Quality

Acetylene Purity Standard

Thai standard TIS229-2540 specifies two quality classes of acetylene.

Class 1: Purity 99.5% 'Laboratory grade'
Class 2: Purity 98.0% 'Industrial grade'

Some applications require higher grade called Atomic Absorption (AA grade).

Japanese International standard JIS K1902-1980 specifies acetylene purity of 98.0%.

	Class 2	Class 1	AA Grade	JIS K1902
Acetylene purity	98.0%	99.5%	99.6%	98.0%
Hydrogen phosphene	<500 ppm	<50 ppm	<25 ppm	Not specified
Hydrogen sulfide	<500 ppm	<50 ppm	<25 ppm	Not specified
Moisture	<0.25%	<0.25%	<0.25%	Not specified
Ammonia	Not specified	Not specified	Not specified	Not specified

Image: Dimethyl sulfoxide (DMSO) is used to quantify purity level of acetylene.

Image: GASTEC sampling pump together with gas detector tubes are used to test traces of impurity in ppm. The impurities are hydrogen phosphene, hydrogen sulfide, and ammonia.

Image: Our routine tests can ensure that the impurities are well below required standard.

Image: Good quality oxy-acetylene is shown with light blue color of the flame. When acetylene is mixed with an excess of oxygen, it burns with a very hot blue flame as high as 3000°C.