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How Many Ml Is In a Bottle Cap
Aug 19, 2025 11:04:43
When it comes to bottle caps, most people focus solely on whether they screw tight and prevent leaks, but rarely consider their hidden "capacity properties." In reality, a bottle cap's capacity isn't randomly set; it's a key design decision deeply tied to the bottle's capacity and usage scenario.
How many ml in a bottle cap
It isn't entirely determined by size, but size is a key influencing factor. Common plastic screw caps typically have a capacity between 2 and 15 ml. This seemingly narrow range actually covers a wide range of applications, from 50 ml bottles to 2 liter bottles.
Generally speaking, bottle cap design follows the principle of "small bottles with small-capacity caps, large bottles with large-capacity caps." For example, 50-100 ml sample bottles and oral liquid bottles are paired with 18-24 mm caps, typically with a capacity of 2-3 ml. This prevents uncontrolled pouring and reduces exposure of the contents to air. Meanwhile, 1-2 liter household beverage bottles and laundry detergent bottles often have caps with a capacity of 10-15 ml, allowing for a full amount of liquid to be poured out at once without refilling.
32mm screw cap
32mm cap is a standard size in the food and daily chemical industries. Its corresponding cap capacity typically ranges from 5-8ml, and its compatible bottles range from 200-500ml. This combination is ubiquitous in everyday life.
In terms of usage, 200ml juice bottles, 300ml sauce bottles, and 500ml shampoo bottles mostly opt for 32mm screw caps. For example, with 500ml of shampoo, the average usage is approximately 5ml. A 32mm cap is just the right amount for a single use, eliminating the need for repeated measurement and preventing waste due to the wide mouth opening. For a 200ml juice bottle, a 5-8ml cap is sufficient for a single sip while preventing contamination of the remaining juice after opening.
From a design perspective, the thread density and sealing rubber thickness of the 32mm bottle cap are well-suited for small and medium-sized bottles. These bottles are often handheld, and the 32mm cap diameter is ergonomic, requiring minimal force when unscrewing. Furthermore, the 5-8ml capacity balances portability and practicality, neither increasing the overall size of the bottle due to an oversized cap nor compromising the user experience due to a smaller capacity.
38mm screw cap
Slightly larger than the 32mm, the 38mm bottle cap typically holds 8-12ml and is primarily suitable for large-capacity bottles of 1-2 liters, such as household laundry detergent, kitchen cleaner, and large beverage bottles.
Taking a 1.5-liter bottle of laundry detergent as an example, 10-15 ml of detergent is dispensed per load. The 8-12 ml capacity of a 38mm bottle cap is close to the single-use amount, allowing users to dispense only once or refill slightly, eliminating the need for frequent refilling. For a large 2-liter bottle of cola, a cap of around 10 ml also allows for sharing between multiple people, avoiding the unhygienic issue of drinking directly from the bottle mouth.
From a structural design perspective, the 38mm cap offers enhanced load-bearing capacity and leak-proof performance. Large-capacity bottles weigh heavily when filled with liquid, and the 38mm cap diameter helps distribute pressure across the bottle neck, reducing deformation caused by the liquid's weight. Furthermore, since bottles with capacities between 8 and 12 ml require a wider neck, the 38mm diameter allows for faster liquid flow, avoiding the "stifling" of liquid during pouring caused by a narrow neck, thus improving efficiency.
Original source: https://www.alubottlecaps.com/a/how-many-ml-is-in-a-bottle-cap.html
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