page_title: Walnut
section_title: Cleaning
hierarchical_section_title: Walnut / Non-food applications / Cleaning
caption_attribution_description: English: Three-segment shell walnut. Bottom view. Français&#160;: Noix à 3 coques. Vue de dessous.
context_page_description: A walnut is the nut of any tree of the genus Juglans, particularly the Persian or English walnut, Juglans regia.
  A walnut is the edible seed of a drupe, and thus not a true botanical nut. It is commonly consumed as a nut. After full ripening for its edible seed when the shell has been discarded, it is used as a garnish or a snack. Nuts of the eastern black walnut and butternuts are less commonly consumed.
context_section_description: The United States Army once used ground walnut shells for abrasive blasting to clean aviation parts because of low cost and non-abrasive qualities. However, an investigation of a fatal Boeing CH-47 Chinook helicopter crash (September 11, 1982, in Mannheim, Germany) revealed that walnut grit clogged an oil port, leading to the accident and the discontinuation of walnut shells as a cleaning agent. Commercially, crushed walnut shells are still used outside of aviation for low-abrasive, less-toxic cleaning and blasting applications.
caption: A three-segment shell which occurs rarely.
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