Nanomaterials are an industrial revolution in a microcosm, with the potential to yield extraordinary health, environmental, and other global social benefits.

But they're substantially unregulated, underassessed for their impact on health and the environment, and they've been raising cautionary flags for insurers whose core business is managing financial risk.

Serious environmental and health concerns have already surfaced for particular nanomaterials, including indications that one particular form (carbon nanotubes) can cause lung damage similar to asbestos in laboratory animals.

If your company's thinking about incorporating nanomaterials into your products, you'll need to exercise especially demanding due diligence to make sure you're not taking on liabilities that you and your shareholders will come to regret. Nanomaterials are particles smaller than 1,000 nanometers, roughly equivalent to 1/100,000 the width of a human hair; those materials smaller than 100 nanometers have been of especially great concern.

Nanomaterials have been engineered to exhibit special qualities or functions that have applications across a broad range of products, from solar panels to food packaging to drug delivery. But their specially engineered characteristics represent a double-edged sword -- their size and shape may contribute to novel toxicity risks. Their small size may allow them to penetrate bodily defense systems that shut out larger particles and interfere with bodily processes that otherwise would be protected.

Swiss Re, the world's second largest reinsurer, raised questions about nanotechnology as early as 2004, in "Nanotechnology: Small Matter, Many Unknowns" (PDF). In a March 2009 commentary, a Lloyd's of London analyst drew parallels between the global financial meltdown and risks from nanomaterials. The financial collapse reflected "blithe acceptance of complex products that many didn't understand." With regard to nanomaterials, he commented that "the importance of getting to grips with and quantifying complex sources of risk has never been more obvious."

So many authoritative bodies have warned about the unknown and under-researched hazards of nanomaterials that it's beginning to sound like a chorus. If these misgivings go unheeded, that would be tragic on multiple counts. Not only because the potential benefits from the burgeoning forms of nanotechnologies will founder and be lost on the shoals of public mistrust and rejection, but also because companies and their shareholders will see corporate financial values vaporize in the face of closed markets and possible litigation.

Government regulatory bodies are beginning to stir, but government regulation is in its infancy. California, Canada and the European Union have recently taken steps to get manufacturers to provide information about nanotech products. In February 2009, Environment Canada indicated it would be requesting information from companies about their products and in January 2009 California's Department of Toxic Substances Control sent out an information request. The European Union's newly updated cosmetics legislation will require disclosure of information about nanomaterials in cosmetics.

The U.S. EPA has also initiated a handful of regulatory actions under the Toxic Substances Control Act. EPA also launched a Nanoscale Materials Stewardship Program (NMSP) under which industry has been invited to voluntarily submit pertinent data. There were 29 submissions by the end of 2008, covering 123 different nanoscale materials, constituting perhaps only 10 percent of the materials likely to be commercially available. There was a similarly poor experience with an earlier U.K. program that received just 13 submissions in two years. Andrew Maynard and David Rejeski of the Project on Emerging Nanotechnologies at the Woodrow Wilson International Center for Scholars, in a July 2009 commentary in the scientific journal Nature, conclude from these figures that "voluntary reporting of nanomaterials by industry has failed" and while "mandatory measures are a step in the right direction … the field needs more data sharing and oversight."

Investors are concerned that existing financial disclosure regulations do not require companies to sufficiently disclose the potential liabilities associated with production and use of nanomaterials. In "Bridging the Credibility Gap: Eight Corporate Liability Accounting Loopholes that Regulators Must Close," Investor Environmental Health Network (IEHN) counsel Sanford Lewis points out that under existing disclosure requirements from the Securities and Exchange Commission and the Financial Accounting Standards Board, companies don't have to disclose as much as they ought to about the potential liabilities they're facing. These are the very same reporting requirements that permitted companies to legally understate their potential liabilities from asbestos litigation until the moment that they declared bankruptcy and wiped out shareholder value. IEHN's report builds on The Rose Foundation's 2004 environmental accounting report, "Fooling Investors, Fooling Themselves," whose title foreshadowed the Lloyd's commentary cited above.