ATH

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:

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:

• 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.