China opens consultation on tighter anti-tamper bottle cap standard

China's national standards body has published a draft revision of GB/T 17876, the standard for plastic tamper-evident bottle caps, introducing a quantified limit on the gap between seal failure and tamper-ring breakage. The move follows a consumer incident in April 2026 in which some caps leaked liquid before the tamper ring broke, and sets a maximum angle difference (B-L) of 40 degrees for non-carbonated caps, with industry sources saying some producers already achieve tighter margins.

Why this mattersA tighter national safety standard for tamper-evident closures could force cap redesigns and added inspection costs across China's bottled beverage and dairy supply chain.

• Draft revision of GB/T 17876 sets a maximum B-L angle of 40 degrees for non-carbonated caps, limiting the gap between seal failure (L) and tamper-ring breakage (B)
• The incident prompting the review occurred in April 2026, when caps were shown to leak liquid before the tamper ring visibly broke
• The prior 2010 version of the standard regulated sealing performance and tamper-evidence separately without defining their sequence
• Industry sources say some products on the market already achieve B-L of minus 50 degrees or better, meaning the tamper ring breaks well before the seal fails
• A fully protective standard would require B-L of 0 degrees or less, so the tamper ring breaks at or before seal failure
• The draft revision is open for public consultation

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