The characteristic of this type is Butt End Anti-seismic joint tenon and punched with sawtooth fireproof holes. We name it as Fireproof and Anti-seismic T-BAR. The advanced design of joint tenons to be clicked precisely and makes the grid not easy to loose by the external force. The Tensile force (tensile strength and compressive strength) can be reached up to 80 KGf (180Ib), meet the standard of ASTM E580. 412 series is a single process forming product with more convenient in installing and disassembling than traditional anti-seismic grids. Just pull out the Cross tee to complete the disassemble process without any tools. There are saw-tooth fireproof holes near the joint part of Main runner and Cross tees. When a fire accident occurred, the heat makes the saw-tooth fireproof holes deforming instead of the twisting of the whole ceiling system. From that, the ceiling system can keep horizontal and not fallen down to interfere the escape from the fire place. Specs of the product is as follows: