A Comparison of Asbestos Fibers with Synthetic Crystals Known as "Whiskers"

Our plain-English summary of A Comparison of Asbestos Fibers with Synthetic Crystals Known as "Whiskers", by J.S. Walker, T. Zoltai (1979).

The study

• Authors: J.S. Walker, T. Zoltai
• Published: Annals New York Academy of Sciences p.687-704 (1979)
• Type of article: Journal article
• Our copy: from Johns-Manville's own medical library. The article is still under copyright, so we describe it here rather than post it.

In plain English

This article was a discussion paper, not a health study. It drew on published work about synthetic "whiskers" (tiny, very strong single crystals of metals and ceramics) and compared them with asbestos fibers. It did not study workers, patients or disease. The authors described how small crystals with few flaws resist breaking far better than ordinary crystals. They argued that asbestiform minerals differ from nonasbestiform forms of the same minerals partly through greater crystalline perfection. They stated that good quality amphibole asbestos has tensile strength approaching 30,000 kg/cm². Their own crude, exploratory measurements on nonasbestiform amphibole crystals gave values around 1000 kg/cm². They suggested that chrysotile and tubular graphite whiskers appear to be structural analogs. They also suggested that etch pit density might help tell asbestiform amphibole from cleavage fragments in air and water samples. The authors concluded that whiskers may be considered synthetic analogs of asbestos fibers, and that the terms asbestiform and whisker should be considered synonymous. They noted that published strength values for asbestos are probably underestimated.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

What the study did and found

• Design: Review and theoretical comparison of published whisker research with asbestos fibers, with one crude exploratory strength test by the authors; no human or animal health data
• Who was studied: No people were studied. The materials compared were synthetic whisker crystals (metallic, ionic and ceramic) and asbestos fibers, including commercial asbestos, amphibole asbestos, crocidolite, cummingtonite and chrysotile, along with nonasbestiform (acicular or prismatic) amphibole
• Exposure: Not an exposure study. The minerals discussed were asbestiform and nonasbestiform amphiboles (including crocidolite and cummingtonite) and chrysotile, compared with synthetic whiskers
• Main results:
  • The authors stated that good quality amphibole asbestos has a tensile strength approaching 30,000 kg/cm²
  • The authors' own crude, exploratory measurements on nonasbestiform amphibole crystals gave values around 1000 kg/cm²
  • The authors stated that chrysotile and tubular graphite whiskers appear to be structural analogs
  • The authors proposed that etch pit density might help distinguish asbestiform amphibole from amphibole cleavage fragments in air and water samples
• The authors' conclusion: The authors concluded that whiskers may be considered synthetic analogs of asbestos fibers, and that the terms asbestiform and whisker should be considered synonymous
• Limitations the authors state:
  • No specific data existed on the tensile strength of acicular (nonasbestiform) amphiboles; the authors' own test was described as crude
  • Reported strength values for asbestos fibers are probably underestimated, because investigators tested the larger fibers
  • Reported whisker strength values are an average biased by the testing method
  • Direct and thorough comparisons of asbestos and whiskers had not been made

Topics

Medical terms in this study, explained in our Lexicon: Single Crystal, Asbestiform, Non-Asbestiform, Crystalline, Amphibole Asbestos, Tensile Strength, Amphibole Group, Chrysotile.

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