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Aerosol cans are a crucial component of aerosol products, serving as pressurized containers. Due to the convenience, ease of use, and storage benefits of aerosol packaging, an increasing number of products are adopting this form. Aerosol cans are widely used across various sectors including food, industrial, daily necessities, cosmetics, pharmaceuticals, and automotive care.

 

When opting for aerosol packaging for a product, careful consideration of the packaging container is essential. Key factors include the material (such as tinplate or aluminum), capacity (the required volume in milliliters), the type of propellant gas to be filled, and whether the formulation is corrosive to the can. These are critical considerations, and selecting the appropriate aerosol can must be based on the specific characteristics of the product itself.

 

Firstly, as a primary packaging container, the safety of an aerosol can is paramount, necessitating pressure resistance. Since the contents filled into aerosol cans are often chemical products, corresponding corrosion resistance is also required. Additionally, the can body must be compatible with the valve and plastic actuator, requiring good compatibility performance. The external appearance of the can represents the product on the shelf, making high-quality, aesthetically pleasing design and printing essential.

 

The primary indicator ensuring product safety is pressure resistance. This refers to the can's ability to withstand internal pressure. Pressure resistance is measured by two key metrics: Deformation Pressure and Burst Pressure.Deformation Pressure is the pressure at which the can undergoes permanent deformation when pressure is gradually increased inside it.Burst Pressure is the pressure at which the can ruptures after deformation, as internal pressure continues to be slowly increased.The National Standard "GB 13042-1998 Packaging Containers – Aerosol Cans" stipulates that the deformation pressure for aerosol cans should be ≥1.2 MPa and the burst pressure should be ≥1.4 MPa.

 

Comparative tests on the pressure resistance of tinplate and aluminum aerosol cans show that aluminum cans generally outperform tinplate cans in both deformation and burst pressure. In sealability and safety tests using a constant temperature water bath at 50°C to check pressure resistance, aluminum cans demonstrate superior performance. Although aluminum cans offer higher pressure resistance, their manufacturing process is more complex than that of tinplate cans, resulting in higher costs.

 

Corrosion resistance refers to the ability of the aerosol can's inner wall to resist erosion from its contents. Both tinplate and aluminum cans can be used with liquefied propellant gases like dimethyl ether. However, the internal coating on tinplate cans can be affected by different processing methods. Generally, the internal coating on aluminum cans is more robust and durable than that on tinplate cans. The transparent polyurethane coating used on aluminum cans offers excellent corrosion resistance.

 

For products with highly corrosive formulations, the bag-in-can (or binary packaging) option is available. This involves placing a separate pouch inside the standard tinplate or aluminum can. The product solution resides within the pouch, while the propellant occupies the space between the pouch and the can wall. This packaging method represents a newer, increasingly popular approach, widely used in the cosmetics and pharmaceutical industries for products such as sunscreen sprays and nasal saline sprays.

Tinplate packaging cans: a growing market trend

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