Product Overview

Bottle Plug is an inner plug sealing component designed for plastic bottles, glass bottles, food containers, and liquid packaging bottles. It is used for bottle neck plugging, leakage prevention, repeated opening, and transport protection, and can be customized by neck inner diameter, insertion depth, and pull-out structure.

Technical Specifications

Item	Parameter
Material	PE / LDPE / PP
Structure Type	Inner plug / flat plug / pull-ring plug / sealing plug
Application Range	Plastic bottles, glass bottles, food containers, liquid packaging bottles
Sealing Method	Plug-in seal, interference fit, sealing rib contact
Size Range	Fits bottle neck inner diameters approx. 8–55 mm
insertion depth	Approx. 5–35 mm, confirmed by bottle neck height
Product Weight	Approx. 1–15 g, confirmed by outer diameter and height
Color Options	White, natural, black, red, blue; customization supported
MOQ	100,000 pcs

Sealing and removal design

This plug-in seal is fitted into the bottle neck and seals through contact between its outer wall and the inner wall of the neck. The structure can be made with a pull ring, tab, flat head, or anti-slip edge for easier removal, depending on how the bottle will be opened and used. PE, LDPE, or PP can be selected to match the required sealing tightness and flexibility. It works with plastic bottles, glass bottles, oil bottles, and similar containers, and can be used together with outer caps, flip-top caps, or screw caps.

Applications

Plastic bottle inner plugs
Glass bottle sealing plugs
Edible oil bottle inner plugs
Condiment bottle plugs
Liquid containers
Outer cap combined seal matching

Custom size, material, and mold options

Plug diameter, height, insertion depth, sealing ribs, and pull-out design can be matched to the bottle neck inner diameter.
Flat plugs, pull-ring plugs, inner plugs, sealing plugs, or pourer-style plugs can be made for different opening and sealing needs.
Simple logos, marks, or symbols can be added on the top or outer side by embossing, debossing, or printing.
Colors include white, natural, black, or custom brand colors.
New molds can be made from bottle neck samples, sealing surface details, and insertion-force requirements.
Samples can be checked first for insertion tightness, sealing effect, and pull-out feel.

QC Process

Raw material inspection
Molding inspection
Dimensional sampling inspection
Insertion tightness inspection
Sealing contact surface inspection
Appearance sorting
Packaging inspection
Pre-shipment confirmation

Production Capacity & Lead Time

Monthly capacity is around 3,000,000 pcs. Standard products usually take about 30 days, while custom products take about 60 days. For new mold projects, the lead time depends on the structure, mold trial progress, and sample approval time.

Quality Control

Bottle plugs are produced and checked against approved samples, customer drawings, and outgoing inspection requirements before shipment. The main checks include material consistency, sealing size, insertion fit, burrs, surface appearance, and packaging condition. Third-party inspection is accepted, and production photos or videos can be provided during manufacturing.

Frequently Asked Questions

1. What size information is needed for bottle plug matching?

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It is recommended to provide bottle neck inner diameter, neck depth, sealing position, and bottle samples.

2. Can insertion tightness be adjusted?

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Yes. Insertion feel can be adjusted through outer diameter, sealing ribs, and material hardness.

3. Can a pull ring be added?

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Yes. Pull rings, tabs, or anti-slip structures can be designed for easier removal.

4. Can it be used together with an outer cap?

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Yes. The inner plug height and top shape can be confirmed according to the outer cap structure.

5. Is it suitable for liquid packaging?

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It can be used for food packaging containers, while material and testing requirements should be confirmed by project.