What are the differences between standard and non - standard shapes?
Hello, not within the scope of the national standard, so it is called non-standard,The standard piece is within the national standardThat's the difference,This GB standard can be found, are unified
This is not an exact statement for aluminum standard and non - standard, if only to meet the standards is not comprehensive, such as building materials and industrial aluminum profiles of the points, take the building materials, building materials have Aluminum Alloy standard GB5237.1-6-2008, in this standard, the size of section tolerance, mechanical properties, surface treatment quality by grade are made clear, such as the wall thickness profiles allow positive and negative tolerance. The provisions of the standard aluminum doors and windows, for aluminum windows, the wall thickness must be greater than 1.4mm, used for aluminum doors, and its wall thickness must be greater than 2mm. Thus, the aluminum should be standard and non-standard argument, but the qualified and unqualified products, for material strength, surface treatment quality, form and position tolerance must meet the standard requirements for wall thickness according to the thickness of the corresponding use of selected aluminum.