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Acid Copper Chromate (ACC)
Wood preservatives containing ACC are only registered for industrial and commercial uses. ACC treated wood contains hexavalent chromium or chromium (VI). Chromium (VI) is a chemical in the highest EPA toxicity category for oral, dermal, and inhalation toxicity and is also a strong skin sensitizer. Protective equipment is usually required when producing or handling ACC treated wood. See the resources below for more information.
For help selecting the proper type of treated wood for any setting, consider consulting the primary standard-setting body for treated wood, the American Wood-Preservers' Association (AWPA).
If you have questions about this, or any pesticide-related topic, please call NPIC at 1-800-858-7378 (7:30am-3:30pm PST), or email us at npic@ace.orst.edu.
Additional Resources on ACC Treated Wood:
- Update on Pressure Treated Lumber - Cornell Cooperative Extension Service
- Changes in Pressure-Treated Wood for Residential Construction - USDA Forest Products Laboratory
- Chromium (VI) (Hexavalent Chromium) - Occupational Safety & Health Administration (OSHA)
- Acid Copper Chromate (ACC) Residential uses Won't be Reregistered - U. S. Environmental Protection Agency (EPA)
- Product Cancellation Order to Delete ACC Uses in Certain Pesticide Registrations - U. S. Environmental Protection Agency (EPA)
- Public Health Statement: Copper - Agency for Toxic Substances and Disease Registry (ATSDR)
- Public Health Statement: Chromium - Agency for Toxic Substances and Disease Registry (ATSDR)
- ToxFAQs for Chromium - Agency for Toxic Substances and Disease Registry (ATSDR)
- ToxFAQs for Copper - Agency for Toxic Substances and Disease Registry (ATSDR)
- Toxicological Profile: Chromium - Agency for Toxic Substances and Disease Registry (ATSDR)
- Toxicological Profile: Copper - Agency for Toxic Substances and Disease Registry (ATSDR)
- Case Studies in Environmental Medicine: Chromium Toxicity - Agency for Toxic Substances and Disease Registry (ATSDR)
- Standards and Regulations for Chromium Exposure - Agency for Toxic Substances and Disease Registry (ATSDR)
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