2845.40.00.00 - Helium-3

This HTS category, 2845.40.00.00, specifically classifies Helium-3. Helium-3 is an isotope of helium, distinct from the more common Helium-4. It is a noble gas and an element with atomic number 2, characterized by its unique nuclear properties, including its odd number of protons and neutrons. Its rarity and specific applications, particularly in scientific research, nuclear technology, and specialized cooling systems, distinguish it from other isotopes and compounds classified under heading 2845.

Unlike its sibling categories, which cover heavy water (deuterium oxide), boron enriched in boron-10, and lithium enriched in lithium-6, this heading exclusively pertains to Helium-3. While all these are isotopes or compounds of isotopes, their elemental composition and specific isotopic enrichment differ significantly, leading to distinct physical, chemical, and technological properties. The other categories in 2845 focus on the isotopes of hydrogen and lithium, and boron, respectively, each with their unique set of applications and scientific significance.

As a leaf node within the HTS, there are no further subcategories for Helium-3. Therefore, the classification of Helium-3 under 2845.40.00.00 is definitive for this specific isotope. Any compounds or mixtures where Helium-3 is the principal component by weight or value would also fall under this classification, provided they meet the general provisions for isotopes and their compounds within Chapter 28. The emphasis remains on the presence and identification of the Helium-3 isotope itself.