What are the differences between beer lid tinplate coated gaskets and composite gaskets (such as EVA based, butyl rubber based, etc.)?

What are the differences between beer lid tinplate coated gaskets and composite gaskets (such as EVA based, butyl rubber based, etc.)?

3.Tinplate coated gasket - high-end and specific applications

Composition: A special, elastic food grade coating (such as epoxy phenolic, vinyl, etc.) is directly coated on the inside of the metal cover, and then cured at high temperature to form a sealing layer.

Advantages:

Ultimate purity: completely avoids any migration or odor risks of gasket materials, and maximizes the preservation of the original flavor of beer. Known as the "flavor locking" technology.

Environmental Protection: Simple ingredients and easy metal recycling.

Beautiful: The bottle mouth is very clean after opening.

Disadvantages:

The highest cost: extremely high requirements for coating performance, coating process, and bottle mouth flatness.

Weak elastic repair ability: low tolerance for bottle mouth defects.

Current situation: Widely used in craft beer, high-end imported beer, and beverages that are extremely sensitive to flavor (such as some soda water). It is also common in beer that requires pasteurization because the coating has good high-temperature resistance.

4. Composite gaskets (such as EVA based, butyl rubber based, etc.)

Composition: Using EVA (ethylene vinyl acetate), butyl rubber and other elastic materials as substrates, and composite with other functional films.

Advantages: high elasticity, high sealing: especially butyl rubber, excellent air tightness. Good aging resistance and chemical resistance.

Current situation: Commonly used for products that require higher pressure resistance or longer shelf life, such as champagne, sparkling wine caps, and some specialty beers. The cost is higher than that of ordinary PE gaskets.

Technological development trends

1. PVC removal: This is the most clear global trend, with PE/PET and tinplate coating being mainstream alternative directions.

2. Lightweight and Thinning: Reduce plastic usage, lower costs, and enhance environmental friendliness while ensuring performance.

3. High performance coatings: Develop liquid coatings that are more flexible, have stronger adhesion, and are safer, promoting the popularization of coated gaskets.

4. Biobased materials: The industry has begun exploring the use of renewable biobased plastics (such as PLA modified materials) to make gaskets, but they have not yet been commercially available on a large scale.

For consumers, after opening the bottle cap, it is easy to distinguish: if there is a layer of white or colored (mostly red) soft plastic sheet inside the cap, it is usually a PVC or PE gasket; If there is a smooth and glossy coating on the inside of the cover and no separate gasket is visible, then it is a high-end coating.