1. Brief introduction of Industrial Hydrofluoric Acid

Hydrofluoric Acid (CAS NO.7664-39-3) is a inorganic acids and appears colourless gas with a pungent odour or colorless transparent fuming liquid. Industrial Hydrofluoric Acid means the Hydrofluoric Acid in industrial grade. Most, this chemical can be produced in Industrial grade, electronic grade in the hydrofluoric acid market. Hydrofluoric Acid is stable and incompatible with glass, alkali metals, light metals, alkaline earth metals. The hydrofluoric acid market in China is enormous for this chemical can be used admeasurement SiO₂ and some chemical analysis.

2. How to get the Industrial Hydrofluoric Acid?

Hydrofluoric acid can be got by treatment of the mineral fluorite (CaF₂) with concentrated sulfuric acid. When combined at 265 °C, these two substances will react to produce hydrogen fluoride and calcium sulfate according to the following chemical equation:

CaF₂ + H₂SO₄ → 2 HF + CaSO₄

Xinxiang Yellow River Fine Chemical Industry Co., Ltd ,founded in 1992, is a leading fluoride manufacturing base in China. Its industrial Hydrofluoric Acid is on the top purity of 99.8%. The detailed specification is as follows:
 

Industrial hydrofluoric acid GB7744－1998

 

Item Name	Details
	Best    quality	First quality		Qualifier
		HF-40	HF-55	HF-40	HF-55
Hydrogen fluoride %≥	40.0	40.0	55.0	40.0	55.0
Hydrofluosilicic acid %≤	0.02	0.2	0.5	2.5	5.0
Fixed acid(H2SO4)  %≤	0.02	0.05	0.08	1.0	2.0

The HF content range from 40% to 70% upon clients' request.

And the specifications of Anhydrous hydrofluoric acid:

 

Anhydrous hydrofluoric acid
Item Name	Details
	A	B	C
Hydrofluoric Content ppm ≥	99.99	99.95	99.90
Moisture  ppm≤	50	300	600
Fluorsoilicic Acid ppm≤	30	100	200
Sulfur dioxide(SO2) ppm≤	20	70	150
Non-volatile Acid(H2SO4) ppm≤	20	50	200
As ppm ≤	5	10