Core Viewpoint - Poly United (002037.SZ) primarily engages in the production and sales of civil explosives and blasting engineering services, with no current involvement in the commercial aerospace sector or military products [1] Group 1 - The company's main business activities include the production and sale of civil explosives [1] - The company provides blasting engineering services as part of its core operations [1] - There is no current association with the commercial aerospace field in the company's business activities [1] Group 2 - The company does not produce or sell military products at this time [1]