Sulfur-Resistant ETP Tinplate Sheets And Coils For Fish & Seafood Packaging Tuna Cans
Premium ETP tinplate for tuna cans. Designed for protein-rich and oily seafood with sulfur resistance, excellent coating adhesion, and long shelf life performance.
Tuna and seafood products present unique packaging challenges due to their high protein content, natural oils, and sulfur compounds, which can react with metal surfaces and cause discoloration or corrosion.
ETP Tinplate (Electrolytic Tinplate) is widely used in tuna cans because it provides a strong structural base and excellent compatibility with specialized internal coatings.
We supply high-quality tinplate sheet and coil for tuna cans, engineered to ensure corrosion resistance, coating adhesion, and stable performance during sterilization and long-term storage.
Typical specifications for tuna cans:
Thickness: 0.18–0.32 mm
Tin coating: 2.8/2.8 – 5.6/5.6 g/m²
| Temper | ||||
| Standard | Japanese Standard | Chiness Standard | European Standard | American Standard |
| JIS3303-2002 | GB/T2520-2000 | DIN EN 10203-1991 | ASTM623M-2002 | |
| Single-Reduced | T1 | TH50+SE | TS230 | T1(T49) |
| T2 | TH52+SE | TS245 | T1(T53) | |
| T2.5 | TH55+SE | TS260 | T2.5(T55) | |
| T3 | TH57+SE | TS275 | T3(T57) | |
| T4 | TH61+SE | TH415 | T4(T61) | |
| T5 | TH65+SE | TH435 | T5(T65) | |
| Double-Reduced | DR7 | H71+SE | TH520 | DR7 (T71) |
| DR8 | H73+SE | TH550 | DR8(T73) | |
| DR9 | H76+SE | TH620 | DR9(T76) | |
| Temper Grade | Hardness (HR30Tm) | Yield Strength (MPa) |
|---|---|---|
| T-1 | 49±3 | 330 |
| T-2 | 53±3 | 350 |
| T-3 | 57±3 | 370 |
| T-4 | 61±3 | 415 |
| T-5 | 65±3 | 450 |
| DR-7M | 71±5 | 520 |
| DR-8 | 73±5 | 550 |
| DR-8M | 73±5 | 580 |
| DR-9 | 76±5 | 620 |
| DR-9M | 77±5 | 660 |
| DR-10 | 80±5 | 690 |
| Former Coating Designation | ||
|---|---|---|
| Former Coating Designation | Nominal Coating Weight (g/m²) | Minimum Average Coating Weight (g/m²) |
| 10# | 1.1/1.1 | 0.9/0.9 |
| 20# | 2.2/2.2 | 1.8/1.8 |
| 25# | 2.8/2.8 | 2.5/2.5 |
| 50# | 5.6/5.6 | 5.2/5.2 |
| 75# | 8.4/8.4 | 7.8/7.8 |
| 100# | 11.2/11.2 | 10.1/10.1 |
| 25#/10# | 2.8/1.1 | 2.5/0.9 |
| 50#/10# | 5.6/1.1 | 5.2/0.9 |
| 75#/25# | 5.6/2.8 | 5.2/2.5 |
| 75#/50# | 8.4/2.8 | 7.8/2.5 |
| 75#/50# | 8.4/5.6 | 7.8/5.2 |
| 100#/25# | 11.2/2.8 | 10.1/2.5 |
| 100#/50# | 11.2/5.6 | 10.1/5.2 |
| 100#/75# | 11.2/8.4 | 10.1/7.8 |
| 125#/50# | 15.1/5.6 | 13.9/5.2 |
| Surface Finish | ||
|---|---|---|
| Classification | Symbol | Specific Feature |
| Bright Finish | B | A luster finish provided by a flow-melted tin coating on a smoothly finished steel based with grindstone-pattern. |
| Stone Finish | R | A luster finish provided by a flow-melted tin coating on a steel base characterized by a directional grindstone-pattern. |
| Silver Finish | S | A luster finish provided by a flow-melted tin coating on a coarse dull-finished steel base. |
| Matte Finish | M | A dull finish usually provided by an unflow-melted tin coating on a dull finished steel base. |
Sulfur Resistance for Seafood Packaging
Fish products release sulfur compounds during processing and storage, which may cause blackening (sulfide staining). Tinplate combined with proper internal lacquer effectively prevents this reaction.
Excellent Compatibility with Specialized Coatings
ETP tinplate supports high-performance coatings such as:
- Epoxy phenolic lacquer
- Sulfur-resistant internal coatings
- BPA-NI food-grade coatings
These coatings create a stable barrier between seafood and metal.
Resistance to Oil & Protein Interaction
- Handles oily environments without degradation
- Prevents flavor contamination
- Maintains product freshness
Stable Forming & Heat Processing Performance
- Suitable for deep drawing and can shaping
- Withstands sterilization (retort process)
- Reliable double seaming for leak-proof cans
Seafood Packaging
- Tuna cans
- Sardine and mackerel cans
- Processed seafood containers
Food Packaging
- Protein-rich canned foods
- Oil-based food products
Can Components
- Can bodies
- Easy-open ends (EOE)
- Lids and closures
Q1: Why is sulfur resistance important for tuna cans?
A: Fish releases sulfur compounds that can react with metal, causing discoloration. Proper coating prevents this.
Q2: What coating system is recommended?
A: Epoxy phenolic or sulfur-resistant lacquer is commonly used.
Q3: What tin coating weight is suitable?
A: 2.8/2.8 to 5.6/5.6 g/m² depending on storage conditions.
Q4: Can it withstand sterilization processes?
A: Yes, it is designed for retort processing in canned seafood production.
Q5: Do you support customized specifications?
A: Yes, thickness, coating, and surface finish can be tailored.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.