Asbestos combines properties such as high elasticity and tensile strength at the same time, is resistant to vibration and aging, has low thermal conductivity but is heat resistant, the friction behavior is favorable and it has low electrical conductivity.
Asbestos has been used in:
- Electrical industry: for insulating the electric cable pipes.
- Textile industry: for ropes, fabrics, etc.
- Rubber industry: for gaskets, as filling material for car tires
- Car industry for brake and clutch linings
- Asbestos cement industry: where asbestos is processed into pipes, fittings and sheets
- Insulation industry: used to spray asbestos on ships, cold rooms and railroad wagons
- Paper industry: produces asbestos filters (Dyllick 2013).
Until the 2nd half of the 20th century, asbestos was also used medically e.g. in spontaneous pneumothorax or applied preoperatively to the pleural space to make it stick together (Ulmer 1976).
At the beginning of the 1980s, asbestos cement products were used in a proportion of 70-80%. Nowadays, the proportion is only about 30% (Dyllick 2013).
Health hazards
Already at the turn of the 19th / 20th century, health problems caused by inhalation of asbestos were recognized. But it was not until 1972 that the WHO's International Agency on Cancer confirmed a direct link between the inhalation of asbestos dust and the incidence of cancer (Dyllick 2013).
The cause is inhaled asbestos dust consisting of various silicates such as amosite, anthophyllite, chrysotile, crocidolite, and others, which have a fiber width of less than 3 µg in diameter and a length of more than 10 µg. Only with these size ratios, on the one hand, the fibers succeed in penetrating into the alveoli and, on the other hand, due to this, their elimination by the macrophages is significantly more difficult (Piper 2007).
Since 1929, asbestosis has been part of the Occupational Diseases Ordinance (Baur 2005).
In Germany, an ordinance on hazardous working materials was issued in 1972, and in 1973 the employers' liability insurance associations issued a regulation on "Protection against mineral dust hazardous to health."
As primary prevention measures, the production and use of asbestos was banned at the beginning of 1994 when the Hazardous Substances Ordinance of October 26, 1993 came into force (Büttner 2004).
Secondary prevention serves to prevent unavoidable exposure. Since materials containing asbestos are still present in many buildings today, demolition, renovation and maintenance of asbestos are now legally regulated by the Official Journal of the European Union, EU Directive 2009/148/EC on the protection of workers at work from asbestos (formerly: Directive 83/477/EEC). The Official Journal contains detailed information on dust control measures, wearing of special protective work suits, use of fine dust filters and regular occupational medical examinations (Büttner 2004).