Rubber expansion joints material must be environmentally friendly, pollution-free, do not contain toxic materials such as lead, material testing. And also to ISO9001 international quality system certification (certificate) is based on the German standard DIN rubber joint slotted flanges and ball composed of rubber shock absorbers. International flange standards there are two main systems, that is in Germany DIN (including the former Soviet Union) as the representative of the European pipe flange system and with the United States as a representative of American pipe flange ANSI pipe flanges system. In addition, Japan JIS flange, but only in the petrochemical installations in General for public works, and influence in the international arena. 

 

IOS7005-1 International Organization for standardization issued a standard in 1992, which the United States and Germany combined two series of pipe flanges and pipe flange standard. DIN rubber joint criteria are more standard not for flanges, DIN flange standard is: DIN2573, 2572, 2631, 2576, 2632 and 2633, 2543, 2634, 2545 (PL, and SO, and WN, and BL, and TH).