Extender Pigment

Definition - What does Extender Pigment mean?

An extender pigment is a naturally occurring chemical substance (usually having a white color) that is added to a paint or coating to improve its properties such as durability, cost, and resistance to corrosion or wear.

Corrosionpedia explains Extender Pigment

Some examples of extender pigments are alumina, carbonates and silicates. They are colorless, transparent and homogeneous in binder films.

Extender pigments are solid particles with a wide range of particulate sizes. The solid component of these pigments makes them adequate fillers to increase the volume of a paint with limited binders. This makes the paint more structurally sound and resistant to external wear-causing factors.

Two separate extenders can often be mixed to generate a unique degree or form of pigment packing that can be modified to suit several applications. Any additional pigment introduction does not compromise the mechanical durability of the paint.

Extender pigments can provide added benefits based on its chemical properties and how these properties react with a parent paint substance. Some benefits include:

  • Increased ease of paint application
  • Increased adhesive properties
  • Improved film roughness
  • Improved paint bulking
  • Increased paint film hardness
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