The degree of aging and aging of polymer compounds such as rubber and plastic is mainly determined by the oxygen content in the atmosphere, the air temperature and the moisture content in the air. The amount of ventilation is an important indicator of the ventilation aging test chamber, and its size directly affects the effect of the product temperature aging test. The general ventilation aging test chamber has two forms of natural ventilation and forced ventilation. The forced convection (blower) or natural convection is used to fully circulate the hot air in the tank to keep the temperature inside the box uniform and eliminate the aging process. The volatiles produced are replenished with fresh air to keep the air content consistent. Therefore, under constant temperature conditions, a certain wind speed or enthalpy corresponds to a certain oxygen, moisture content and temperature uniformity, which corresponds to the reliability of a certain aging test. When the wind speed is large, the gas exchange volume is large, the circulation convection is sufficient, the aging effect is obvious and rapid; when the wind speed is small, the gas exchange amount is small, and the aging effect is slow. Generally, the materials are stipulated in the aging test. For example, the amount of air exchange required for rubber aging is 8 to 20 times per hour (refer to the gas of 8-20 volumes per hour). The aging test should be carried out according to the specified amount of ventilation to obtain better results. Folding Stool Plastic,Outdoor Portable Stool,Colorful Folding Chairs,Foldable Plastic Stool ZHEJIANG HUZOLI METAL PRODUCTS CO.,LTD , https://www.zlplasticfurniture.com