ATH

Mineral: Synthetic ATH

ATH (aluminium tri hydrate, chemical formula Al(OH)₃) is an intermediate product of aluminium production, characterised by: 

• High purity (99.5%)
• 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 180-200°C, releasing water 

Mineral: Natural ATH (Gibbsite)

Gibbsite is a naturally occuring ATH, characterised by: 

• High purity (90-95%)
• 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 180-220°C, releasing water 

Basic properties

Property	Sythetic ATH	Natural ATH	Unit
Moisture	< 0.4	<0.7	[%]
pH	9	5	[-]
Hardness (Mohs)	3	3	[-]
Refractive index	1.57	1.57	[-]
Electrical conductivity	60	–	[µS/cm]
L.O.I.	34.5	31	[%]
Density	2.4	2.4	[kg/ dm3]

Application specific products:

Product	Grade	D50 [µm]
Portaflame SG	7HB	2.3
	10	3.8
	20	5.5
	25	8
	35	15
	40	11.5
	50	16
	63	23
	10 LSA	3.3
	25 LSA	5.0
	30 LV	9.5
	55 LV	15
	100 LV	33
Portaflame G	63	6

 

Production location(s): Maastricht (NL), Geertruidenberg (NL),  Poviglio (IT), Balaruc (FR), Brassington (UK)

Functionality: flame retardancy and durability