On 17 July 2015, the U.S. Consumer Product Safety Commission (CPSC) has published the direct final rule  determining that unfinished and untreated wood from tree trunks does not contain heavy elements that would exceed the limits specified in the CPSC’s toy standard (ASTM F963-11). This determination means that third party testing for compliance with the solubility requirements is not required for certification purposes for unfinished and untreated wood in toys.
The rule will come into effect on 15 September 2015. However, if CPSC receives significant adverse comment by 17 August 2015, a notification will be published in the Federal Register withdrawing this rule before its effective date.
Unfinished and untreated wood refers to wood harvested from trees with no added surface coatings (e.g. varnish, paint, shellac, polyurethane) and no materials added to the wood substrate (e.g. stains, dyes, preservatives, antifungal, insecticides). Manufactured or engineered woods such as plywood, particle board or fibreboard are not included.
CPSC hired a contractor to conduct a literature review  of the presence of heavy elements in toys whose maximum solubility limits is specified in ASTM F963-11. The materials studied are unfinished and untreated woods, cotton, wool, linen, silk, bamboo, beeswax and paper. The evaluation of paper can rely on the research on wood and other fibres because those materials are used in paper production. The literature reviewed by the contractor does not support a Commission determination for any material other that unfinished and untreated trunk wood.
The Public Law no.112-28  directed the CPSC to seek comment to reduce the cost of third party testing requirements consistent with assuring compliance with applicable consumer product safety rule, ban, standards or regulation. Due to the natural nature of a particular material, if the Commission determines that children’s products made of that material will comply with CPSC’s requirements with a high degree of assurance, manufacturers do not need to have those materials tested by a third party conformity assessment body.