Consumer Goods – writing Instruments

Coloring Marker Nibs and Reservoirs

Color with Confidence Using the Ultimate Ink Flow Management Engine

Coloring Markers with Maximum Ink Utilization & Leak Protection

As a global leader in the science of ink flow management, Porex has a broad portfolio of products to optimize your coloring marker’s performance. Porex coloring marker nibs are designed with the perfect porosity and capillarity. When paired with our reservoir technology, which uses optimal fiber type, density, and wrap for your marker, you can create the ultimate ink flow management engine that maximizes ink utilization and provides the highest degree of leak protection. Made from a variety of thermoplastic materials with varying properties, our materials are moldable for high volume applications and customizable for easy fabrication and conversions. We provide large sheets, rolls, or other material formats specific for your needs.

Porex offers two distinct nib technologies depending on the specific design needs of your coloring marker writing instrument:

  • POREX® sintered particle nibs are 3D-molded porous plastic nibs with the ideal mix of porosity and capillarity to deliver ink to the writing surface. Safe for children’s applications, our sintered PE nibs write with a smooth, durable feel.
  • POREX® polyester fiber nibs are a combination of polyester fiber and bonding resin, optimized for high ink flow and shaped to your coloring marker’s specifications.

Porex XPE® reservoirs are formed from a controlled density of fibers in an extruded seal, allowing you to contain and deliver the maximum amount of ink to your coloring markers. Capillary forces and materials are customized to your specific requirements and to ensure leak protection.

Watch how porous nibs and reservoirs work together to manage ink flow

Options for customizing nibs and reservoirs for coloring markers

Key Features & Benefits

  • Customizable ink flow, capillarity, fiber types/densities, wrap materials, and sizes/dimensions
  • Maximum ink utilization
  • Highest degree of leak protection 
  • Won’t fray or mushroom out
  • Sharp, clear lines
  • Long-lasting
Sintered Particle Nibs
Nib Materials Polyethylene (PE)
Writing Applications Highlighters
Coloring pens
Whiteboard markers
Compatible Inks Water-based
Customizable Options Write-feel
Ink flow
Size and dimensions


Polyester Fiber Nibs (PET)
Nib Materials Polyester fibers (PET)
Writing Applications Permanent markers
Coloring pens
Whiteboard markers
Compatible Inks Water-based
Customizable Options Ink flow
Size and dimensions
XPE® Reservoirs
Core Materials Polyester
Exterior Materials Extruded polypropylene
Extruded nylon
Extruded polyester
Film and nonwoven
Applications Coloring pens
White board markers
Permanent markers and more
Inks Water-based
High pH
Customizable Options Performance features
Fiber types
Fiber densities
Wrap materials
Sizes and dimensions
Porous Laboratory Components

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Using Porous Plastics for Applying

Related Resources

The Science of Ink Flow Management Brochure

For over 50 years, POREX® has been the trusted choice for optimized nib and reservoir combinations that deliver exceptional performance and an enhanced writing experience.

How it Works Video Series: The Science of Ink Flow Management

How does a coloring or whiteboard marker apply ink consistently without leakage to a paper? See how it works in this video.

High-Efficiency Reservoirs Brochure

Learn more about POREX® high-efficiency reservoirs for writing instruments, designed to reduce ink waste while simultaneously enhancing writing performance.

Partnering with Crayola Video

Learn more about Porex’s longstanding partnership with Crayola for coloring marker reservoirs and nibs, including a story about the impact Crayola markers have had on our HR manager’s non-verbal son’s life.