T70/93 Standard of Copper
The T70/93 Standard, which is also known as the Copper Roughness Standard , is an international standard for copper materials and products. It was first introduced in 1993 and amended in 2000 to provide an improved standard of copper roughness.
The T70/93 Standard focuses on copper materials and products of all shapes, sizes and forms. It is used in the global copper markets, from the imports of semi-finished or finished products to the production of pipes and tubes for the construction industry. The T70/93 Standard defines the surface roughness tolerance for copper materials, which can affect their quality, performance, and long-term durability.
The T70/93 Standard specifies two different levels of surface roughness tolerance levels for copper materials: Class A and Class B. Class A is the finest standard, while Class B is slightly less rigorous. As such, Class A products will require more labor, precision and expense in order to meet the standards, but will also likely perform better and last longer than Class B materials.
The T70/93 Standard also defines specific parameters and tolerances for the surface roughness of copper materials and products. Class A materials must have a minimum surface roughness of 0.8 microns and a maximum of 2.0 microns. Class B materials must have a minimum surface roughness of 1.0 microns and a maximum of 3.0 microns. The T70/93 Standard also stipulates that copper materials must be free of any signs of small “pits” on the surface, as these can weaken the material and potentially reduce the performance and life-span of the product.
For pipes, tubes and other objects that feature longitudinal surfaces, the surface roughness parameters and tolerances are slightly different. Class A materials must have a minimum surface roughness of 1.2 microns and a maximum of 2.4 microns, while Class B materials must have a minimum surface roughness of 1.4 microns and a maximum of 3.4 microns. These parameters and tolerances must be met when measuring the surface roughness at five different longitudinal locations on any pipe or tube.
The T70/93 Standard is a widely-used and respected standard for copper materials and products across the world. It ensures that copper components and products meet strict quality requirements, providing users and consumers with a superior level of performance and long-term durability. As such, it is an incredibly important standard for purchasers and sellers of copper or copper-based products in the global marketplace.
