... with CE 600*600,300*600,600*1200,300*1200 sound absorption ISO14001:2004 ISO9001:2008 CE 6.5-20mm mineral wool ceiling board with ... ,no radiation,formaldehyde content<=0.1mg/L Acoustical Performance: Comply with requirments of JC/T 670-2005 Product feature :Sound absorbing ... ,warm-keeping,energy-saving, Certificate: ISO9001:2008 ISO 14001:2004 CE Certificate mineral wool ceiling board with CE