HF halogen detection

HF halogen detection

Halogenated elements include five types: fluorine, chlorine, bromine, iodine, and astatine. Astatine is a radioactive element, and the commonly referred to halogens are four elements: fluorine, chlorine, bromine, and iodine. Halogen free control mainly involves chlorine and bromine.

Halogen compounds have received widespread attention due to their following hazards:

1. Some halogen compounds are harmful to the environment and human body: such as the persistent organic pollutant POP containing halogens;

2. Organic solvents containing halogens are ozone depleting substances (ODS)

When halogen-containing plastics encounter high temperatures, they will release hydrogen halides (HCl, HBr, etc.), forming acid mist when exposed to water vapor in the air;

4. When halogen-containing plastics burn, they produce dioxins, which are high accumulation and long-lasting carcinogens;

5. When halogenated plastic is burned, it will generate a large amount of thick smoke, leading to a decrease in visibility and affecting the identification of escape routes.

At present, halogenated plastics, especially those containing chlorine and bromine, are widely used in the electronic and electrical industry. Halogens in plastics include PVC, plasticizers, flame retardants, and other forms of halogens, such as pigments, pigments, and other organic halogens. Among common flame retardants, the majority are chlorinated flame retardants (CFRs) and brominated flame retardants (BFRs). There are over a hundred types of BFRs, which are inexpensive, have good flame retardancy, and have a very high cost-effectiveness. Therefore, they have been widely used and recognized. Common flame retardants include organic and inorganic flame retardants, while organic flame retardants include CFRs, BFRs, phosphorus based flame retardants, etc; Inorganic flame retardants include boron based flame retardants, aluminum hydroxide, magnesium hydroxide, red phosphorus, ammonium polyphosphate, antimony oxide, and molybdenum compounds, etc. Their flame retardancy is low and their addition is large, far less widely used than CFRs and BFRs. If the application of BFRs is now completely prohibited, it will be difficult to find alternatives with better flame retardancy than BFRs in the short term.

Meanwhile, halogen-containing plastics face significant challenges in both recycling and disposal, leading to an increasing number of customers paying attention to halogen-free plastics.

Regarding halogen-free requirements, there are provisions in IEC61249-2-21:2003 for printed circuit boards, with specific requirements of bromine<0.09% (900 ppm), chlorine<0.09% (900 ppm), and a total halogen content of<1500ppm.

The detection methods include:

IPC-TM-650 2.3.28.2; BS EN 14582:2007 standard;

IEC 61249:2003 Part 2.21 (IEC 61189:2006-3);

JY/T 020:1996 General Rules for Ion Chromatography;

GB/T9872-1998 Determination of halogens in rubber;

ASTM D 4327:2003 Determination of common anions in water, etc.

Standards and regulatory requirements