Silk fiber

Silk fiber quality is primarily categorized by the 6A Grade system, which is the highest international standard for raw silk. When sourcing, you must verify the uniformity, cleanliness, and tensile strength of the fibers. Ensure the supplier provides a test report indicating the grade (ranging from A to 6A), as higher grades result in fewer breakages during weaving and a more luxurious luster in the final textile.

Buyers should distinguish between Mulberry Silk (the highest quality, produced by silkworms fed only on mulberry leaves) and Tussah Silk (wild silk with a coarser texture). Key specifications include Momme weight (for fabric density, typically 16-25mm for high-end goods) and fiber length. Long-fiber silk is essential for preventing pilling and shedding in premium bedding and apparel.

To ensure consumer safety and market access, silk products should meet the OEKO-TEX® Standard 100 certification, which guarantees the absence of harmful chemicals. For organic claims, verify the GOTS (Global Organic Textile Standard). Additionally, ensure compliance with flammability standards (such as 16 CFR Part 1610 in the US) and labeling regulations regarding fiber content accuracy.

Silk has a high moisture regain of approximately 11%, which makes it breathable but also susceptible to weight fluctuations during shipping. You should specify the allowable moisture content in your contract to avoid paying for water weight. Furthermore, confirm that the dyeing process uses eco-friendly, colorfast dyes that meet ISO 105-B02 standards for lightfastness.

The most significant risk is material substitution, where silk is blended with synthetic fibers like polyester. To mitigate this, always request a burn test or a solubility test (using sodium hypochlorite). We strongly recommend using third-party inspection services before final payment to verify that the batch matches the approved sample.

When negotiating on Made-in-China.com, focus on Tiered Pricing based on volume and Lead Time guarantees. Since silk prices fluctuate with the global cocoon market, consider signing long-term framework agreements to lock in prices. Always clarify the Incoterms (e.g., FOB or CIF) to understand exactly where your liability begins.

Silk is highly sensitive to humidity and odors. Ensure the supplier uses vacuum-sealed plastic inner packaging and sturdy, moisture-proof outer cartons. For bulk raw silk, desiccant packs are mandatory. When shipping to countries with strict agricultural controls, ensure the Phytosanitary Certificate and Certificate of Origin are included to prevent customs delays.

Utilize the secured payment systems provided by Made-in-China.com to ensure funds are only released upon proof of shipment. Avoid direct wire transfers to private accounts. Always verify the supplier's Business License and Export Qualification through the platform's audit reports to ensure you are dealing with a legitimate manufacturer rather than an unlicensed middleman.