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The technical principle The SZIP WaterProof is made from a strong, plastic coil zipper on a high strength fabric. Every coil half is safely embedded and secured in a plastic profile. When the SZIP WaterProof is closed the sealing lips above and below the coil are compressed making a perfect seal. The entire plastic profile is highly abrasion resistant. The unique design prevents the slider from wearing down the sealing lips when the zipper is opened or closed. The physical design of the SZIP WaterProof increases the seal strength when the pressure is raised or when cross tension is applied. Both actions lead to an increased mechanical pressure on the top sealing lip Stability The SZIP WaterProof´s performance in terms of strength and durability is outstanding. It can take weight, it is abrasion resistant and it will survive short term sharp bending and twisting without separating. Dirt or Sand The SZIP WaterProof is highly resistant to damage caused by dirt or sand. However if dirt or sand are present, the zipper should be cleaned with soap and water. Dirt particles can affect the sealing function if they get caught between the chain profiles. If the SZIP WaterProof closure is used to protect life or sensitive material, the sealing function and cleanness of the chain area should be double checked prior to every usage. Tightness The SZIP WaterProof is easy to operate, splash-water tight and very suitable for rain clothing. Heavy bending may cause leakage. Please try to avoid! 1.Sizes available:#3/5/8color as you request2.Used for:diving suits,ski wear,outdoor sports equipments,waterproof garments and bags and etc.3.Reliable quality and quick delivery4.Company culture: Specialty(good solution),Sincerity(competitive price),Speedy(fast delivery time)5.Package: PP bags,cartons,rolls,according to your requirements6.Certificates: SGS ISO14001;ISO9001:2000;SA8000;OEKO-TEX standard 100,ect.7.OEM&ODM orders are both welcome! Customers' designs are welcome!Sincerely hope we can help you!Thank you for your time!