Air heat aging test chambers are commonly used in hot air aging tests for rubber and plastic products, electrical insulation, and other materials. The temperature control adopts digital display and PID auto-tuning temperature controller. The working temperature can be arbitrarily set, automatic constant temperature, natural convection of hot air, and rapid aging of the sample under constant temperature. The host structure, instrumentation and materials are designed after detailed study of the air flow and temperature inside the box. It has the advantages of sensitive temperature control, good temperature uniformity, large effective space, and stable performance. Type A conforms to the national standard of GB3512, and Type B conforms to standards of JB/T4278.6-2001 natural ventilation heat aging test box, IEC60811-1-2 heat aging test method, GB/T2951.12-2008, JB/T7444 and other standards. Mini Grass Chopper ,Grass Chopper,Grinder Grass Chopper,Grass Cutter Straw Chopper Shuangfeng Nongjiabao Machinery Technology Co., Ltd , http://www.starchmakingmachine.com