Bottle & Closure Matching Guide
Matching a bottle and closure requires more than choosing the same nominal diameter. The neck finish, thread profile, closure style, liner, application torque, filling process and product formula should be evaluated as one packaging system.
Quick Matching Guide
| Bottle | Neck Finish | Matched Closure Option |
|---|---|---|
| 20ml PET Diffuser Refill Bottle | 18/410 | Matched 18/410 CRC cap |
| 120ml PET Diffuser Refill Bottle | 28/410 | Matched 28/410 CRC cap |
| 500ml Heavy-Wall PET Diffuser Refill Bottle | 28/410 | Matched 28/410 CRC cap |
| 1 Gallon HDPE Jug | 38-400 | Lined flat cap |
| 1 Gallon HDPE Jug | 38-410 | Push-turn cap or dispensing pump |
This table shows the closure options currently paired with the listed Unalilia products. It is not a universal compatibility chart for bottles or closures from other suppliers.
What Neck Finish Numbers Mean
Designations such as 18/410, 28/410, 38-400 and 38-410 identify the nominal neck diameter and a specific thread style. Both parts of the designation matter. A closure should be checked against the complete neck finish, not only the first number.
18/410 and 28/410 Diffuser Bottle Matching
Our 20ml PET diffuser bottle is paired with an 18/410 CRC cap. The 120ml and 500ml PET diffuser bottles are paired with 28/410 CRC caps. These closures are selected for the corresponding bottle models; always reconfirm the required bottle size, cap style and liner when requesting a quote or sample.
38-400 vs. 38-410
38-400 and 38-410 are different neck finishes and should not be treated as interchangeable. For our 1 gallon HDPE jug, the 38-400 version is offered with a lined flat cap, while the 38-410 version can be paired with a push-turn cap or dispensing pump. Select the jug neck finish according to the closure and dispensing method required for your project.
What to Confirm Before Ordering
- Complete neck finish and bottle thread profile
- Closure style and opening method
- Liner material and sealing surface
- Pump output and dip-tube length, when applicable
- Application torque and capping process
- Product formula and packaging compatibility
- Filled-package handling and shipping tests
- Required quantity, decoration and packing method
Compatibility and Testing
Matching neck-size numbers alone does not confirm sealing performance or formula compatibility. The bottle, closure, liner, torque, filling process and liquid formula should be tested together under the intended storage, handling and shipping conditions before production approval.
Request Matching Support
Send us your bottle size, required closure, product formula type, order quantity and destination. For a sample request, choose Standard Sample Request in the inquiry form.