標準號：ANSI/ASTM D5991-1997
中文標準名稱：聚乙烯對酞酰小片中聚氯乙烯雜質分離和鑒定慣例
英文標準名稱：Practice for Separation and Identification of Poly(Viny Chloride) (PVC) Contamination in Poly(Ethylene Terephthalate) (PET) Flake
標準類型：G31
發布日期：1999/12/31 12:00:00
實施日期：1997/3/5 12:00:00
中國標準分類號：G31
國際標準分類號：83.080.10
適用范圍：This practice covers four procedures for separation and qualitative identification of poly(vinyl chloride) (PVC) contamination in poly(ethylene terephthalate) (PET) flakes. Note 1 -Although not presented as a quantitative method, procedures presented in this practice may be used to provide quantitative results at the discretion of the user. The user assumes the responsibility to verify the reproducibility of quantitative results. Data from an independent source suggest a PVC detection level of 200 ppm (w/w) based on an original sample weight of 454 g. Procedure A is based on different fluorescence of PVC and PET when these polymers are exposed to ultraviolet (UV) light. Procedure B is an oven test based upon the charring of PVC when it is heated in air at 235C. Procedures C and D are dye tests based on differential staining of PVC and PET. Note 2 -Other polymers (for example, PETG) also absorb the stain or brightener. Such interferences will result in false positive identification of PVC as the contaminant. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazards see Section 8. Note 3 -There is no equivalent ISO standard.