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What do you mean by tox number? When you say urethane do you mean Ethyl carbamate with a CASRN - 51-79-6? If your question is what is the toxicity of ethyl carbamate in humans, I offer the following information: The United States Environmental Protection Agency (USEPA) has determined that there is inadequate data to derive a number to quantify non-carcinogenic health effects by the inhalation route of exposure. The USPEA has not evaluated the carcinogenicity of ethyl carbamate. The International Agency for Research on Cancer has determined that ethyl carbamate is probably carcingenic to humans. If, on the other hand, your question is regarding polyurethane coatings typically used to seal wood floors, among other uses, then the question is what is the toxicity of many other chemicals (other than ethyl carbamate), some known, some unknown, some depending on the manufacturer and formulation.

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16y ago
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7mo ago

The National Toxicology Program (NTP) does not have a specific Chemical Abstracts Service (CAS) number assigned for urethane. However, the NTP does provide toxicity information for urethane under its alternate name ethyl carbamate.

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Q: What is the tox number for urethane?
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