ZJ Pack 18-400 PP Slim Serum & Treatment Pump, 0.23cc Dosage with External Spring & Overcap

What this packaging is

Precision-dosed at 0.23cc per actuation, the 18-400 PP Slim Serum & Treatment Pump is built for cosmetic formulas where consistency matters. The external metal spring sits outside the pump body entirely, so it never contacts your liquid — a meaningful design detail for water-based serums, eye creams, foundations, and primers where metal contamination is a real concern. Constructed from polypropylene in a sleek all-black finish with a square outer shroud, it pairs with any 18-400 neck bottle and locks securely for transport via integrated clip lock. Optional electroplating, spray coating, and water transfer printing make differentiation easy for brands that want a custom look.

Why brands choose this

• External spring = zero metal-to-formula contact: The spring sits entirely outside the pump body, making this a strong fit for water-based, active, or sensitive formulations — face serums, eye creams, and treatment products where formula integrity is non-negotiable.
• Clip lock prevents accidental discharge in transit: Built-in clip lock secures the actuator during shipping and retail display, reducing waste and customer complaints — a practical detail that matters for brands selling through e-commerce or travel retail channels.
• Slim actuator designed for precision-dose categories: The 0.23cc output and slim actuator profile match the dispensing ritual consumers expect from serums and treatment products, supporting confident, controlled application and reducing over-dispensing — increasingly important as hero formulas carry higher price-per-ml.

Decoration