▲塑料门上海化工厂与上海民用建筑设计院合作,采用国产PVC原料制成一种塑料门。这种塑料门由于添加了提高抗冲性能的助剂,使用寿命与木门、铁门相仿,具有耐冲击、抗腐蚀及不需用涂料等优点。▲混凝土早强增密剂安徽省建筑科研所研制成混凝土早强增密剂。这种早强增密剂按水泥用量的8～10%掺入混凝土中,与不掺增密 ▲ The plastic door Shanghai Chemical Plant cooperates with Shanghai Civil Architecture Design Institute and uses domestic PVC raw materials to make a plastic door. This kind of plastic door has the advantages of impact resistance, anti-corrosion and no need of coating due to the addition of agents for improving impact resistance, and the service life is similar to that of wooden doors and iron doors. ▲Concrete early strength densifiers were developed into concrete early strength densifiers by Anhui Institute of Construction Science and Technology. This early strength densifier is blended with 8 to 10% of the amount of cement and is not incorporated into the concrete.