Omya Smartfill

Prevention of hydrolysis and ductility improvement in demanding polymers

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Omya Smartfill is a calcium carbonate with an innovative modification that outperforms conventional calcium carbonate in most engineering polymers like Polyamides and Polycarbonate and in biopolymers that hydrolyse easily during extrusion, such as PLA and PHA.

Polyamide (PA) with improved ductility at lower cost

Omya Smartfill improves the elongation and impact strength of polyamides due to an improved isotropy and provides processing benefits such as reduced warpage and improved surface finish in glass fiber compounds.


Compared to other minerals such as wollastonite, talc and kaolin, Omya Smartfill offers higher impact strength and excellent whiteness.

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Elongation at break


Charpy Notched Impact


HDT (120°C /1,80 Mpa)

[°C ]

Daunyl DPN 27 AV (Natural PA6)319082.460
PA6 + 30% Omya Smartfill 55 - AV3930194.165

Omya Smartfill improves the overall performance of the PA6GF30 compound

PA6GF30 compound has improved overall stiffness, strength and toughness when replacing 5% glass fiber with 10-20% of Omya Smartfill.

  Omya Smartfill
PA6GF30E-Modulus [N/mm2]8,0709,01010,600
Charpy notched [kJ/m2]10.811.110.0
Yield Strength [N/mm²]142135130
PA6GF25E-Modulus [N/mm2] 8,06010,400
Charpy notched [kJ/m2] 10.49.8
Yield Strength [N/mm²] 122133
PA6GF20E-Modulus [N/mm2] 6,7407,370
Charpy notched [kJ/m2] 8.18.6
Yield Strength [N/mm²] 106106

Polyamides are significantly more expensive and have a higher carbon footprint than Omya Smartfill. Using Omya Smartfill in polyamides and polyamide-glass fiber compounds improves both cost and carbon footprint.

Benefits of Omya Smartfill in Polyamide

  • Higher ductility compared to other minerals
  • Reduced warpage
  • Improved surface finish in GF compounds
  • Excellent whiteness
  • Reduced carbon footprint
  • Increased recycled content

Download the Omya Smartfill in Engineered Polymers brochure

White Polycarbonate (PC) with improved stiffness, excellent opacity and lower cost

Pigments and minerals lower the mechanical performance of non-transparent polycarbonate. Other minerals and pigments degrade Polycarbonate and reduce its mechanical properties.


Thanks to an innovative surface modification, Omya Smartfill offers improved properties compared to conventional calcium carbonate and titanium dioxide, which increases both the modulus and impact resistance.


Omya Smartfill can partially replace titanium dioxide without affecting the color values, thus improving the environmental impact and overall costs.

MaterialModulusYield Strength

Elongation at Break

Charpy Notched Impact

OpacityColor Value
 [MPa ][MPa ][%][kJ/m²][%]Lab
94% PC + 6% TiO₂2459634391009303
90% PC + 3% TiO₂ + 7% Omya Smartfill254660231210092-13

Benefits of Omya Smartfill in Polycarbonate

  • Improved impact strength in white Polycarbonate
  • Increased stiffness
  • Excellent whiteness
  • Lower overall costs
  • Reduced carbon footprint
  • Increased recycled content*

*on selected grades

Download the Omya Smartfill in Engineered Polymers brochure

Improving the performance of Polylactic Acid (PLA) and Polyhydroxyalkanoate (PHA)

Omya Smartfill does not hydrolyse PLA and PHA like other calcium carbonates and improves both PLA stiffness and elongation, making PLA more ductile without additional impact modifiers.

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Benefits of Omya Smartfill in PLA

  • Increases stiffness and elongation
  • Increases impact resistance
  • Colors PLA white
  • Reduces formulation costs
  • Accelerates heat transfer (heating / cooling)

Download the Omya Smartfill for biopolymers flyer


Omya Smartfill  0%10%20%40%
Tensile ModulusN/mm23200360041004900
Tensile Strength at YieldN/mm268574838
Elongation at Break%5.5509028
Melt Flow Rate
210 °C / 2.16kg
g/ 10 min23212023

Sustainability and Composability

Omya Smartfill is made of natural and renewable calcium carbonate and fulfils the requirement for composting.

Carbon footprint of CaCO3

Be part of the solution with Omya Smartfill

Some Omya Smartfill grades are made of 100% recycled calcium carbonate, certified by Bureau Veritas and food contact approved.

bureau veritas

Technical support

Omya has a highly experienced technical services team which supports customers throughout the process of product development. Our pilot compounding and production lines combined with our extensive testing laboratories enable process optimization and product innovation.

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