... steel, high classWe owe 15 yeas experiences in silicone oil rotary damper, and we always control the quality from the very ... original material.LF-33, ROTARY DAMPER, OPERATION ANGLE 110°, CLOCKWISE OR COUNTER CLOCKWISE, STAINLESS STEEL ... more.Repeat the closing time test for both positions on30 dampers and record the results.4/ High Temperature test –Expose damper ...