21645-51-2

Fine Precipitated Aluminium Hydroxide.( Al(OH)3, CAS No. 21645-51-2 ) is one type ATH with ultrafine particle size, regular crystal structure, high-purity, high whiteness, low surface activity and small specific surface area, Fine Precipitated Aluminium Hydroxide. can be widely used in various of processing technology.
Aluminum hydroxide (ground type, ( Al(OH)3 CAS No. 21645-51-2 ) is made of wet aluminum hydroxide powder by drying, grinding and sieving to get various grades with different particle sizes. Alumninum hydroxide is used as environmentally-friendly halogen- free flame retardant additives in a wide variety of applications.
Low-viscosity Aluminum Hydroxide ( Al(OH)3 CAS No. 21645-51-2 ) behave as flame retardant filler in pouring sealant, BMC,SMC and other industries. Compared with ordinary aluminum hydroxide, its particle size distribution is narrower and more concentrated, the viscosity is lower. Low-viscosity Aluminum Hydroxide is divided into four grades according to particle size.

Physical and Chemical Properties

General Properties

Molecular Weight	78
Density	2.42 g/cm3
Crystal System	Monoclinic System
Mohs Hardness	3
Ratio of Refraction	1.57
Appearance	White Powder

Fine Precipitated Aluminium Hydroxide

Items	Unit	Index
Al(OH)3	%	≥99.4
SiO2	%	≤0.02
Fe2O3	%	≤0.02
Na2O	%	≤0.3
Na2O (Soluble)	%	≤0.015
Moisture	%	≤0.3
Loss on ignition (600℃ )	%	34.5±0.5
Whiteness	%	≥96
Particle size D50, Laser diffraction	μm	1.2~1.6
Particle size D50, Laser diffraction	μm	1.6~2.1
PH value	—	8.0-10.0
Oil absorption (linseed oil)	Ml/100g	≤40
Electrical conductivity	us/cm	≤30
Residue on Sieve	%	≤0.01

Key Advantage:

Low Na2O%: (Soluble Na2O%≤0.015%)

Low Electrical conductivity：≤30μs/cm

Low Residue content(on sieve)：≤0.01% (400Mesh)

Less black spots and impurities：≤25/100gram

Application:Recommended to be used in wires and cables, copper clad plates(CCL), composite insulators, heat insulation material, etc.

Packaging:Net weight 25kg/bag, Compound paper-plastic bag

Storage and Attention: Keep in dry, room temperature and moisture proof condition, preventing the heating

Aluminum hydroxide (ground type)

Items	Unit	ATH-10	ATH-12	ATH-17	ATH-20
Al2O3	%	≥64.0	≥64.0	≥64.0	≥64.0
SiO2	%	≤0.04	≤0.04	≤0.04	≤0.04
Fe2O3	%	≤0.02	≤0.02	≤0.02	≤0.02
Na2O	%	≤0.4	≤0.4	≤0.4	≤0.4
Loss On Ignition	%	34.0~35.0	34.0~35.0	34.0~35.0	34.0~35.0
Moisture	%	≤0.3	≤0.3	≤0.3	≤0.3
Mean Particle Diameter	µm	8~12	12~15	15~18	18~22
Whiteness	HW-A	≥95	≥95	≥95	≥95
Whiteness	HW-B	≥93	≥93	≥93	≥93
Whiteness	GW	≥90	≥90	≥90	≥90
Whiteness	HW-A	≥95	≥95	≥95	≥95
pH value		8.5~11.5	8.5~11.5	8.5~11.5	8.5~11.5

Application:Recommended to be used in plastics composites, conveyer belt, epoxy sealing and other rubber based compounds

Packaging:Net weight 25kg/bag, Compound paper-plastic bag

Storage and Attention: Keep in dry, room temperature and moisture proof condition, preventing the heating 

Low-viscosity Aluminum Hydroxide

Items	Unit	HT-205 LV-2	HT205 LV-3	HT-205 LV-5	HT-205 LV-8
（Al2O3）	%	≥64.5	≥64.5	≥64.5	≥64.5
（SiO2）	%	≤0.04	≤0.04	≤0.04	≤0.04
（Fe2O3）	%	≤0.02	≤0.02	≤0.02	≤0.02
（Na2O）	%	≤0.4	≤0.4	≤0.4	≤0.4
Loss on Ignition(1100°C)	%	34.～ 35.0	34.0 ～ 35.0	34.0 ～ 35.0	34.0 ～ 35.0
Moisture (105 °C)	%	≤0.5	≤0.5	≤0.5	≤0.5
Whiteness	%	≥96	≥94	≥93	≥92
pH	--	8.5 ～ 11.5	8.5 ～ 11.5	8.5 ～ 11.5	8.5 ～ 11.5
Particle Size ,D50	µm	≤2.8	2 ～ 4	4 ～ 6	6 ～ 9

Key advantages

● Low viscosity
● Narrow particle size distribution
● Optional different grades
● Low oil absorption
Application: Low-viscosity Aluminum Hydroxide is widely used in BMC, SMC, laminate, pouring sealant and other industries.
Packaging:Net weight 25kg/bag, Compound paper-plastic bag
Storage and Attention: Keep in dry, room temperature and moisture proof condition, preventing the heating

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