Asbestos Fibres

Most common asbestos fibres used in construction.

Asbestos Fibers Properties

Asbestos Fibres of a concern have dimensions of 0.01-0.2 μm and 0.2-3.0 μm in width and 5.0-9.0 μm with the L/W ratio 3.

As an example of the most common asbestos minerals like Chrysotile with the mineral formula Mg3Si2H4O9 Mg3(Si2O5)(OH)4 H4Mg3O9Si2  Crocidolite Asbestos Fe2H16Mg3Na2O24Si8

With the PCM magnification up to 500x it is possible to count an asbestos fibres with the width 0.2 μm

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direct transfer or indirect transfer

Asbestos Fibres

  • Concrete

Chrysotile Asbestos

Mg3Si2H4O9 Mg3(Si2O5)(OH)4 H4Mg3O9Si2

12001-29-5

…………………………………………………..

Molecular Weight: 277.11 g/mol

Instruments: PCM SEM TEM

Inhalation Acute Reference Concentration (RfCa) (mg/m^3)

Inhalation Chronic Reference Concentration (RfC) (mg/m^3)

  • Reinforce Cement
  • Filters
  • Brake Pads
  • Sound Insulation (b1970s)
  • Special Resins
  • Reinforce Plastics
  • Roofing shingles
  • Ceiling and floor tiles

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Crocidolite Asbestos

Fe2H16Mg3Na2O24Si8

12001-28-4

Blue Asbestos

Molecular Weight: 855.38 g/mol

Instruments: PCM SEM TEM

Inhalation Acute Reference Concentration (RfCa) (mg/m^3)

Inhalation Chronic Reference Concentration (RfC) (mg/m^3)

  • Roofing shingles
  • Ceiling and floor tiles
  • Paper products
  • Asbestos cement
  • Friction products, automobile clutch, brake, transmission parts
  • Heat-resistant fabrics, packaging, gaskets, coatings
  • Some vermiculite or talc products

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Amosite Asbestos

Fe7H2O24Si8

12172-73-5

Brown asbestos
Grunerite asbestos

Molecular Weight: 1001.6 g/mol

Instruments: PCM SEM TEM

Inhalation Acute Reference Concentration (RfCa) (mg/m^3)

Inhalation Chronic Reference Concentration (RfC) (mg/m^3)

  • Roofing shingles
  • Ceiling and floor tiles
  • Paper products
  • Asbestos cement
  • Friction products, automobile clutch, brake, transmission parts
  • Heat-resistant fabrics, packaging, gaskets, coatings
  • Some vermiculite or talc products

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Anthophyllite Asbestos

XFe2+7Si8O22(OH)2

77536-67-5

Ferroanthophyllite

Molecular Weight: g/mol

Instruments: PCM SEM TEM

Inhalation Acute Reference Concentration (RfCa) (mg/m^3)

Inhalation Chronic Reference Concentration (RfC) (mg/m^3)

  • Home maintenance

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Tremolite Asbestos

Ca2Mg5Si8O22(OH)2 ; Ca2(Mg5.0-4.5Fe2+0.0-0.5)Si8O22(OH)2

77536-68-6

Actinolite (Ca2Mg5H2(SiO3)8)

Molecular Weight: g/mol

Instruments: PCM SEM TEM

Inhalation Acute Reference Concentration (RfCa) (mg/m^3)

Inhalation Chronic Reference Concentration (RfC) (mg/m^3)

  • Acid resisting applications
  • Ceramics
  • Paint

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Actinolite Asbestos

77536-66-4

Aktinolith

Molecular Weight: g/mol

Instruments: PCM SEM TEM

Inhalation Acute Reference Concentration (RfCa) (mg/m^3)

Inhalation Chronic Reference Concentration (RfC) (mg/m^3)

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PCM - phase contrast optical microscopy

SEM - scanning electron microscopy

TEM - transmission electron microscopy, direct transfer or indirect transfer

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