Standards: China GB/T8485-2008 " The graduation and test for airborne sound insulating properties of windows and doors"
Airborne sound weighted transmission loss is more than Rw: 37 dB (C: 0, Cte:-2)
1. Main material: Door frame and door leaf use the high quality cold rolled galvanized steel plate, the double-side hot galvanizing treatment.The thickness of the frame plate is ≥ 1.5mm the thickness of door leaf is ≥1.0mm.The plate hardness is ≥ 42. Bottom frame use stainless steel mterial.
2. Door frame: double airtight groove inside Door frame, which should be installed with sealing strip which is made of non-combustible material.The door frame is reinforced with galvanized steel plate with thickness ≥1.5mm.
3. Door leaf thickness ≥50 mm, internal configuration to strengthen steel keel, four corners with enhanced, fills in pearlite or rock wool, door leaf fixed by rivet, the door leaf edges with super wide sealing strip;
4. Hinge: material is high quality stainless steel. Hinged steel plate is reinforced with a thickness ≥1.2mm.The reinforcement is provided with a screw hole, galvanized steel plate thickness is ≥ 3.0mm