What is the fine-grained topic of the following text: Shenzhen Xiongyihua plastic insulation limited ,was established in 2007 in Shenzhen , is a professional and skillful plastic manufacturer , specialized in the search , development and production of Engineering plastic and insulation plastic , such as Phenolic laminated , Epoxy fiberglass , Durostone , NYLON PA 6 , POM , PE , PC , PVC , PU , PTFE and ABS . Only return the topic.
Shenzhen Xiongyihua Plastic Insulation's specialization in engineering plastic and insulation plastic production