Strong Conductive Foundation
Based on CP-H850R raw carbon paper, with supplied through-plane resistivity below 14 mΩ·cm², providing a conductive porous framework for electrochemical assemblies.
01
Product Overview
CP-H850R substrate · Thick conductive backing · Double-sided hydrophobic treatment · Single-sided MPL
DiffuCarb™ CP-H850M is a hydrophobic carbon paper with a microporous layer, produced from CP-H850R raw carbon paper. The base material provides a thick porous carbon-fiber framework with excellent electrical conductivity, while further wet-proofing and MPL processing adapts the substrate for gas-diffusion and catalyst-interface applications.
CP-H850M has a total thickness of 0.88±0.02 mm, making it substantially thicker than many conventional carbon-paper GDL substrates. The additional backing thickness can provide greater structural support, compression tolerance and porous transport volume. Double-sided hydrophobic treatment helps reduce persistent liquid-water wetting of the carbon-fiber backing, while the single-sided MPL creates a finer transition toward the catalyst-layer or MEA side.
0.88±0.02 mm Total Thickness
480–490 g/cm² Area Density
<14 mΩ·cm² Through-Plane Resistivity
Single-Sided MPL Double-Sided Hydrophobic Treatment
02
Technical Parameters
DiffuCarb™ CP-H850M Hydrophobic Carbon Paper with Microporous Layer
| Parameter | CP-H850M |
|---|---|
| Material Type | Carbon Fiber Paper |
| Base Substrate | CP-H850R Raw Carbon Paper |
| Thickness | 0.88±0.02 mm |
| Area Density | 480–490 g/cm² |
| Through-Plane Resistivity | <14 mΩ·cm² |
| Through-Plane Permeability | >0.1 cm S |
| PTFE Treatment | Yes, Double-Sided Hydrophobic Treatment |
| Microporous Layer (MPL) | Yes, Single-Sided Microporous Layer |
- The area-density value “480–490 g/cm²” and through-plane permeability “>0.1 cm S” are retained exactly from the supplied specification. Please verify these units before final publication if required.
- The supplied data does not specify porosity, PTFE loading, MPL loading or compressed thickness, 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
Thick carbon-fiber backing · Strong conductive foundation · Double-sided wet proofing · Single-sided MPL
Double-Sided Hydrophobic Treatment
Both sides of the carbon-fiber backing are hydrophobically treated to help reduce persistent liquid-water wetting and support retention of gas-transport pathways.
Single-Sided Microporous Layer
A microporous layer is applied to one side, creating a finer and more uniform transition between the coarse carbon-fiber network and the catalyst-layer region.
Thick Structural Support
The 0.88 mm-class backing provides substantial thickness, compression tolerance and porous transport volume for applications requiring a thicker GDL structure.
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-H850R Thick 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-H850M total thickness is 0.88±0.02 mm.
Structural Design Highlights
- CP-H850R backing: provides a thick porous carbon-fiber framework, conductive pathway and mechanical support.
- Double-sided hydrophobic treatment: helps reduce persistent liquid wetting and supports gas-channel retention.
- Single-sided MPL: forms a finer pore structure on one side, typically positioned toward the catalyst layer or MEA.
- 0.88 mm-class thickness: suitable for research assemblies requiring a thick GDL, larger compression allowance or stronger support.
05
Typical Applications
Thick GDL · Gas Diffusion Electrodes · Electrochemical Research
PEM Fuel Cells
Can be evaluated as a thick GDL or related gas-diffusion medium, supporting electrical conduction, gas transport, water management and mechanical backing.
Gas Diffusion Electrodes
Suitable as a thick porous carbon substrate with a single-sided MPL where greater backing thickness, porous volume or structural support is required.
Electrochemical Materials Research
Suitable for catalyst-layer coating, GDL comparison, compression studies, interface design and electrode-structure screening. Compatibility should be verified for the intended electrolyte and operating potential.
06
Model & Selection Guide
CP-H850M · Thick hydrophobic carbon paper with single-sided MPL
CP-H850M
0.88±0.02 mm thick hydrophobic carbon paper based on CP-H850R, with double-sided hydrophobic treatment and a single-sided microporous layer.
For Thick GDL Structures
A candidate when the assembly requires greater backing thickness, larger compression allowance or stronger mechanical support.
Before Selection
Consider cell chemistry, operating temperature, humidity, flow-field depth, gasket thickness, compression ratio and target GDL thickness.
07
Use & Storage Guidance
Protect the MPL surface and control compression of the 0.88 mm thick 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 Carefully
At 0.88 mm thickness, gasket thickness, flow-field depth and compression ratio should be coordinated to avoid excessive compression of the porous carbon structure.
4
Cutting & Storage
Use clean, sharp tools and store the material clean, dry and sealed. Avoid oils, dust and aggressive abrasion of the MPL surface.
08
Price & Specifications
DiffuCarb™ CP-H850M Hydrophobic Carbon Paper with Microporous Layer
| Product Code | Description | 5×5 cm | 10×10 cm | 20×20 cm | Lead Time |
|---|---|---|---|---|---|
| CP-H850M | Hydrophobic Carbon Paper with Microporous Layer | $20 | $60 | $200 | Ask for Quote |
- USD prices are converted from the supplied RMB prices using RMB ÷ 5 and rounded up to the next whole US dollar.
- For bulk quantities, please contact us for additional discounts and a formal quotation.
- Stock quantity, dispatch time and custom cutting requirements should be confirmed before ordering.
09
Frequently Asked Questions
Substrate relationship, conductivity, MPL, wet proofing, thickness and assembly
Q1: What is the difference between CP-H850M and CP-H850R?
CP-H850M is produced from CP-H850R raw carbon paper
and adds double-sided hydrophobic treatment plus a single-sided MPL.
CP-H850R is the raw carbon-paper substrate, while CP-H850M is more specifically oriented toward GDL and gas-diffusion-electrode applications.
Q2: Why is CP-H850M considered a thick carbon paper?
Its thickness is 0.88±0.02 mm, substantially thicker than many conventional carbon-paper GDL substrates.
The thicker backing can provide more compression allowance, porous transport volume and mechanical support.
Q3: How is its conductivity characterized?
The supplied through-plane resistivity is <14 mΩ·cm².
This value can be used as one reference for through-thickness electron transport,
while actual interfacial resistance also depends on compression and contact conditions.
Q4: Why is double-sided hydrophobic treatment used?
The treatment helps reduce persistent liquid-water wetting of the porous carbon-fiber backing,
supporting gas-transport pathways. Actual water-management behavior also depends on temperature,
humidity, gas flow, compression and cell design.
Q5: 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, serving as an interfacial transition layer in GDL structures.
Q6: 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.
Q7: What should be considered when assembling a 0.88 mm carbon paper?
Flow-field depth, gasket thickness and target compression ratio should be considered together.
Excessive compression may alter the pore structure and transport pathways of the thick carbon-fiber backing.
Q8: Should the area-density and permeability units be verified?
Yes. The supplied specification lists area density as 480–490 g/cm² and through-plane permeability as >0.1 cm S.
These values are retained as supplied on this page, and the units should be verified before final technical publication if necessary.
10
International Orders & Shipping
SCI Materials Hub · Worldwide Supply
Request a Quote for CP-H850M
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