Pressure-Resistant DR9 High-Temper Electrolytic Tinplate 0.20mm for Ultra-Thin

DR9 (TH620) represents the pinnacle of double-reduced electrolytic tinplate hardness, engineered for the most demanding pressure-containing packaging applications in the aerosol industry. Manufactured through a precise double cold-reduction process followed by continuous annealing and temper rolling, this 0.20mm gauge ETP delivers yield strength exceeding 620 MPa while maintaining the formability required for complex dome and bottom geometries. The combination of ultra-high strength, minimal thickness, and consistent tin coating makes this material the definitive choice for aerosol component manufacturers pursuing lightweight construction, material cost reduction, and enhanced sustainability without compromising pressure vessel integrity.

• DR9 Ultra-High Hardness (TH620): Achieving a Rockwell 30T hardness of 76 minimum and yield strength exceeding 620 MPa through controlled double-reduction processing, this temper provides exceptional resistance to deformation under internal pressure. Aerosol can bodies manufactured from DR9 material withstand internal pressures up to 1.3 MPa at 50°C, meeting DOT and UN pressure vessel certification requirements.
• Down-Gauging Capability: The exceptional strength-to-thickness ratio allows manufacturers to reduce material gauge from conventional 0.24-0.28mm to 0.20mm while maintaining or exceeding pressure performance specifications. This 15-20% thickness reduction directly translates to material cost savings, reduced shipping weight, and improved carbon footprint metrics for finished aerosol products.
• Consistent Formability for Complex Geometries: Despite its high hardness level, the precisely controlled microstructure developed through continuous annealing provides sufficient residual ductility for forming complex aerosol dome profiles, expansion ring patterns, and curl geometries. The material consistently passes 100% of forming trials without cracking, necking, or coating damage.
• Excellent Surface Quality for Decorative Finishing: The bright surface finish provides an ideal substrate for lithographic printing, base coating, and over-varnishing of aerosol can exteriors. The smooth, defect-free surface produced by modern electrolytic tinning lines ensures consistent ink transfer and coating coverage, essential for brand-critical decorative packaging.
• Uniform Tin Coating Distribution: The electrolytic tin deposition process achieves coating weight uniformity within +/-0.2 g/m² across the full coil width. This consistency is critical for aerosol can interiors where localized thin spots in tin coating could lead to product-container interaction, corrosion, or pinhole formation over the product shelf life.
• Alloying and Intermetallic Control: The tinplate undergoes precisely controlled flow-brightening (reflow) to form a uniform iron-tin alloy (FeSn2) layer between the steel substrate and free tin layer. This intermetallic layer, maintained at 1.0-2.0 g/m², is essential for corrosion resistance and lacquer adhesion performance in aerosol can interiors.

This DR9 electrolytic tinplate is the material of choice for aerosol packaging manufacturers worldwide. Primary applications include three-piece aerosol can bodies for personal care products (deodorants, hair sprays, shaving foams), household products (air fresheners, cleaning sprays, aerosols), industrial aerosols (lubricants, paints, adhesives), and pharmaceutical metered-dose inhaler canisters. The material also serves the growing market for bag-on-valve (BOV) aerosol systems where precise internal pressure management is critical. Additionally, DR9 tinplate is specified for two-piece aerosol can bases and domes where its high strength allows for weight reduction while maintaining burst pressure ratings exceeding 1.5 MPa for safety-critical applications. The recyclability of steel aerosol packaging aligns with extended producer responsibility regulations and circular economy initiatives in all major markets.

DR9 tinplate coils are precision-packaged for international shipment with interleave tissue paper to prevent surface marking, VCI rust-inhibiting wrap, tempered hardboard edge protection rings, and high-tension steel banding on ISPM-15 compliant fumigated wooden pallets. Quality assurance protocols include continuous online tensile testing at coil extremities, full-width coating weight measurement by X-ray fluorescence or coulometric stripping, Erichsen cupping tests for formability assessment, accelerated corrosion testing (salt spray and cyclic humidity), and statistical process control with CpK targets exceeding 1.33 for all critical parameters. Each coil is identified with a unique heat/coil number for full traceability from steelmaking through finishing and shipment.