carbon-Paper Substrate
Double-Sided Hydrophobic PTFE Treatment
Single-Sided Microporous Layer (MPL)
02
Technical Parameters
DiffuCarb™ CP-H300M Carbon Paper with Microporous Layer
| Parameter | CP-H300M |
|---|---|
| Material Type | Carbon Fiber Paper |
| Base Substrate | CP-H300R Carbon Paper |
| Thickness | Approx. 0.30 mm |
| Area Density | Not specified |
| PTFE Treatment | Yes, Double-Sided Hydrophobic Treatment |
| Microporous Layer (MPL) | Yes, Single-Sided MPL |
- The supplied CP-H300M data does not specify area density, porosity, through-plane resistivity, air permeability 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.
- Base-substrate information can be accessed through the CP-H300R link in the table above.
03
Product Features
Hydrophobic treatment, interfacial control and porous conductive support
Single-Sided MPL
A microporous layer is applied to one side, creating a finer porous and more uniform transition between the carbon-paper backing and catalyst-layer region.
Approx. 0.30 mm Thickness
Suitable for electrochemical assemblies requiring a medium-thickness porous carbon-paper support. Working thickness after compression depends on assembly pressure and compression ratio.
Carbon-Fiber Paper Substrate
Based on CP-H300R carbon-fiber paper, retaining the porous framework and conductive support characteristics required for gas-diffusion structures.
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-H300R Carbon-Fiber 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-H300M total thickness is approximately 0.30 mm.
Structural Design Highlights
- CP-H300R backing: provides the porous carbon-fiber framework and conductive structural 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 side.
- Approx. 0.30 mm total thickness: provides an additional structural option for laboratory GDL, MEA and gas-diffusion electrode assemblies.
05
Typical Applications
PEM Fuel Cell GDL · Gas Diffusion Electrodes · Electrochemical Research
PEM Fuel Cells
Suitable as a GDL or related gas-diffusion medium between the catalyst layer and flow field, supporting porous transport, conductive support and water management.
Gas Diffusion Electrodes
Can be used as a porous carbon substrate with a single-sided MPL for gas/liquid interface control and gas-diffusion electrode development.
Electrochemical Materials Research
Suitable for catalyst-layer coating, GDL comparison, interface design and electrode-structure screening. Compatibility should be verified for the intended electrolyte and operating potential.
06
Humidity Model Guide
CP-H300M(L) / CP-H300M(H)
CP-H300M(L) · Low Humidity
Model designation for low-humidity operating conditions or comparative GDL studies under lower-humidity environments.
CP-H300M(H) · High Humidity
Model designation for higher-humidity operating conditions or material screening where water management is more prominent.
How to Select
The supplied data does not state the exact PTFE loading, MPL loading or pore-structure difference between the L and H versions. Please provide operating temperature, relative humidity, gas conditions, compression and cell configuration for selection support.
07
Use & Storage Guidance
Helping preserve the MPL surface and carbon-paper structure
1
Identify the MPL Side
Distinguish the MPL-coated side from the carbon-paper backing side before assembly to avoid incorrect orientation.
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. Final orientation depends on cell design.
3
Cutting & Handling
Use clean, sharp cutting tools and avoid repeated folding, strong bending or direct abrasion of the MPL surface.
4
Storage
Store clean, dry and sealed, and avoid contamination by oils, dust or other materials that may affect the treated surfaces.
08
Price & Specifications
DiffuCarb™ CP-H300M Carbon Paper with Microporous Layer
| Product Code | Description | 10×10 cm | 20×20 cm | Lead Time |
|---|---|---|---|---|
| CP-H300M(L) | Wet-Proofed Carbon Paper with MPL - Low Humidity | $20 | $40 | 1 Day |
| CP-H300M(H) | Wet-Proofed Carbon Paper with MPL - High Humidity | $20 | $40 | 1 Day |
- For bulk quantities, please contact us for additional discounts and a formal quotation.
- Reference lead time is 1 day for both CP-H300M(L) and CP-H300M(H); final stock and dispatch timing should be confirmed before ordering.
- SCI Materials Hub is committed to offering competitive pricing and customer service.
09
Frequently Asked Questions
MPL, wet proofing, substrate relationship, assembly and model selection
Q1: What is the difference between CP-H300M and CP-H300R?
CP-H300M is based on CP-H300R carbon paper and adds double-sided hydrophobic treatment
plus a single-sided MPL. CP-H300R is the underlying carbon-paper substrate,
while CP-H300M is more specifically oriented toward GDL and gas-diffusion electrode applications.
Q2: 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.
Q3: What is the main function of the single-sided MPL?
The MPL creates a finer porous and more uniform surface between the carbon-paper backing
and the catalyst-layer region, making it useful as an interfacial transition layer
in GDL and gas-diffusion electrode structures.
Q4: 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.
Q5: How should I choose between CP-H300M(L) and CP-H300M(H)?
L and H are model designations for low-humidity and high-humidity conditions.
The supplied data does not specify the exact PTFE loading, MPL loading or pore-structure difference between them.
Please provide operating humidity, temperature, gas conditions and MEA configuration for selection support.
Q6: Can CP-H300M be cut to custom dimensions?
It can be cut for experimental use. Clean, sharp cutting tools are recommended.
Avoid repeated rubbing, folding or excessive bending of the MPL surface to reduce the risk of surface damage.
Q7: Are area density, porosity, resistivity and air-permeability values available?
These values were not included in the supplied CP-H300M 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
Request a Quote for CP-H300M
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