ASTM D5991

ASTM D5991 is a technical standard for the separation and identification of poly(vinyl chloride) (PVC) contamination in poly(ethylene terephthalate) (PET) flake. It is used to support material evaluation where even small amounts of PVC can affect PET recycling and downstream processing. By providing a common practice for detecting and distinguishing contamination, the standard helps promote more consistent quality control, material acceptance, and process reliability in PET flake applications.

ASTM D5991 standard overview

This ASTM standard focuses on a practical method for separating and identifying PVC contamination within PET flake. In recycling and reprocessing workflows, the ability to recognize unwanted PVC is important because contamination can influence product quality and performance. ASTM D5991 provides a shared technical reference for this type of assessment, helping users apply a more consistent approach when evaluating PET flake for cleanliness, suitability, and conformance to internal or buyer requirements.

Where is ASTM D5991 used?

ASTM D5991 is commonly used in PET flake evaluation steps associated with recycling, sorting, inspection, and material acceptance. It is relevant where PET flake is prepared for further processing and where PVC contamination must be identified before downstream use. The standard is often applied in quality control settings, incoming material checks, and laboratory or plant workflows that support recycled plastic handling. It helps users make more informed decisions about material separation and classification.

Practical importance of ASTM D5991

The practical value of ASTM D5991 lies in improving consistency when checking PET flake for PVC contamination. This can support compliance efforts, reduce processing risk, and improve confidence in material quality during procurement or production. A common standard also helps align testing expectations between suppliers and buyers, which can be useful when evaluating recycled feedstock. For operations that depend on clean PET flake, it offers a clearer basis for quality control and material screening.

• PVC contamination identification
• PET flake separation practice
• Quality control reference
• Material acceptance support
• Recycling workflow consistency