Silica gel is an important adsorption material with a three-dimensional spatial network structure. Silica gel has the characteristics of large specific surface area, high internal porosity and large water absorption capacity. Its main component is amorphous silica and also contains a certain amount of structural water. The following is the definition and classification analysis of the silica gel industry.
The COVID-19 pandemic has reemphasized the indispensable role of plastics in our daily life. Plastics in terms of personal protective equipment (PPEs) and other single-use medical equipment along with packaging solutions owing to their inherent properties have emerged as a life-savior for protecting the health and safety of the frontline health workers and the common citizens during the pandemic. However, plastics have been deemed as evil polluter due to their indiscriminate littering and mismanagement amid increased plastic usage and waste generation during this unprecedented crisis. This article reviews and assesses to dwell upon whether plastics in the time of pandemic are acting as protector of the public health or polluter of the environment. Considering the utilities and limitations of plastic along with its management or mismanagement, and the fate, an equitable appraisal suggests that the consumers' irresponsible behavior, and attitude and poor awareness, and the stress on wast
Warpage deformation means that the shape of the injection molded product is distorted and warped unevenly, which deviates from the shape accuracy requirements of the part. It is one of the most difficult product defects to be solved in injection mold design and injection production. With the development of the plastics industry, especially the development of the electronic information industry, the requirements for the appearance and performance of plastic products are getting higher and higher. For plastic shell parts such as notebooks, PDAs, and flat and thin mobile phones, the degree of warpage deformation has been regarded as one of the important indicators for evaluating product quality, and has attracted more and more attention and attention from mold designers. It is hoped that the possible warping causes of plastic parts can be predicted in the design stage, so as to optimize the design, reduce the warping deformation of the product, and meet the accuracy requirements of produc