18mm closures mate specifically with 18/400 GPI threaded neck profiles commonly found on narrow-neck liquid glass bottles. Aligning cap thread height and pitch with 18/400 glass finishes ensures an airtight seal that stops volatile liquid evaporation.

To cross-reference neck finish dimensions and liner material specifications before setting up liquid filling lines, check technical specification tables inside each product listing.

• PE-Lined Dome Caps: Smooth polyethylene foam backing designed for chemical resistance against liquid botanical extracts and tincture oils.
• Pressure Seal Caps: Torque-activated pressure sensitive liners that adhere directly to glass bottle rims upon initial closure application.

Yes, 18/400 child-resistant caps feature push-and-turn safety mechanisms to prevent accidental opening by children. Dual-motion locking mechanisms fulfill statutory state mandates for retail dispensary liquid sales.

Review state-specific liquid container compliance laws using our State Compliance Regulations Guide.

Inventory ships directly from our Sacramento warehouse so clients can access single units, standard split packs, or master wholesale cases without minimum constraints. Local warehouse stocking eliminates overseas factory lead times and keeps commercial filling lines operating continuously.