ATH

ATH (aluminium tri hydrate, chemical formula Al(OH)3)

is a sidestream from the production of aluminium. ATH can be characterized by:

 

• High purity;
• High whiteness;
• Relatively low density of 2.4 g/ cm3 compared to other mineral fillers, which are typically at 2.7 g/ 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:

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

 

Production locations Portaflame SG, Portafill A

 

Application

ATH will provide:

• Sandability: due to its fairly low hardness of 3 on Mohs scale, a coating with ATH is still relatively easy to sand, giving the perfect basis for a high gloss finish
• Chemical resistance: due to its inert nature, ATH will provide good chemical resistance compared to conventional fillers.