Find HS Code and trade information for silk thread

Silk Thread

Silk thread refers to fibers produced by certain insect larvae to form cocoons and webs, most notably by the silkworm of the mulberry silkmoth Bombyx mori. It is a natural protein fiber with a history of use spanning millennia, prized for its strength, luster, and texture.

Material

• Composition: Primarily fibroin, an insoluble protein, and sericin, a gummy protein that binds the fibroin filaments together.
• Production: Silkworms feed on mulberry leaves and produce liquid silk which hardens into a continuous filament when excreted. Multiple filaments are combined to form a single silk strand. Other insects, such as spiders, also produce silk, but spider silk is generally not commercially viable due to difficulties in large-scale farming.
• Variations: Silk quality and characteristics vary based on the silkworm breed, diet, and processing methods.

Purpose

Silk thread's primary historical and contemporary uses include:

• Textiles: The most significant application, used for weaving fabrics for clothing, bedding, and upholstery.
• Sewing: Used for hand and machine sewing due to its strength and smooth texture.
• Embroidery: Highly valued for its luster and ability to create intricate designs.
• Medical: Used in surgical sutures due to its biocompatibility and biodegradability.
• Industrial: Applications in bicycle tires, parachutes, and other specialized materials.

Function

• Strength: Silk possesses a high tensile strength, comparable to steel on a weight basis.
• Elasticity: Exhibits good elasticity, allowing fabrics to drape well and resist wrinkling.
• Luster: The unique structure of silk fibers refracts light, creating a natural sheen.
• Temperature Regulation: Silk is a breathable fiber with excellent insulating properties, keeping wearers cool in warm weather and warm in cool weather.
• Absorbency: Silk can absorb moisture, making it comfortable to wear.

Usage Scenarios

• Apparel: Dresses, blouses, scarves, ties, lingerie, pajamas.
• Home Furnishings: Bedding (sheets, pillowcases, duvets), curtains, upholstery, rugs.
• Crafts: Embroidery, quilting, ribbon work.
• Healthcare: Sutures, wound dressings.
• Specialty Applications: Parachute cords, bicycle tire reinforcement.

Common Types

• Mulberry Silk: The most common type, produced by silkworms fed exclusively on mulberry leaves. Known for its high quality, luster, and strength.
• Eri Silk: Produced by silkworms that feed on castor leaves. Has a coarser texture and a duller sheen than mulberry silk. Often used for warm clothing.
• Tussah Silk: Produced by wild silkworms. Has a more rugged texture and a natural golden color.
• Muga Silk: A rare type of silk from Assam, India, known for its golden color and durability.
• Spider Silk: While not commercially widespread, research continues on utilizing spider silk for its exceptional strength and elasticity.

Silk thread can refer to yarn not put up for retail sale or yarn put up for retail sale. The following HS codes are relevant based on the provided information:

• 5004000000: This HS code covers Silk yarn (other than yarn spun from silk waste) not put up for retail sale.
  • 50: Chapter 50 relates to Silk.
  • 04: Heading 04 specifically covers Silk yarn and woven fabrics of silk.
  • 000000: This further specifies yarn not put up for retail sale.
• 5005000010: This HS code covers Yarn spun from silk waste, not put up for retail sale Containing 85 percent or more by weight of silk or silk waste.
  • 50: Chapter 50 relates to Silk.
  • 05: Heading 05 specifically covers Wool, fine or coarse animal hair, silk, textile waste material.
  • 000010: This further specifies yarn spun from silk waste, not put up for retail sale, containing 85% or more silk or silk waste.
• 5005000090: This HS code covers Yarn spun from silk waste, not put up for retail sale Other (800).
  • 50: Chapter 50 relates to Silk.
  • 05: Heading 05 specifically covers Wool, fine or coarse animal hair, silk, textile waste material.
  • 000090: This further specifies yarn spun from silk waste, not put up for retail sale, other.

Regarding these HS codes, the tax rate is a base rate of 0.0%, with an additional tariff of 25.0%. After April 2, 2025, the additional tariff will increase to 30.0%, resulting in a total tax rate of 55.0%.