307# 83.3mm Tin Bottom End Normal Open End for Food Cans

Standard 307# (83.3mm) Round Tinplate Bottom End for Reliable Food Can Sealing—Complete your food packaging setup with our premium 307# round tinplate bottom ends (also known as standard or sanitary bottom ends). Designed for standard food containers with an 83.3mm outer diameter, these high-quality metal ends are ideal for automated canning lines, providing a robust, permanent, and airtight barrier that locks in freshness and prevents structural deformation. Compatible with both easy-open ends and matching sanitary ends, they are widely used in the commercial processing and packaging of meats, beans, soups, ready-to-eat meals, fruits, and vegetables. Each end features precision-stamped concentric expansion rings to withstand the intense pressure fluctuations that occur during post-filling heat treatment.

Key Product Features

• Concentric Expansion Ring Design: Features specially engineered annular ribs that allow the metal to deform safely during thermal expansion and contraction caused by internal pressure, preventing buckling or leakage during high-pressure cycles.

• Perfect Double-Seam Geometry: Manufactured with optimized seam radii and strict thickness tolerances, ensuring seamless compatibility with automatic double-seaming equipment for a 100% airtight and reliable bottom seal.

• Multiple Coating Options: Available with classic silver or premium gold internal coatings. These food-grade protective coatings form a robust barrier, effectively preventing chemical reactions caused by high-salt, high-oil, or acidic food ingredients.

• Superior High-Temperature Sterilization Performance: Engineered for rigorous food preservation processes, maintaining structural integrity and a tight seal during standard commercial hot-filling and sterilization procedures. Technical Specifications

• Model Designation: 307# (Industry standard outer diameter: 83.3mm)

• Structure Type: Round / Standard Bottom End (Sanitary-grade end)

• Base Material: High-quality Electrolytic Tinplate (ETP)

• Color & Finish: Standard silver (plain) or gold coating options available

• Primary Applications: Bottom end components for canned fish, meat, vegetables, fruits, pet food, and dry powders

• Mechanical Properties: Nominal thickness 0.25mm | Vacuum/Internal pressure tolerance: 0.1 MPa | Compatible with high-temperature sterilization (retorting) processes

• Industrial-scale customization and bulk wholesale available

We provide precision-manufactured, high-volume metal packaging components tailored to your factory's specifications:

• Specialized Protective Coatings: Customizable internal coatings (e.g., organosol, epoxy-phenolic, or aluminum-pigmented coatings) to address specific product characteristics, such as sulfide staining or filiform corrosion in high-acidity environments.

• Thickness & Hardness Calibration: Tinplate thickness and hardness grades can be flexibly adjusted based on specific requirements for can height and structural stacking strength.

FAQ

Q1: What are the main structural differences between a 307# easy-open end and this 307# bottom end?

A: Easy-open ends feature pre-scored tear lines and an integrated pull-tab, allowing consumers to open the can without tools. In contrast, this 307# bottom end is a solid, un-scored sanitary metal end designed to be permanently attached to the can body via a double-seaming process at the packaging plant, providing a robust, airtight seal.

Q2: Can this 83.3mm bottom end withstand high-temperature sterilization (retorting)?

A: Yes, absolutely. These sanitary-grade ends are specifically engineered to withstand rigorous industrial high-pressure sterilization processes (such as steam sterilization at temperatures up to 121°C). Its stamped expansion ring is specially designed to absorb the pressure generated by the thermal expansion of the food contents while ensuring the integrity of the double-seam structure. Contact us for details.