"Silk Fabric Guide: Bombyx Mori Mulberry Silk, Weave Types, and Global Sericulture"

Silk is a natural protein fiber produced by the larvae of the domesticated silkworm Bombyx mori, which spins a cocoon from a single continuous filament of fibroin protein coated with sericin, a gummy binding protein. Each cocoon yields a filament 600 to 1,500 meters in length, though only 300 to 800 meters is typically reelable as unbroken filament silk.

Sericulture and Mulberry Silk

Bombyx mori silkworms feed exclusively on the leaves of the mulberry tree (Morus alba), giving mulberry silk its name. Sericulture, the practice of raising silkworms for silk production, originated in China approximately 5,000 years ago and remained a closely guarded secret for millennia. A single kilogram of raw silk requires roughly 5,500 silkworms consuming approximately 200 kilograms of mulberry leaves.

The production process begins with silkworm eggs that hatch into larvae. Over a 25 to 30 day period, the larvae molt four times, consuming increasing quantities of mulberry leaves. When ready to spin, the silkworm extrudes liquid fibroin from two glands in its head, which solidifies on contact with air. The worm moves its head in a figure-eight pattern to build the cocoon over 2 to 3 days. Cocoons destined for filament silk are steamed or heated to kill the pupa before it emerges and breaks the filament. Those left to emerge produce shorter fibers used for spun silk.

China's Dominance and Global Production

China occupies a commanding position in global silk production, accounting for approximately 80 percent of the world's raw silk output. The Chinese provinces of Zhejiang, Jiangsu, Sichuan, and Guangdong are historical and current centers of sericulture. India ranks as the second-largest producer with roughly 15 percent of global production, and it is the largest consumer of silk domestically. Other significant producers include Uzbekistan, Thailand, and Brazil.

Brazil has emerged as a notable silk producer because Bombyx mori farming integrates well with smallholder agriculture and requires relatively low capital investment. Brazilian silk tends to be produced under stricter quality control, offering consistent, high-grade filament favored by premium European textile mills.

The global raw silk market is estimated at 150,000 to 160,000 metric tonnes annually, a tiny fraction of cotton's 25 million tonnes, reinforcing silk's position as a luxury fiber.

Momme Weight

Silk fabric weight is traditionally measured in momme (pronounced mommy and abbreviated mm), a Japanese unit where 1 momme equals 3.75 grams per square meter or 4.34 grams per square yard. Typical silk fabrics range from 6 momme (gauze-like sheers) to 30 momme (heavy suiting). The standard for quality silk scarves and blouses is 12 to 14 momme, while high-end pillowcases and bedding are typically 19 to 25 momme. Heavier momme silks drape better, are more durable, and resist wrinkling more effectively than lighter grades.

Silk Weave Types

Charmeuse is the most recognized silk weave, characterized by a satin face with a dull back. Its long float threads create a reflective, liquid-like surface with exceptional drape. Charmeuse is the default choice for luxury lingerie, evening gowns, and pillowcases.

Habotai, also called China silk, is a plain-weave silk that is lighter, less lustrous, and more affordable than charmeuse. It has a soft, matte finish suitable for linings, scarves, and lightweight blouses. Habotai typically weighs 8 to 12 momme.

Dupioni is a plain-weave silk with a distinctive slubbed texture created when two silkworms spin their cocoons together, producing an irregular, doubled filament. The resulting fabric has a crisp hand, nubby surface, and subtle sheen. Dupioni is favored for bridal wear, formal jackets, and structured garments that benefit from its body and texture.