Frequently asked questions

An airtight waterproof zipper stops water, air and moisture entering or escaping through an opening. It suits products that need an openable sealed port: military equipment, waterproof equipment, sealed bags and luggage, protective suits, diving gear, inflatable products and industrial high-speed doors. YILON can customise length from 5 cm to 100 m, plus size, tape width, colour, slider, opening style, material and testing requirements.

YILON airtight waterproof zippers can be used in military equipment, waterproof equipment, sealed bags and luggage, protective suits, diving gear, industrial high-speed doors, cleanroom doors, cold chain door curtains, chemical protective suits and medical isolation equipment.

YILON currently covers 9 main product ranges: #10 resin airtight zipper, #5 resin airtight zipper, self-healing airtight zipper, PEVA airtight zipper, #5 nylon woven waterproof zipper, #8 nylon woven waterproof zipper, high-speed roller door zipper, circular airtight zipper and drysuit envelope. The #10 resin, #5 resin, self-healing, high-speed roller door and circular ranges are published with 3,000+ cycle durability.

Related series:#10 Resin#5 ResinSelf-HealingPEVA#5 Nylon#8 NylonRoller DoorCircularDrysuit Envelope

A self-healing airtight zipper keeps a high-sealing airtight structure while adding automatic recovery: if the chain derails, it resets itself and can carry on being used. It suits inflatable products, rescue equipment and other applications where reliability matters most.

Related series:Self-Healing

A circular airtight zipper achieves 360-degree all-round sealing through a circular closure. It is used in closed-loop sealing structures for military equipment, waterproof equipment, sealed bags and luggage and protective suits, as well as tent and cover openings, medical isolation chambers and flexible storage containers.

Related series:Circular

A high-speed roller door zipper is the core sealing and load-bearing component of a zipper-type high-speed door. It supports frequent, rapid open/close cycles and is used in cleanrooms, cold chain logistics, industrial manufacturing partitions and commercial public areas.

Related series:Roller Door

An ordinary waterproof zipper is mainly for rain and splash resistance. A watertight zipper reduces water ingress. An airtight zipper additionally has to control air leakage and carry a pressure seal. Real selection depends on immersion, flexing, pressure, how often it is opened, temperature and the working environment.

#5 suits lightweight and flexible products, #8 suits medium-to-high strength waterproof equipment, and #10 suits heavy-duty, pressure-resistant and industrial sealing projects. The resin, nylon woven, self-healing and circular ranges address military equipment, waterproof equipment, sealed bags and luggage, and protective suits. When selecting, supply the use case, opening length, tape width, host material, water or air pressure, opening frequency and target waterproof rating.

Related series:#10 Resin#5 Resin#5 Nylon#8 Nylon

TPU suits most airtight waterproof projects. PEVA suits lightweight and economy waterproof products. Silicone rubber suits wide temperature ranges and high-end sealing. Nylon woven with TPU suits garments and flexible fabrics. Resin teeth with a sealing layer suit openings that need higher strength.

Related series:#10 Resin#5 ResinPEVA#5 NylonDrysuit Envelope

To judge whether an airtight zipper suits a product you need to confirm the sealing objective, mounting method, material compatibility, force direction, bend radius, opening frequency, end structure, maintenance environment and the test results of the finished assembly.

IPX6 means protection against powerful water jets, IPX7 means protection against temporary immersion, and IPX8 means continuous immersion under agreed conditions. When selecting, define the test depth, pressure, duration, mounting method, end structure and whether the zipper must be opened and closed repeatedly.

Common installation methods for airtight waterproof zippers include high-frequency welding, heat pressing, sewing followed by seam taping, adhesive bonding and combined processes. The choice depends on the host material, sealing grade, force direction, appearance requirements and production process.

YILON airtight zippers reference a 60 kPa sealing pressure test. The pressure actually withstood depends on the size (#5/#8/#10), material, installation method and end structure. The specific figure is subject to your project’s test conditions.

Related series:#10 ResinCircular

TPU material has a reference temperature range of approximately -30°C to 70°C. PEVA and silicone rubber have different temperature ranges. The specific figure is subject to the material chosen and your project testing.

The lifespan of an airtight waterproof zipper depends on the environment, opening frequency, installation and maintenance. It should be cleaned and dried after contact with seawater, sand or dust, lubricated with a compatible method, protected from hard folding, forced pulling, trapped fabric and opening while sandy, and the slider, ends, sealing film and seams should be checked regularly.

YILON sample and quality confirmation should cover model, colour, length, opening style, slider, end structure, dimensions, tolerances, 3,000+ open/close cycles, airtight/watertight testing, assembly testing with the customer’s own material, packaging, batch identification, lead time, sampling method and acceptance criteria.

Before bulk purchasing, confirm drawings and samples first, then carry out installation testing with the real material, open/close cycle testing, immersion or spray testing, air pressure testing, bending testing and visual and dimensional confirmation.

Common tests include waterproof rating testing (IPX6/IPX7/IPX8, referring to the IEC 60529 standard), sealing pressure and pressure-holding testing, open/close cycle life testing, salt spray testing and temperature resistance testing. The specific test items and standards are carried out according to project requirements and as agreed between both parties, subject to the test report.

To customise an airtight waterproof zipper you need to provide the use case, length range (5 cm to 100 m), effective opening length, size or tape width, colour, opening style, slider count, host material, waterproof rating, oil resistance requirements, sample quantity, trial production quantity and mass production quantity.

Typical reference: sampling is about 7–15 days and mass production is about 15–30 days, depending on specification, material and quantity, subject to confirmation by the manufacturer. It is advisable to confirm both the sampling and production lead times at the time of enquiry.

The minimum order quantity depends on the specification and material; there is no single figure. Provide your estimated quantity with your enquiry and YILON will confirm it against your specific project.

Dongtai YILON Industrial Co., Ltd. was founded in 2014 in Dongtai City, Jiangsu Province. It is a National High-Tech Enterprise focused on the R&D, production and sales of airtight waterproof zippers, with its own R&D team and multiple technical patents. It serves more than 300 enterprise clients worldwide and exports to more than 30 countries and regions. Certification documents are available on request.

YILON products are exported to more than 30 countries and regions, including North America, Europe, Southeast Asia and the Middle East. The company has long-term, stable partnerships with more than 300 enterprise clients worldwide and takes part in international exhibitions.

YILON publishes a technical guides section covering the selection guide, the IPX rating chart, material comparison, manufacturing process, drysuit zippers, inflatable gear sealing, a manufacturer comparison and a procurement checklist. You can also contact YILON directly for samples and selection advice.