Mulberry silk

The international standard for silk quality is graded from 6A (highest) to A, B, and C. For premium B2B sourcing, you should prioritize 6A grade long-fiber mulberry silk, which ensures the highest level of uniformity, strength, and pearlescent luster. Always request a Momme (mm) count—typically 19mm, 22mm, or 25mm for bedding and garments—as this indicates the density and durability of the fabric.

To ensure the silk is free from harmful chemicals, verify that the supplier holds the OEKO-TEX® Standard 100 certification. For organic claims, look for GOTS (Global Organic Textile Standard). If you are exporting to the US or EU, ensure the products comply with REACH regulations and flammability standards (e.g., 16 CFR Part 1610), although pure silk is naturally flame-resistant.

Confirm the colorfastness to washing and light (Grade 4 or higher) to prevent fading. Inquire about the use of reactive dyes, which are more eco-friendly and skin-safe. For finished goods like pillowcases or eye masks, specify the sewing density (at least 11-13 stitches per inch) and the use of concealed zippers or French seams to enhance product longevity and luxury appeal.

Request a burn test report or video: genuine silk smells like burnt hair and leaves crushable black ash, whereas polyester smells like plastic and forms a hard bead. Additionally, check for microscopic fiber analysis in third-party lab reports to ensure there is no blending with rayon or viscose unless specified.

The primary risk is material substitution, where a supplier blends mulberry silk with tussah silk or synthetic fibers to lower costs. To mitigate this, use third-party inspection services (like SGS or Intertek) to perform random sampling before the final balance payment. Another risk is moisture damage during sea freight; ensure the supplier uses vacuum packaging or moisture-proof PE bags with desiccant packs.

Silk prices are tied to global raw silk indices, so be wary of prices significantly below market value. For customized colors (lab dips), suppliers usually require an MOQ of 500-1000 meters, but many top-tier manufacturers on Made-in-China.com offer flexible MOQs for stocked colors. Negotiate for tiered pricing where the unit cost drops by 10-15% as volume exceeds 2,000 units.

Silk is a high-value, low-weight commodity. For smaller high-end batches, Air Freight or Express (DHL/FedEx) is recommended to reduce transit time and exposure to humidity. For bulk fabric rolls, ensure they are rolled on strong tubes to prevent permanent creasing. Always clarify Incoterms (FOB or CIF) and ensure the Harmonized System (HS) Code (e.g., 5007.20 for silk fabrics) is correctly declared to avoid customs delays.

Always conduct transactions through secure payment channels that offer buyer protection. Prioritize Audited Suppliers on Made-in-China.com, as their manufacturing capabilities and business licenses have been verified by independent agencies. Request a Proforma Invoice (PI) that clearly outlines the Momme weight, grade, and delivery timeline before sending any deposit.