99mm Tomato Paste Can Bottom Ends: Specifications and Compatibility Guide
A 99mm tomato paste can bottom end is a metal closure designed for a can body with a compatible nominal end diameter and seaming profile. The “99mm” designation is a useful starting point, not proof that an end will fit a particular can. Buyers should confirm the can body dimensions, end profile, material, coating, sealing compound, and filling or processing conditions before approving production. This guide explains what to specify and what to verify when sourcing 99mm bottom ends from Wanhua or another supplier.
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Key Takeaways
- Use 99mm as the nominal size reference, then verify the can maker’s actual end and seam specifications.
- Compatibility depends on more than diameter: profile, metal, coating, compound, and seaming equipment all matter.
- Request a drawing, material and coating details, and samples for evaluation against your can body and process.
- Confirm pricing, MOQ, and lead time against the final specification rather than relying on the diameter alone.
Who This Guide Is For
This guide is for food-can manufacturers, tomato paste producers, packaging buyers, and importers evaluating 99mm can bottom ends. It is also useful when changing suppliers, launching a new can format, or investigating a sealing issue. If you already have a can-body drawing or an existing end sample, use it as the basis for technical discussion. The can maker or seaming-equipment provider should confirm final compatibility before a commercial order.
What a 99mm Can Bottom End Does
The bottom end closes one end of a metal can body and forms part of the package’s sealed structure. Its curl and other formed features must work with the can-body flange and the seaming operation to create the intended double seam. The end may also need to withstand handling, stacking, filling, and the product’s specified processing conditions. These requirements depend on the can design and production line, so they should be confirmed for each application.
Materials, Coatings, and Construction
Metal options
Can ends may be made from tinplate or other metal materials, depending on the product design and supplier offering. The appropriate choice depends on the required strength, forming characteristics, corrosion resistance, cost, and compatibility with the can body. Do not assume that an end material is interchangeable with an existing one simply because both are described as metal. Ask the supplier to identify the proposed substrate and confirm that it matches your packaging specification.
Internal coating and sealing compound
The internal coating helps protect the metal surface and must be selected with the product and processing conditions in mind. Tomato paste formulations and filling or heat-treatment processes can vary, so a coating suitable for one package should not automatically be assumed suitable for another. Confirm the coating type and its intended use with the supplier and your product-packaging team. Also verify the sealing compound specification and its suitability for the can-end design and seaming process.
Specifications to Confirm Before Ordering
A clear specification gives the supplier and buyer a shared reference for quotation, sampling, and production approval. Start with the nominal 99mm size, then document the features that determine whether the end will run correctly on your line. Values and tolerances should come from your can-body or end drawing, or be confirmed by the relevant technical parties. Avoid filling gaps with assumed industry-wide dimensions.
| Specification area | What to confirm | Why it matters |
|---|---|---|
| Nominal size | 99mm designation and the supplier’s dimensional drawing | Provides a starting point for matching the end to the can format. |
| Profile and curl | End profile, curl dimensions, and relevant tolerances in mm | These features interact with the can-body flange during seaming. |
| Material | Metal type, material specification, and thickness in mm | Affects forming and the end’s performance in the intended package. |
| Surface protection | Coating type, application side, and product suitability | Helps assess compatibility with the packed food and process. |
| Sealing compound | Compound details and compatibility with the end and seaming setup | Supports the intended sealing design and production evaluation. |
| Process requirements | Filling, closing, and any specified thermal processing conditions | Allows the supplier and can maker to assess the end in context. |
How to Check Compatibility
1. Match the end to the can body
Share the can-body drawing, flange information, and existing end specification where available. Compare the end profile and critical dimensions with the can maker’s requirements, not just the nominal diameter. If drawings are unavailable, provide a physical sample and ask the technical teams to establish the relevant dimensions. Record all dimensional values in mm and clarify the tolerances that apply.
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2. Evaluate the seaming setup
Ask whether the proposed end is intended for your can-body construction and seaming equipment. Seaming performance depends on the interaction of the end, body, tooling, and machine settings, so an end’s nominal size alone cannot demonstrate a sound seam. During a trial, have qualified production or quality personnel assess the seam using your established procedures. Do not treat a sample fit or visual inspection as a substitute for your normal seam verification.
3. Confirm coating and process suitability
Provide the supplier with relevant information about the tomato paste product and the packaging process. Confirm the required coating and compound with the supplier and your internal food-packaging or quality specialists. If the product is exposed to heat or other demanding conditions, make those conditions part of the technical review. Approve the end only after the relevant parties have evaluated it for the intended use.
4. Approve a representative sample
Request samples that represent the proposed material, profile, coating, and compound. A practical incoming check can include measurements at 4 evenly spaced points around the end, recorded in mm, where those measurements are relevant to your drawing and inspection plan. This is a suggested check method, not a universal acceptance standard; follow your own specification and agreed sampling plan. Keep the approved drawing and sample identification with the purchase documentation.
Selection and Sourcing Framework
When comparing offers, evaluate technical fit before comparing unit price. A quotation should make clear which material, thickness, coating, compound, dimensions, and packaging configuration it covers. If any of these are undecided, ask the supplier to list assumptions and identify items that require confirmation. This helps prevent a low initial quote from being compared against a differently specified product.
Pricing, MOQ, and lead time
Pricing and minimum order quantity can depend on the specification, order volume, tooling or setup requirements, packing method, and delivery destination. Lead time can also vary with material availability, production scheduling, sampling, and approval steps. Ask for these terms in writing against the same confirmed specification, and clarify whether sample approval or other milestones affect the schedule. Wanhua can review the requested configuration and discuss a quotation and supply plan after receiving the relevant technical details.
Supplier evaluation checklist
- Can the supplier provide a drawing with the critical dimensions and tolerances?
- Are the material, thickness, coating, and compound clearly identified?
- Can the supplier explain which can-body and seaming details are needed for a compatibility review?
- Are sample approval, quality documentation, packaging, MOQ, and lead time clearly described?
- Is there a defined process for communicating specification changes before production?
Common Buying Mistakes to Avoid
The most common mistake is treating “99mm” as a complete specification. A second is changing material, coating, or compound without reviewing the impact on the package and process. Buyers can also overlook the need to match the end profile to the can body and seaming setup. Finally, unclear drawings or undocumented sample approvals can make it difficult to resolve differences between the quoted product and the intended one.
Conclusion: What to Do Next
A 99mm tomato paste can bottom end is compatible only when its dimensions and construction suit the can body, seaming operation, product, and processing conditions. Start by sharing your can-body drawing or existing end sample, then confirm the profile, material, thickness, coating, compound, and applicable tolerances. Request a technically defined sample and evaluate it through your established quality and production procedures before placing a volume order. Contact Wanhua with your target specification, expected order quantity, and destination to discuss available options, sampling, pricing, MOQ, and lead time.