Understanding CDL vs B64 Profiles: Choosing the Right Can Lid Design
A technical B2B engineering review comparing heavy-duty B64 can ends with material-saving CDL lightweight profiles for commercial high-speed beverage canning lines.
Written by: Christine Wong, Sales Director
|Published: July 7, 2026
|Company: Alucan Co., Ltd.
Quick Answer: The B64 profile is a traditional heavy-duty can end with a wide countersink radius and higher buckle ratings, while the CDL profile is a lightweight design that narrows the countersink wall to reduce aluminum use by about 10% while maintaining safe pressure limits. Choosing between them depends on carbonation level, filling temperature, seamer capability, and annual volume targets.
Primary Operational Difference Between B64 and CDL
The B64 and CDL profiles are two of the most widely specified aluminum beverage can ends in global B2B procurement. Both are designed for 202-diameter easy-open ends, but they diverge in shell geometry, metal thickness, and seaming behavior.
The B64 profile uses a wider countersink radius and a thicker shell. This geometry distributes internal pressure over a larger surface area, which raises the laboratory buckle rating and gives the end a stiffer feel. For decades it has been the default choice for carbonated soft drinks, energy drinks, and pasteurized beers that travel through hot-climate supply chains.
The CDL profile (Countersink Diameter Light) takes the opposite approach. It narrows the countersink wall and refines the curl geometry so the shell can be made from a lighter-gauge aluminum strip. The result is roughly a 10% reduction in metal consumption per end without dropping below accepted pressure safety limits. CDL is now common in standard 330 ml and 355 ml soft drink cans, water, and lower-carbonation beverages where material cost matters.
The practical implication is that B64 prioritizes absolute pressure safety, while CDL prioritizes material efficiency. Neither is universally better; the right choice is a function of product chemistry, carbonation, pasteurization requirements, and line speed. For a deeper side-by-side, see our B64 vs. CDL Easy Open Ends comparison.
Switching From B64 to CDL on the Same Canning Line
Switching profiles is possible, but it is not a drop-in replacement. Because CDL ends have a smaller countersink diameter and a thinner shell, the seamer must be recalibrated in three areas:
- Seaming chucks: The chuck profile must match the new countersink radius to avoid forming a loose first-operation seam.
- Seaming rolls: Roll groove clearances differ between B64 and CDL because the curl height and thickness are not identical.
- Pin height / lifter: The end feed pin and lifter plate must be adjusted so the thinner shell sits at the correct height in the seamer head.
After mechanical conversion, most engineers run a full validation batch: visual seam teardowns, burst testing, and micro-leak checks under line-speed conditions. If your plant runs both profiles on the same line, it is worth investing in quick-change seamer tooling to reduce changeover downtime. Alucan supplies sample kits and seaming-parameter sheets for customers transitioning from B64 to CDL on existing lines. Request a conversion kit quote to review the tooling map for your seamer model.
Engineering Comparison and End Sourcing Matrix
The table below summarizes the key engineering and procurement differences between the two profiles. Use it as a starting point for internal sourcing discussions.
| Attribute | B64 Profile | CDL Profile |
|---|---|---|
| Shell gauge | Standard / heavier | Reduced by ~10% |
| Countersink radius | Wider | Narrower |
| Typical buckle rating | 95–102 PSI | 90–95 PSI |
| Best for | High carbonation, pasteurization, hot climates | Standard carbonation, cost-sensitive SKUs |
| Line changeover | Baseline reference | Requires seamer recalibration |
| Annual savings at scale | Lower | Higher aluminum savings |
For buyers, the decision usually comes down to a break-even calculation: the unit aluminum savings of CDL multiplied by annual volume, minus any one-time seamer tooling and validation costs. Alucan's sales team can model this with your actual volume, can format, and destination market. Get a quote with your target SKU list and we will return a profile recommendation.
Internal Lining Configurations by Profile
The structural profile of the end does not dictate the internal lacquer system, but the two decisions are often made together. The end and the body must share the same lining chemistry to prevent corrosion at the double seam and to comply with regional food-contact regulations.
Epoxy-Phenolic linings remain common in high-volume industrial markets because of their proven chemical resistance and cost position. BPA-NI (BPA Non-Intent) coatings are required by many North American and European brand owners who want certified non-intent materials. Both systems can be applied to B64 and CDL ends; the choice is driven by product pH, shelf-life target, and customer specification, not by the profile geometry.
One subtle interaction: because CDL uses thinner aluminum, the coating weight per end is slightly lower, but the coverage ratio must still meet the same migration and corrosion targets. We discuss this relationship in more detail in our BPA-NI vs Epoxy can lining guide.
Premium Branding Customization on B64 and CDL Ends
Both profiles accept the same decoration processes: dry-offset printing on the shell, embossed logos, tab printing, and color-matched compound rings. However, because CDL shells are thinner, deep embossing or aggressive tab forming can create a slightly higher scrap risk if tool clearances are not optimized. B64's heavier gauge is more forgiving for aggressive branding features.
For most beverage brands, the visual difference between a B64 and a CDL end is indistinguishable to the consumer. The real customization value lies in consistent shell quality, stay-on-tab design, and anti-metal exposure features. Alucan's standard offering covers both profiles in 202, 206, and custom diameters with optional laser-etched batch codes and branded tabs.
Frequently Asked Questions
B64 is a heavy-duty profile with a wider countersink radius and higher material thickness, designed for maximum buckle resistance. CDL is a lightweight profile with a narrowed countersink wall that reduces aluminum use by about 10% while maintaining safe pressure limits for most beverages.
Yes, but the seamer must be recalibrated. Seaming chucks, seaming rolls, and pin heights must be adjusted to match CDL's distinct curl and countersink geometry. A validation batch with seam teardowns and burst tests is recommended before full production.
B64 ends typically offer the highest buckle rating, usually 95–102 PSI, making them preferred for highly carbonated, pasteurized, or hot-climate products. CDL ends achieve 90–95 PSI, which is sufficient for most soft drinks and beers.
Internal lining is independent of the structural profile. It should be chosen based on liquid chemistry and regional food-safety rules. Epoxy-Phenolic linings are common in industrial markets, while BPA-NI coatings are required by many North American and European brand owners.
CDL can be used for pasteurized beer if the pasteurization units and peak temperature stay within the end's pressure rating. For very high carbonation or aggressive tunnel pasteurization, B64 remains the safer engineering choice due to its higher buckle margin.
In most cases, no. The differences are in shell geometry and metal thickness, not in visible diameter or opening behavior. Both profiles accept the same printing, tabs, and embossing options.
Multiply the unit aluminum saving by your annual end volume, then subtract the one-time cost of seamer tooling, validation batches, and line downtime. At volumes above roughly 50 million ends per year, the material savings usually recover the conversion investment within one to two canning seasons.
Yes. Alucan manufactures aluminum cans and easy open ends in matching formats, including B64 and CDL profiles. We also provide seaming-parameter sheets and sample kits to support line qualification. Request specs and pricing here.
Request an Engineered Conversion Analysis
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