Polyethylene terephthalate

Buyers must prioritize Intrinsic Viscosity (IV), which determines the material's strength and application; for example, 0.80–0.85 dL/g is standard for bottle grade, while higher IV is needed for industrial strapping. Additionally, monitor the Acetaldehyde (AA) content, especially for water bottle production, where levels must be <1.0 ppm to avoid affecting taste. Ensure the melting point is stable around 245-260°C for consistent processing.

For food and beverage packaging, the material must comply with FDA (21 CFR 177.1630) for the US market or EU Regulation No. 10/2011 for Europe. Suppliers should provide Migration Test Reports and REACH/RoHS certifications. If sourcing recycled PET (rPET), ensure it has GRAS (Generally Recognized as Safe) status or equivalent food-grade decontamination certification.

PET is highly hygroscopic. Suppliers must ensure the resin is delivered with a moisture content of <0.4%, but processors must dry it further to <0.005% (50 ppm) before injection or extrusion. Failure to do so leads to hydrolytic degradation, resulting in brittleness, loss of transparency, and reduced mechanical properties in the final product.

Virgin PET offers superior clarity and consistent mechanical properties, ideal for high-end packaging. rPET is increasingly demanded for sustainability goals but may have slight color variations (yellowish tint). When sourcing rPET, verify the Post-Consumer Recycle (PCR) percentage and ensure the supplier uses advanced optical sorting and washing technologies to maintain purity.

PET prices are closely linked to crude oil and Paraxylene (PX) feedstocks. To manage risk, consider long-term contracts with price indexing or utilize Made-in-China.com's Diamond Members who often offer more stable pricing. Avoid spot-buying during peak seasons (Q2 and Q3) when beverage demand spikes.

PET should be shipped in moisture-proof Jumbo Bags (1.1 metric tons) or bulk liners. Ensure the containers are clean and free of odors, as PET can absorb scents. During transit, maintain cool, dry conditions and avoid direct sunlight to prevent premature aging or clumping of the resin pellets.

Always request a Pre-Shipment Inspection (PSI) by third parties like SGS or Intertek to verify the IV levels and contamination rates. Use Secure Payment services provided by reputable B2B platforms like Made-in-China.com to ensure funds are only released upon confirmation of shipping documents (Bill of Lading).

Focus on volume-based rebates and payment terms (e.g., L/C at sight or T/T 30/70). Suppliers are more likely to offer discounts if you provide a rolling 6-month forecast, as this allows them to optimize their production schedules and raw material procurement.