PVC flat hoses are widely used in irrigation, drainage, gardening, and many other fields. Due to their lightweight, durable, and cost-effective nature, they have become an essential tool in people's daily lives and work. However, sometimes we notice that a previously flawless hose has troublesome pinholes or small holes, affecting its use, and sometimes making it completely unusable. So, why do PVC flat hoses develop pinholes?

"Invisible Problems" in the Manufacturing Process

The quality of PVC flat hoses starts with the quality of raw materials. If low-quality PVC resin is used or the raw material contains impurities, it may lead to bubbles or weak spots on the hose surface, which are prone to forming pinholes. During processing, PVC resin is heated at high temperatures and extruded into shape. If temperature and pressure are not properly controlled, or if equipment malfunctions, small holes or bubbles may form on the surface of the hose. These holes are typically tiny, but over time, they may expand, affecting the hose's functionality. Therefore, temperature control is critical. If the temperature is too high or too low, it could lead to material decomposition, an uneven surface, or microcracks, which may eventually result in pinholes.

Improper Handling During Transportation and Storage

During transportation, hoses are often subjected to compression or impact, especially when the transportation environment is not ideal. Friction with sharp objects or excessive bending can damage the surface of the hose, eventually causing pinholes. When storing PVC flat hoses, long-term stacking or contact with hard objects can cause excessive localized pressure, leading to surface scratches or damage. When storing PVC flat hoses, try to avoid stacking heavy items on top and ensure that the hoses are kept flat and uncompressed. If a PVC flat hose comes into contact with sharp objects (such as stones, tools, or metal edges), it may result in small holes or cracks. This is particularly true when the hose is used on uneven or harsh surfaces, making it more susceptible to mechanical damage.

Furthermore, every PVC flat hose has a rated working pressure range. Exceeding this pressure range can cause excessive internal pressure, leading to ruptures or pinholes. Therefore, it is essential to ensure that the hose’s operating environment meets its design standards.

Environmental Factors – The "Silent Killers"

Although PVC material has some UV resistance, prolonged exposure to sunlight will cause the hose's surface to gradually age, becoming brittle and more prone to cracking or pinhole formation. This is especially true for hoses used outdoors for extended periods. If the PVC flat hose is exposed to certain highly corrosive chemicals (such as acids, alkalis, or solvents) during use or storage, it may weaken the material, causing cracks or holes. Some strongly corrosive substances can directly erode the PVC material, making it brittle and creating small holes.

How to Check for Pinholes in PVC Flat Hoses?

First, examine the hose under good lighting and check for obvious flaws or depressions on the surface. Hold the hose up to a bright light and look for light passing through the surface, which can help detect pinholes.Next, you can test the hose by filling it with water and applying pressure. If water leaks out or bubbles appear, the hose likely has pinholes.

How to Prevent and Solve the Pinhole Problem?

When purchasing, choose well-known brands and reputable suppliers to ensure that the hose's manufacturing process complies with standards and comes with a quality guarantee.

During transportation and storage, avoid contact between the hose and sharp objects, and prevent compression. The hose should be kept flat and uncompressed.

Ensure that the working pressure of the hose stays within the specified range during use, avoid overstretching or excessive bending, and keep it away from sharp objects.

Regularly check the condition of the hose, especially when it is being used or relocated to a new working environment. Address any issues promptly.