How to Choose the Right Bottle Neck Size, Pump Head, and Closure for Your Product

Choosing the right packaging components isn’t just about aesthetics — it directly impacts product compatibility, user experience, and leak prevention. At Keyuan Bottle, we specialize in custom PET, HDPE, and PP bottles, and we understand how important it is to match the right bottle neck size, pump head, and closure system to your formulation.

Understanding Bottle Neck Sizes (Neck Finish)

The bottle neck size, also known as the neck finish, refers to the diameter and thread type of the bottle opening. It’s essential for ensuring that caps, pumps, or sprayers fit securely and function properly.

Most common neck sizes on the market:

20/410, 24/410, 28/410 – for spray pumps, disc caps, and flip-tops

33/400, 38/400 – for larger pump bottles and jars

18/415 – for serum pumps and essential oil droppers

Keyuan Bottle offers:

24/410 PET round bottles

28/410 HDPE lotion pump bottles

Custom neck sizes and threaded molds for large-volume clients

Tip: Always test pump compatibility with the exact neck finish before mass production to prevent leakage or malfunction.

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Selecting the Right Pump Head or Sprayer

Different formulations require different dispensing methods. For example, thin liquids like toner or mist require a fine spray, while viscous products like lotion need a strong pump head.

Mist Sprayers – Ideal for toners, alcohol sprays, facial mist

Lotion Pumps – Suitable for lotions, shampoo, conditioner

Foam Pumps – For hand soaps, mousse cleansers

Airless Pumps – High-end skincare, serums, oxidation-sensitive formulas

Keyuan’s Pump Selection:

PP Fine Mist Sprayers for PET bottles

Lotion Pump Heads with multiple output volumes

Airless Pump Bottles to extend shelf life and minimize contamination

Tip: Match pump output (e.g., 0.2ml, 0.5ml, 2ml) to the product viscosity and desired user dose.

Choosing the Right Cap or Closure

Even with a perfectly sized bottle and pump, your product needs a secure closure to prevent leaks during shipping or display.

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Types of closures Keyuan provides:

Screw Caps – Standard sealing for serums, oils

Flip-Top Caps – One-handed use for cleansers or shampoo

Disc-Top Caps – Sleek design for lotions or conditioners

Child-Resistant Caps – For pharmaceuticals or oils

Tamper-Evident Closures – Ensure product safety during transit

Many of our closures are made with recyclable PP and can be color-matched or printed with your logo.

Tip: Always pressure-test your selected closure with your formula, especially for alcohol-based or essential oil products.

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Compatibility and Functionality Testing

Before finalizing packaging, we recommend testing:

Pump actuation force – Does it suit your product thickness?

Neck tightness and seal integrity – Especially for transport

Chemical compatibility – Avoid stress-cracking or discoloration

At Keyuan, we offer free samples and small-batch trial orders to help you test packaging before committing to large-scale production.

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Sustainability Considerations

Modern buyers are increasingly eco-conscious. Matching the right bottle and closure not only reduces waste but supports sustainability.

Choose mono-material bottles and caps (e.g., full PP or PET) for easy recycling

Opt for refillable airless pump systems

Ask about our GRS-certified recyclable material options

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