30mm and 38mm Aluminum Bottle Caps

In the packaging industry, ROPP aluminum caps have become the preferred choice for food, beverage, and pharmaceutical products due to their excellent safety and practicality. The 30mm and 38mm caps, in particular, stand out.

Market Landscape

The 30mm aluminum cap, with its compact size, has become the standard for small- to medium-capacity packaging. Data shows that in the mainstream 200-500ml packaging sizes, the market penetration rate of 30mm aluminum caps exceeds 65%, especially for bottled water, juice, and oral liquids, where they are almost the default choice.

This widespread adoption is due to the large-scale production in the food and beverage industry—approximately 200 billion bottles of bottled water are consumed globally each year, with nearly 70% using 30mm ROPP aluminum caps, making it the highest-volume single-size aluminum cap product.

The 38mm ROPP aluminum cap targets the "high-end, large-capacity" market, dominating the 1-2L packaging and premium beverage sectors. With the booming sales of large-sized family-sized bottles, the market demand for 38mm aluminum caps is growing at an average annual rate of 9.2%. In categories such as beer, wine, and cooking oil, its market share has increased from 18% in 2023 to 25% in 2025.

Especially in the high-end spirits market in North America and Europe, 38mm aluminum caps, due to their ability to support complex printing and anti-counterfeiting designs, have become an important vehicle for brands to showcase quality. Leading beverage companies now procure over 80% of their products using customized 38mm aluminum caps.

Core Advantages

First and foremost is the superior tamper-proof and airtight seal. Simultaneously, the EPE liner inside the aluminum cap effectively blocks air and moisture, extending shelf life to 18 months, far exceeding that of plastic cap packaging.

A balance between lightweight and durability is another major highlight. A single 30mm aluminum cap weighs less than 1g, and one ton of aluminum can produce over 1 million units, significantly reducing transportation costs.

Its environmentally friendly attributes align with current market trends. Aluminum ROPP caps are 100% recyclable, and the energy consumption for producing recycled aluminum is only 5% of that for virgin aluminum. Furthermore, their customization potential meets brand marketing needs. Both sizes support six-color printing, hot stamping, embossing, and other processes.

Application Scenarios

The 38mm aluminum ROPP caps primarily targets small-to-medium capacity fast-moving consumer goods. In the food and beverage sector, it's the perfect partner for 330ml canned beer; in the pharmaceutical sector, the 30mm aluminum cap, with its added tear-off tamper-evident ring, has become standard on children's medicine bottles, effectively reducing the risk of accidental ingestion; even in the cosmetics sector, the 30mm aluminum cap, with its elegant appearance, is a common sealing solution for 50ml serums and 100ml toners.

The 38mm ROPP aluminum cap focuses on large-capacity and high-end scenarios. In the household consumer market, 1.5L bottles of soy sauce and vinegar, and 2L bottles of carbonated beverages almost all use 38mm aluminum caps. This specification features a thicker thread design, maintaining a tight seal even after repeated unscrewing, meeting the needs of multiple household uses. In the high-end beverage sector, the 38mm aluminum cap is standard for spirits such as whiskey and brandy.

In the chemical industry, the 38mm aluminum cap, due to its strong corrosion resistance, is used in 500ml bottles of household cleaning products. In the health supplement sector, the 30mm aluminum cap, paired with pharmaceutical-grade butyl rubber stoppers, is the preferred choice for fish oil and vitamin E softgel bottles, ensuring that the active ingredients do not oxidize within the product's shelf life.

Original source: https://www.alubottlecaps.com/a/30mm-and-38mm-aluminum-bottle-caps.html

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