Below is a write-up detailing the technical specifications of the ASTM B241 standard and the characteristics of the MP4 format it might be presented in. 1. The ASTM B241 Standard

B241/B241M Standard Specification for Aluminum and ... - ASTM

: These pipes and tubes must be produced from hollow extrusion ingots and extruded using the die and mandrel method. Producers may also cold-draw the material to achieve specific characteristics.