2. Although qualified pvc materials are non-toxic, some inferior products that are not completely polymerized in the production process or products degraded by pvc materials contain certain toxicity. In order to make pvc materials soft and beneficial to production, some manufacturers will add plasticizers in the production process. Plasticizer is a toxic carcinogen, and the finished products made of this material are easy to damage the internal system of human body, thus causing hepatic angiosarcoma, which will seriously endanger human health.