... absorbing materialAvailable Sizes (mm) 85.5*54,70*40,73*23, 50*50,45*45,43*26, 36*20, 35*35, 30*15 ... *32, 37*25, 32*27, 19*35, φ25,φ30, φ45,φ50,etcIn customizedWorking EnvironmentWorking life: 5 years Store temperature: -25 °C ... ~50 °C Humidity 20% ~ 90%RH Working temperature: -40 °C~ 65 ° ...