ATH

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Product Benefits
Technical Details

ATH (aluminium trihydrate, chemical formula Al(OH)3) is a side stream of aluminium production, characterised by:

 

  • High purity
  • High whiteness
  • Relatively low density of 2.4g/cm3 compared to other mineral fillers, which are typically at 2.7g/cm3
  • Medium Mohs hardness of 3
  • Decomposition around 180°C, releasing water.

 

Basic properties

 

Property Value Unit
Moisture < 0.4 [%]
pH 9 [-]
Hardness (Mohs) 3 [-]
Refractive index 1.57 [-]
Electrical conductivity 60 [µS/cm]
L.O.I. 34.5 [%]
Density 2.4 [kg/ dm3]

 

 

Product overview

Non-flame retardant applications

Product Grade D50

[µm]

D97

[µm]

OA

[g/ 100 g]

L*
Portafill A7 2.4 6.5 27 98.5
A10 3.8 10 27 98.4
A25 7.3 24 21 97.0
A40 11.5 36 20 96.5
A25/10 13 35 18 98

 

Flame retardant applications

Product Grade D50

[µm]

D97

[µm]

OA

[g /100 g]

SSA

[m2 /g]

L*
Portaflame SG 20 5.4 18.2 24 5.3 97.5
SG 63 23 58 19 0.7 96.5
SG 100LV 26 120 10 1 96.5
SG 200 90* -* 10 -* 94

 

Production locations Portaflame SG, Portafill A

Portafill A and Portaflame SG are the brand names for Sibelco’s ATH products:

 

  • Portafill A is used in applications, where flame retardancy is not required, such as powder coating applications.
  • Portaflame SG is used in flame retardant applications, such as ETICS (External Thermal Insulation Composite Systems)/EIFS (External Insulation Finishing Systems).

 

Benefits

  • Dirt pick-up resistance: the presence of ATH improves the coating’s resistance to dirt (from the atmosphere, for example).
  • Ease of tinting: due to the combination of refractive index, brightness and colour, paints with ATH provide excellent reproducible colour results when working with tinting systems.
  • Sandability: due to its fairly low hardness of 3 on Mohs scale, a coating with ATH is still relatively easy to sand, making it perfect for achieving a high gloss finish.
  • Chemical resistance: due to its inert nature, ATH provides good chemical resistance compared to conventional fillers.
  • Abrasion resistance: due to its hardness of 3 on Mohs scale, ATH will increase the coating’s resistance to wear.
  • Clarity: due to its fairly low refractive index, ATH becomes transparent when combined with certain binder systems.
  • UV-curing compatibility: being transparent for UV radiation, ATH does not block the curing mechanism.
  • Gloss control: with the availability of ultrafine ground ATH (Portafill A7) and a product with an optimised particle size distribution (Portafill A25/10), it is possible to apply coatings with a broad range of gloss levels.
  • Increasing extruder output: the optimised particle size distribution of Portafill A25/10 provides better free-flowing properties. As a result, the material is easier to dose into the extruder, allowing the residence time inside the extruder to be optimised.
  • UV resistance: being insensitive to UV radiation, ATH will reduce the coating’s degradation.
  • Water spotting resistance: powder coatings formulated with ATH show less tendency for water spotting than similar coatings formulated with barium sulphate.
  • Stain blocking and stain resistance: ATH acts as a supporting mineral filler in stain blocking and stain resistant coatings.

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