Raw silk

Raw silk quality is primarily determined by its grade (6A, 5A, 4A, etc.), with 6A being the highest international standard for uniformity, strength, and cleanliness. Buyers should focus on the momme weight (mm) for thickness—typically 12mm to 19mm for standard garments and 22mm+ for premium bedding. Key technical indicators include tensile strength, elongation, and the exfoliation degree, which affects how the silk reacts to dyeing and processing.

To ensure market access and consumer safety, prioritize suppliers with OEKO-TEX® Standard 100 certification, which guarantees the silk is free from harmful chemicals. For organic claims, verify GOTS (Global Organic Textile Standard). If exporting to the US or EU, ensure compliance with REACH regulations and flammability standards (16 CFR Part 1610), as silk is a natural fiber with specific burning characteristics.

Raw silk is highly versatile, used in high-end fashion (bridal wear, sarees, suits), home textiles (hypoallergenic bedding), and even medical applications (surgical sutures) due to its biocompatibility. Functional requirements include moisture-wicking capabilities, thermal regulation, and skin-friendly sericin content. For industrial use, focus on filament length and cohesion to ensure high-speed weaving efficiency.

Silk prices are volatile as they are tied to commodity market fluctuations. To optimize costs, consider bulk purchasing during harvest seasons (typically spring and autumn) to secure lower rates. Negotiate tiered pricing where a 15-20% discount is applied for orders exceeding 500kg. Additionally, evaluate the yield rate; higher-grade silk (5A/6A) reduces waste during manufacturing, often resulting in a lower Total Cost of Ownership (TCO) despite a higher initial price.

The biggest risks are material substitution (synthetic blends passed as 100% silk) and moisture weight fraud. Mitigate this by requiring a Burn Test report and a third-party inspection (like SGS or Intertek) before final payment. Ensure the contract specifies the allowable moisture regain (standard is 11%) to avoid paying for water weight added during packing.

Focus negotiations on quality consistency and lead times rather than just price. Request pre-shipment samples (PSS) from the actual production lot. Use Made-in-China.com's Secured Trading services to protect your funds until the quality is verified. Ask for transparency in the cocoon sourcing origin, as regional climate affects the silk's luster and purity.

Silk is highly sensitive to humidity and odors. Ensure the supplier uses vacuum-sealed PE bags and sturdy corrugated boxes to prevent moisture absorption and mold during sea freight. For high-value raw silk yarn, air freight is recommended to minimize transit time and environmental exposure. Always include desiccant silica gel packs in the packaging.

Check for Anti-Dumping Duties (ADD) or specific quotas on silk textiles in your country. Ensure the HS Code (typically 5002.00 for Raw Silk) is correctly declared on the Commercial Invoice and Packing List to avoid customs delays. Provide a Certificate of Origin to benefit from preferential tariffs under trade agreements like RCEP or bilateral FTAs.