Asbestos

group of highly stable, non-flammable silicate minerals with a fibrous structure

Asbestos is a set of six silicate minerals which occur naturally. White asbestos makes up 95% of the asbestos found in buildings. It occurs in all parts of the world. It is fibrous, heat resistant and non flammable. These properties made it very attractive as a component in building materials and other products such as insulation and automobile brake pads. People have used asbestos throughout history. Ancient Egyptian people used asbestos. Asbestos is extremely dangerous for human health, as it can cause lung diseases such as asbestosis, emphysema and mesothelioma if the fibres get loose in the air and are breathed in. It can also harm animals such as livestock or pets.

The roof of this building is made of asbestos
A piece of Asbestos
Fibers of Anthophyllite are what makes asbestos dangerous. This image was taken with an electron microscope

Asbestos was linked to lung cancer in the early 1970s,[1] and was replaced by other materials in most applications by 1980.

Types of asbestos

change

There are six types of asbestos:

Substitutes

change
  • Fiberglass - This is the most popular substitute. Fiberglass is physically similar to asbestos and its safety is also being questioned. Fiberglass has been called "man-made asbestos".
  • Carbon fiber - Lighter weight than fiberglass or asbestos, but not heat resistant
  • Wood fiber mixed with cement (in non-heat applications)
  • Various polymer and plastic fibers
  • Asbestos rope can be replaced with synthetic or fiberglass rope.
  • Vermiculite insulation is a common substitute, although vermiculite itself can be contaminated with asbestos
  • Basalt fiber is a mineral fiber with properties similar to asbestos. It is suitable for high-heat applications.
  • Mineral wool is a common substitute that is popular in Europe
  • Silica aerogel is the best insulator available. It is non-fibrous and is not believed to cause cancer if inhaled into the lungs.
  • Asbestos siding or roofing can be replaced with aluminum or steel siding or roofing.

Disposal

change

Since asbestos is so resistant to heat, water, and chemicals, it is very difficult to destroy. It can be melted in a furnace to make a non-hazardous glass-like substance. This requires very high temperatures (1200°C or more) and consumes a lot of energy.

Lawsuits

change

Many companies that use or used to use asbestos have been sued by current or former employees who got sick with mesothelioma or asbestosis.[source?]

Many lawyers specialize in asbestos-related lawsuits.

References

change
  1. Burke, Bill (6 May 2001) "Shipyards, a Crucible for Tragedy: Part 1: How the war created a monster" Virginian-Pilot Norfolk, Virginia (newspaper)

Other websites

change