SS304 is the most common used grade for zippers and closures. SS301 & 316 are also required for special use that need more strength or corrosion resistance.
The reason why stainless steel is widely used in zippers and closures is mainly based on the following key advantages:
1. Excellent corrosion & rust resistance
Stainless steel (such as 304 or 316) has strong oxidation resistance and will not rust even in high humidity, acidic (such as tanning agents in high-end leather) or salt spray environments, which is significantly better than copper or zinc alloy zippers.
2. High strength & wear resistance
Stainless steel is a material with high hardness. Zipper teeth and closures are not easily deformed, broken, or worn during frequent opening and closing. It is suitable for use in high-end luggage, outdoor equipment, military and police clothing, and other applications that require high strength.
3. Maintain long-term appearance
Unlike electroplated zippers, stainless steel zippers do not require electroplating and will not fade, scratch or discolor. As time goes by, the surface becomes brighter and more textured due to friction.
4. Balancing cost & sustainability
The lifespan of stainless steel zippers can reach over 10 years (zinc alloy zippers are about 3-5 years), reducing the frequency of replacement. And it’s 100% recyclable (recycling rate > 92%).
What main grades of stainless steel material are used for zippers and closures?
SS304, SS301, SS316
