{
  "summary": "HS code 3910.00 covers silicones in primary forms. It sits in heading 39.10 (silicones in primary forms) in chapter 39 (plastics and articles thereof). It is the only subheading of heading 39.10, so every good of the heading is classified here.",
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      "question": "What does HS code 3910.00 cover?",
      "answer": "HS code 3910.00 covers silicones in primary forms."
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        "Countries add their own digits after these six for their national tariff lines."
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        "This page was last updated on 13 October 2026.",
        "Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling."
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      "description": "Silicones in primary forms"
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