👉 The mail fluid, also known as the carrier fluid or carrier liquid, is a critical component in the functioning of pneumatic mail systems. It's a specially formulated oil that lubricates and cushions the air-filled mail carriers, such as pneumatic tubes or bags, ensuring smooth and efficient movement through the network. This fluid reduces friction between moving parts, preventing wear and tear, while also providing a cushion that protects the mail from impacts and vibrations. By maintaining optimal performance and extending the lifespan of the system, the mail fluid is essential for reliable and high-speed mail delivery.
