Polyester interlock fabric

Buyers should prioritize GSM (Grams per Square Meter), typically ranging from 180 to 300 GSM for interlock weaves, to ensure the desired thickness and opacity. It is crucial to verify the yarn count (e.g., 75D/72F or 100D/144F), as a higher filament count results in a softer hand-feel and better moisture-wicking properties. Additionally, ensure the fabric has a bursting strength of ≥ 250 kPa for sportswear applications.

Request OEKO-TEX® Standard 100 certification to guarantee the fabric is free from harmful substances. For recycled polyester, verify the GRS (Global Recycled Standard) certificate. If the fabric is intended for the EU market, ensure compliance with REACH regulations, and for the US market, check for flammability standards (16 CFR Part 1610) if used in apparel.

Depending on the end-use, you can request Quick-Dry (Wicking) finishes, Anti-Bacterial/Anti-Odor treatments (Silver Ion), and UV Protection (UPF 50+). For outdoor or activewear, ensure the colorfastness to perspiration and washing meets a minimum of Grade 4 on the grayscale to prevent bleeding and fading.

Interlock is a double-knit fabric that is thicker, more stable, and does not curl at the edges, making it easier for garment factories to sew. While the unit price per kilogram is generally higher than single jersey due to the increased weight and complex knitting process, it offers superior durability and a premium feel, which can justify a higher retail price for the finished garment.

Always request a Lab Dip (A/B/C options) for color approval before mass production. For large orders, insist on a pre-shipment sample (PSS) from the actual bulk production lot. Use a spectrophotometer to ensure the color difference (Delta E) is less than 1.0 compared to the approved standard.

Focus on Total Cost of Ownership (TCO) rather than just the price per meter. Negotiate based on volume tiers; for example, a 5-10% discount is often achievable when exceeding 1,000 kg per color. Utilize platforms like Made-in-China.com to check the supplier's Audit Reports and Diamond Member status to verify their manufacturing scale and reliability.

Ensure the supplier uses double-layer packaging (inner plastic bag + outer woven bag) to prevent moisture and dirt contamination during sea transit. Specify that rolls should be hard-paper tube cored to prevent crushing. For LCL shipments, request palletization to minimize handling damage and facilitate easier unloading at the destination.

Use Secured Payment services or Letters of Credit (L/C) for large transactions. Include a Quality Agreement in the contract that specifies the Acceptable Quality Level (AQL 2.5/4.0). If a defect is found, a third-party inspection (e.g., SGS or Intertek) report is the most powerful tool for claiming compensation or requesting a re-run.