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Contact SupplierPolyisocyanurate is called PIR for short. PIR product is added with excessive polyisocyanurate; besides,the cyclic structure and higher-index isocyanurate is brought into the compound to orm compact polyisocyanurate for the purpose of stabilizing internal forms and endowing high heat resistance and flame retardance. According to our experience, the product cold resist 200� in a short time and 160� in a long time.