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Classification by particle size

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Electronic Sealing Material

Classification:

According to Use

Aluminum hydroxide [Al(OH)3] has the functions of flame retardancy, smoke reduction, and filling, and it does not cause secondary pollution during combustion

Key words:

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Electronic Sealing Material

Aluminum hydroxide [Al(OH)₃] has the functions of flame retardancy, smoke reduction, and filling, and it does not cause secondary pollution during combustion. It also has the advantages of high heat absorption, low price, and wide source, and has been widely used in materials such as electronic sealing adhesives.

Al(OH)₃（ordinary）

CAS NO. 21645-51-2

▎General Properties

Molecular weight

Mohs hardness

Density g/cm³

2.4

Ratio of refraction

1.58

▎Physical and Chemical Properties

Item/Model		HJM-7	HJM-8	HJM-20	HJM-8G	HJM-10G	HJM-10K	HJM-20K
Chemical constituent	Al(OH)₃ [%] ≥	99.5	99.5	99.5	99.5	99.5	99.5	99.5
	Al₂O₃ [%] ≥	64.5	64.5	64.5	64.5	64.5	64.5	64.5
	SiO₂ [%] ≤	0.02	0.02	0.02	0.02	0.02	0.02	0.02
	Fe₂O₃ [%] ≤	0.01	0.01	0.01	0.01	0.01	0.01	0.01
	Na₂O [%] ≤	0.30	0.30	0.30	0.30	0.30	0.30	0.30
	Loss on ignition ≤	35.0	35.0	35.0	35.0	35.0	35.0	35.0
	Attached water ≤	0.3	0.3	0.3	0.3	0.3	0.3	0.3
	+325 mesh 325 mesh≤	0.01	0.01	25	0.01	0.1	0.1	25
	oil absorption ≈	27	26	21	24	24	27	22
Mean particle diameter （D50） µ m≈		7	9	20	8	10	10	20
Whiteness [R457] ≥		95	94	91	97	97	92	87
PH value ≈		9