Calidria

Calidria is the trade name for a short-fiber chrysotile asbestos product mined and processed by Union Carbide Corporation from a deposit near Coalinga, California. It was marketed from the 1960s through the 1980s as a supposedly "safer" or less hazardous form of asbestos because of its short fiber length and was sold for use in joint compounds, paints, coatings, plastics, and other consumer and industrial products.

Origin

The name Calidria was coined by Union Carbide as a brand name, derived from "California" combined with a stylized ending, when the company began commercial production at its King City and Coalinga, California operations in the early 1960s. The deposit itself sits in the New Idria serpentinite body in the Diablo Range, which Union Carbide developed after acquiring the mineral rights in the late 1950s.

According to the 1986 Sourcebook on Asbestos Diseases, which spells the name both "Calidria" and "Calindria," Calidria came from the asbestos deposit near Coalinga and was sold as pellets that were 95 percent asbestos.¹ The book lists floor tile, drilling fluids, friction materials, plastics, roofing compounds, papermaking, rubber compounds and mineral board among its uses, and names T-135, a sprayed acoustical product, as one that used Calidria asbestos.¹²

Significance in Asbestos Context

Calidria is important to many patients' cases because Union Carbide aggressively marketed it as low-hazard chrysotile and supplied it to dozens of manufacturers, including makers of drywall joint compound used by drywallers, tapers, painters, and home remodelers throughout the 1960s, 70s, and early 80s. Fiber analysis and provenance work can sometimes identify Calidria-derived chrysotile in lung tissue or in product samples by its distinctive short fiber length and the presence of associated minerals from the Coalinga deposit. Despite Union Carbide's marketing, peer-reviewed studies and litigation evidence have linked Calidria exposure to mesothelioma and other asbestos diseases, undermining the "safer asbestos" claim that was used to keep the product in commerce.

Example Sentence

Her work history as a drywall finisher in the 1970s is significant because the joint compounds she sanded daily were formulated with Union Carbide's Calidria chrysotile.

Related Terms

Chrysotile, Joint Compound, Union Carbide, Provenance Analysis, Fiber Burden Analysis, Serpentinite

Notes

• If you or a family member worked with drywall joint compound, texture sprays, or certain paints and plastics between roughly 1963 and 1985, ask your legal team to investigate whether Calidria-containing products were in use at those job sites.
• Preserve any product packaging, purchase records, brand names of joint compounds (e.g., Georgia-Pacific, Hamilton, Kaiser, Bondex, and others that used Calidria), and employer records. Product identification is central to Union Carbide claims.
• Ask whether tissue digestion or fiber burden analysis could help establish chrysotile exposure; short-fiber chrysotile clears from the lung faster than amphiboles, so timing of sampling and analytical method matter.
• Union Carbide internal documents discussing Calidria's hazards are part of the public record in asbestos litigation and may be directly relevant to proving the company knew of the risks it publicly downplayed.

References

1. Barbara J. Peters and George A. Peters, Sourcebook on Asbestos Diseases: Medical, Legal, and Engineering Aspects, vol. 2 (New York: Garland Law Publishing, 1986), p. 172.
2. Barbara J. Peters and George A. Peters, Sourcebook on Asbestos Diseases: Medical, Legal, and Engineering Aspects, vol. 2 (New York: Garland Law Publishing, 1986), p. 173.