18/415 Black Smooth Double Wall Treatment Pump

1: Product Overview

Welcome to our high-performance 18/415 black smooth double wall treatment pump product page.Engineered specifically for cosmetic bottles with an 18mm neck finish, this treatment pump combines a modern minimalist look with industrial-grade mechanical stability. The double-wall outer collar creates a seamless, flush transition between the pump and your bottle shoulder, delivering a luxury aesthetic without the high cost of metal components.

2: Detailed Technical Specifications

• Neck Size: Standard 18/415 (18mm diameter, 415 thread finish standard).

 • Closure Style: Double wall outer collar, smooth glossy finish (non-ribbed).

 • Standard Color: Deep glossy black (custom Pantone colors available upon request).

 • Discharge / Dosage Rate: 0.20 cc per stroke (uniform output).

 • Actuator Material: Food-grade and cosmetic-grade Polypropylene (PP).

 • Closure / Collar Material: Sturdy PP inner core with smooth double-wall outer shell.

 • Gasket / Liner: High-elasticity LDPE / PE gasket for airtight vacuum sealing.

 • Internal Spring: SUS304 / SUS316 stainless steel, high-resilience, corrosion-proof.

 • Dip Tube: Translucent PE plastic, customized length with clean V-cut or flat bottom.

 • Overcap Options: AS Full Clear Overcap or PP Protective Mini Cap.

3.Actual Product Photos:

4: Recommended Applications & Formula Compatibility

The 18/415 specification is one of the most widely used neck finishes in the global cosmetics, dermatology, and personal care markets. This pump is fully tested and recommended for:

 • Face Serums & Essences: Vitamin C serums, Hyaluronic Acid liquids, Niacinamide solutions, and peptide formulas.

 • Eye Treatments: Eye contour gels, dark circle creams, and targeted eye repair fluids.

 • Liquid Foundation & BB/CC Creams: Smooth dispensing for viscous cosmetic color formulations without pigment separation.

 • Lightweight Face & Body Lotions: Daily hydrating emulsions, soothing aloe gels, and non-greasy day creams.

 • Hair & Scalp Oils: Concentrated hair serums, argan oil blends, and scalp treatments requiring precise droplet dosing.

 Formula Compatibility Note: While our medical-grade PP and SUS304 springs resist most cosmetic ingredients, we strongly advise customers to conduct standard 48-hour oven and vacuum stability testing with their actual bulk liquid before full production.

5: Frequently Asked Questions (FAQ)

Q1: Can this 18/415 pump fit on glass bottles from different suppliers?

 A1: Yes. As long as your glass bottle, PET bottle, or HDPE bottle follows standard 18/415 (GPI/SPI 18mm neck finish) specifications, our pump will thread smoothly and lock tightly. If you have custom bottles, feel free to send us sample bottles, and our engineering lab will test the closure fit and trim the dip tube for you.

 Q2: What is the main difference between an AS full overcap and a PP mini cap?

 A2: The AS full overcap covers the pump collar entirely down to the bottle shoulder, providing a high-gloss, crystal-clear luxury appearance suited for retail prestige skincare. The PP mini cap covers only the dispensing nozzle, making it compact, highly durable, and cost-effective for travel sizes or lighter packages.

 Q3: Does the pump mechanism leak if shipped by air express?

 A3: No. Our pumps pass strict vacuum chamber testing at -0.08 MPa for 15 minutes. The internal check ball, spring mechanism, and PE neck gasket prevent internal pressure expansion from pushing cosmetic formula through the nozzle during high-altitude air transit.

 Q4: Can we order free samples before placing a bulk order?

 A4: Yes, we provide free stock samples (3–5 pieces) in black or natural colors for testing with your actual bottles and bulk liquids. Contact our sales team with your international courier account (DHL, FedEx, or UPS), and we will ship them within 2 business days.