Basic Differentiation of Thread Materials
The threaded portion of PPR pipe fittings is typically made of stainless steel, with 304 and 201 being two common choices. 304 stainless steel contains 18% chromium and 8% nickel, offering better corrosion resistance; 201 stainless steel contains 16% chromium and 3.5% nickel, resulting in lower cost but slightly weaker rust resistance. In practical use, 304 is recommended for humid environments.
Comparison of Application Scenarios
Water Quality Impact: In hard water areas, 304 is recommended as its resistance to chloride ion corrosion is 3 times stronger than 201.
Budget Considerations: 201 material costs approximately 40% less than 304, making it suitable for short-term dry environments.
Maintenance Cycle: 304 threads can remain rust-free for over 5 years outdoors, while 201 lasts approximately 2-3 years.
Practical Purchase Recommendations
Observing the thread surface treatment can quickly determine quality: 304 typically has a matte silver-white finish, while 201 is more grayish-glossy. It is recommended to choose based on the humidity of the environment, the pH of the water, and the expected service life. 304 material should be given priority in humid areas such as kitchens and bathrooms.
