The national standard followed by non-metallic expansion joint in China is mainly JB/T 12235-2015 non-metallic expansion joint. This standard specifies the basic requirements for the design, manufacture, inspection and use of non-metallic expansion joints. It covers the following main elements:
Terms and definitions: The terms of non-metallic expansion joints and related components are defined.
Product Classification and Product Marking: The non-metallic expansion joints are classified according to different parameters and uses, and the marking method of the products is specified.
Requirements: Includes requirements for materials, design, manufacture, performance and inspection to ensure that Expansion Energy Saving operates safely and reliably under predetermined conditions.
Test Methods: Describes how to conduct performance tests of non-metallic expansion joints, such as tightness, cycle life and burst pressure, etc.
Verification rules: The requirements of factory inspection and type inspection are defined to ensure that each batch of products meets the standards.
Marking, packaging, transportation and storage: Specifies the conditions of product identification, packaging, transportation and storage to guarantee that the product is still in good condition when delivered to the user.
In addition, acceptance of non-metallic expansion joints may involve some other criteria, such as:
Appearance inspection standards to ensure that the surface of the expansion joint is free of scratches, cracks, sandwiching, peeling, etc.
Flange thickness standard, with specific regulations for the size and thickness of matching flanges to ensure connection strength and tightness.
Internationally, non-metallic expansion joints may also follow ASTM F1123 or other relevant standards, depending on the region of use and industry specifications.
Please note that the standards are updated regularly, so the latest version should be referred to when using it. If you need up-to-date standards documentation, it is recommended to contact the relevant standardization organization directly or obtain it through its official website.