As an experienced manufacturer based in Shantou, China, we have produced millions of custom spout for global clients.   A critical factor in spout design is selecting the right pouch size, which varies significantly based on the end product's application.

This guide introduces the specifications of the most common plastic spouts to help you make an informed choice for your packaging needs.

Understanding Spout Sizing: Inner Diameter (I.D.)

The key dimension for any spout is its Inner Diameter (I.D.).   Each spout has a nominal I.D. value, and our production maintains a tight tolerance of within ±0.1mm to ensure consistency and performance.

Generally, a larger spout diameter increases material usage and cost.   Therefore, selecting the appropriate size is crucial for both functionality and budget when planning your spout pouch project.

1.   The 8.6mm Spout: The Cost-Effective Standard

The 8.6mm spout is our most popular size, offering an excellent balance of efficient filling and cost-effectiveness.   It is ideal for a wide range of fluid products.

Primary Applications:

·         Juices and Milk

·         Liquid Colorants & Paints

·         Sauces (without granules, e.g., many soy sauces)

·         Tomato Ketchup

2. The 10mm Spout: For Enhanced Flow & Granules

The 10mm spout is designed to improve the user experience for thicker products or those containing small particulates. It provides a wider opening for easier pouring and filling.

Primary Applications:

·         Thicker Juices and Smoothies

·         Sauces with Granules (e.g., soybean sauce, chili sauce)

·         Liquid Food Products with fine inclusions

·         Non-Food Products requiring a less restrictive flow

3.13mm Spout: For Viscous Liquids

A versatile mid-size spout perfect for thicker, heavier-weight products.

Primary Applications:

·         Liquid Laundry Detergent

·         Liquid/Semi-Liquid Foods (e.g., honey, syrup)

4.16mm Spout: High-Volume Flow

Provides a large opening for rapid pouring of non-food and automotive products.

Primary Applications:

·         Liquid Laundry Detergent

·         Windshield Washer Fluids

·         Liquid/Semi-Liquid Foods (industrial size)

5.21.5mm Spout: Industrial & Heavy-Duty
Designed for high-flow requirements and very viscous liquids.

Primary Applications:

·         Liquid Laundry Detergent (bulk packaging)

·         Industrial Chemicals

6.22mm Spout: For Carbonated & Large Volumes

A robust spout size capable of handling larger volumes and pressure.

Primary Applications:

·        For Mustard sauce and cream

·         3~5L Beer Packages

·         Liquid Fertilizer

7.26mm Spout: Bulk Liquids
The go-to choice for very large volume water and agricultural packaging.

Primary Applications:

·         Liquid Fertilizer

·         5L Water Packages

8.33mm and 40mm Spout: Maximum Flow & Solids
The largest common size, designed for extremely high flow rates and even small solid objects.

Primary Applications:

·         5L+ Large Spout Packages

·         Cat Litter

·         Bulk Granular Products