В соответствии с указанием ГТК России от 22.07.92 N 01-12/80 "О порядке пропуска гробов и урн с прахом умерших"
Clean, dried bones or bone fragments; human hair; teeth; fingernails or toenails; or human remains that have been cremated may be admitted into the United States without restriction, regardless of the cause of death. The Transportation Security Administration (TSA) requires ashes be carried in a temporary box of wood, light plastic or cardboard because urns are too dense to allow screeners to see the contents on an X-ray machine.
To obtain additional information on the requirements to transport ashes/cremated remains visit the TSA Web
https://www.tsa.gov/travel/security-scr ... /printable