In the global cosmetic and pharmaceutical supply chain, the integrity of liquid packaging is a primary engineering concern. The 18/415 screw pump is a specialized dispensing component frequently used for high-end serums, essential oils, and lotions. However, long-distance shipping introduces variables such as air pressure fluctuations, vibration, and mechanical stress. Zhangjiagang XinYe Chemical Sprayer Co., Ltd., founded in 2006, operates across 100,000 square meters of production space with full-auto production and inspection equipment to solve these challenges. With ISO9001-2008 certification and a dedicated team of 100 quality and technology staff, we ensure that every pump provides a hermetic seal from our factory to the end consumer.
The first line of defense against leakage is the mechanical interface between the pump and the bottle. A critical technical question is: What is the standard neck finish for an 18/415 screw pump? The "18" refers to the nominal diameter in millimeters, and "415" refers to the specific thread height and configuration. At XinYe, our injection moulding and aluminum stamping processes are precision-calibrated to ensure that the thread pitch matches international standards perfectly. If the thread engagement is insufficient, the pump may tilt under vibration, breaking the seal.
While standard 410 finishes are shorter, the 415 finish provides additional thread turns, which significantly increases the friction-lock and reduces the risk of loosening during sea or air freight.
| Technical Feature | 18/415 Screw Pump Design | Standard 18/410 Pump Design |
| Thread Height | Tall (approx. 22.5mm neck height) | Standard (approx. 17.5mm neck height) |
| Mechanical Stability | Higher (More thread contact area) | Moderate |
| Vibration Resistance | Superior for long-haul shipping | Basic |
A leak-proof seal relies on the gasket being compressed uniformly against the bottle rim. Manufacturers often ask: What is the best gasket material for 18/415 lotion pumps? Engineers must select between PE foam, EVA, or silicone gaskets based on the chemical viscosity of the product. Zhangjiagang XinYe Chemical Sprayer Co., Ltd. utilizes full-auto inspection equipment to verify the "rebound rate" of gaskets, ensuring they do not take a permanent set during the temperature swings found in shipping containers.
Compared to low-density PE liners, high-density closed-cell gaskets provide a much better compression recovery, which is vital for preventing leakage in 18/415 dispensers during air transport where cabin pressure drops can cause liquid expansion.
| Material Property | High-Density PE/Silicone Gasket | Standard Low-Density Foam |
| Compression Set | Low (Maintains seal after pressure) | High (May flatten and leak) |
| Chemical Resistance | Excellent (Oil and Alcohol resistant) | Moderate |
| Vacuum Performance | Airtight at high altitudes | Prone to micro-leaks |
The "Lock-Down" or "Screw-Down" feature is the secondary sealing mechanism for the pump head itself. A frequent query for engineers is how to calibrate torque for 18/415 screw pump installation. Excessive torque can strip the threads or crack the aluminum shell (oxidized at our specialized surface treatment facility), while insufficient torque leads to cap back-off. Zhangjiagang XinYe utilizes automated assembly lines to ensure that the internal spring tension and the screw-down threads are perfectly synchronized, preventing the "pop-up" of the pump head during transit.
In air freight, the differential between internal bottle pressure and external cabin pressure can force liquid up the dip tube. One must understand why 18/415 screw pumps need vacuum testing. At our Zhangjiagang headquarters, we conduct rigorous vacuum leak tests. The 18/415 screw pump must allow for atmospheric venting during normal use, but it must remain sealed when the pump is in the "locked" position. Our advanced design features a specific venting hole that is mechanically blocked when the pump head is screwed down, a critical feature for 18/415 screw pump chemical compatibility and sealing.
Yes. The 18/415 screw pump is engineered with a robust spring and large-diameter internal piston, making it ideal for lotions and creams that require higher suction force.
No. While the oxidation provides a premium look, the aluminum stamping adds structural reinforcement to the plastic core, helping the 18/415 screw pump resist cracking during over-torquing on assembly lines.
Compatibility depends on the gasket and internal valve materials. Zhangjiagang XinYe offers specialized material options for 18/415 screw pump chemical compatibility and sealing to ensure no degradation occurs with essential oils.
With three production bases covering 100,000 square meters and over 600 employees, we maintain high capacity for wholesale 18/415 screw pump suppliers with efficient delivery through nearby expressways and the Yangtze waterway.
Ensuring the correct application torque and using a 415 neck finish (which has more thread engagement than 410) are the best ways to prevent the pump from loosening during ground transportation.
Tel: +86-13812990918
Phone: +86-512-58962260
Address: No.3, Xiangqun Road, Leyu, Zhangjiagang.
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