What are the key considerations for selecting raw materials for the manufacture of aerosol cans?

2026-07-09 11:07:13

A Spray can is the core carrier of pressure-sealed packaging, widely used in the fields of daily chemicals, chemicals, and medicine. Its quality, safety, and service life are entirely dependent on the selection of raw materials. The manufacturing raw materials of spray cans mainly include can body base materials, inner coating materials, valve accessory materials, etc. The selection of materials needs to take into account pressure safety, chemical compatibility, durability, cost, and environmental protection, in line with the storage and usage scenarios of the products.

The can body base material is the core of material selection. The mainstream materials are tin-plated iron and aluminum alloy, and the differences in their applicable scenarios are significant. The tin-plated iron material has high hardness, large tensile strength, excellent pressure performance, and a stable structure, suitable for packaging of high-pressure and heavy-load products such as industrial cleaning agents and foaming agents, and has low raw material costs, a stable supply chain, and extremely high cost-effectiveness for large-scale production. The aluminum alloy material is lightweight, has good one-piece forming performance, better sealing performance and appearance texture, and has excellent corrosion resistance. It can be adapted to medium and low-pressure products such as daily chemicals, cosmetics, and medicine without the need for complex coatings, while also reducing transportation costs due to its lightweight characteristics, but the cost is relatively higher. When selecting materials, it is necessary to precisely match the thickness and material type of the base material according to the pressure parameters inside the can and the product positioning.

The selection of inner coating materials directly determines the can body's corrosion resistance and compatibility with the contents. It is the key to ensuring the product's shelf life. The interior of the spray can needs to isolate the interaction between the base material and the contents to prevent chemical reactions. For water-based and weakly acidic daily chemical products, a conventional epoxy resin coating can be used; for industrial preparations containing solvents and strong corrosives, a modified high-temperature-resistant and solvent-resistant coating is required to prevent coating detachment, can rusting, and content deterioration. At the same time, the coating must comply with food and daily chemical safety standards, without harmful substances leaching, and be suitable for civilian product usage requirements.

The selection of plastic and metal accessories such as valves and nozzles cannot be ignored. Accessories need to have good sealing performance, weather resistance, and pressure resistance. The valve body mostly uses high-density polyethylene and polypropylene materials, which are strong in toughness and not prone to deformation, suitable for various environmental uses; metal accessories such as valve springs and gaskets need to be made of stainless steel and brass, resistant to rust and corrosion, ensuring precise opening and closing and tight sealing, avoiding leakage and liquid leakage problems over the long term.

In addition, material selection should also take into account economic and environmental aspects. Priority should be given to selecting compliant raw materials that are recyclable and easily degradable, in line with the green development trend of the industry. At the same time, all raw materials must undergo pressure tests and corrosion resistance tests to meet industry safety standards, and safety hazards such as explosion and leakage can be avoided from the source. Reasonable material selection is the core key to balancing the safety performance, usage experience, and production costs of spray cans.