Eye wash material and surface treatment

Stainless steel is often considered a durable and corrosion-resistant material, but it also has its limitations. The key to its resistance against chemical substances lies in the formation of a passive oxide layer on its surface. However, if this protective film is damaged—whether through improper handling, polishing, or exposure to harsh environments—the corrosion resistance of stainless steel eyewash devices can significantly decrease. In most cases, within three months, rust spots may begin to appear, and over time, these can develop into holes that render the device unusable. Many manufacturers source stainless steel tubes from the market, process them by threading, and then polish the surfaces to make them look smooth and attractive. What they often overlook is that polishing can strip away the passive layer, leaving the material vulnerable to corrosion. Without proper after-sales support, customers end up facing costly replacements and operational issues.

When producing eyewash accessories using stainless steel pipe fittings, certain components require bending. For instance, eye wash nozzles are typically bent at an angle of 113 degrees, while pipettes with hand push handles are bent at 90 degrees. This bending process introduces internal stresses within the material. If these stresses are not properly eliminated through heat treatment or other technical methods, the components become more susceptible to chemical erosion. Additionally, many eyewash units require welding during assembly. The high temperatures involved in welding can further introduce stress into the stainless steel, especially in materials like 304 grade. If not addressed, these stresses can severely compromise the long-term corrosion resistance of the product.

When it comes to corrosion resistance, foreign manufacturers often use materials like stainless steel or brass that are coated with ABS dipping, which offers superior protection against chemicals. It's important to note that in China, there are many eyewash units produced using ABS spray technology. While the surface may appear yellow and have some level of resistance, the difference between ABS dipping and spraying is significant. ABS dipping involves soaking the parts in powder, resulting in a much more durable and chemically resistant finish. On the other hand, some companies use spray painting techniques that only alter the color without providing any real chemical resistance. This distinction is crucial for users who rely on eyewash equipment in environments where exposure to hazardous substances is common.

China Labor Insurance Network