Mulberry silk’s standing as one of the world’s most advanced natural fibres rests on measurable structural traits that shape lustre, smoothness, moisture behaviour and skin compatibility. Microscopic analysis links these performance characteristics to the fibre’s triangular geometry and smooth protein surface. The report points to potential applications in textiles, beauty and biomedical materials.
- The study shows that degummed mulberry silk fibres display a rounded triangular prism cross-section that refracts and diffuses light, producing the soft glow historically associated with premium silk textiles.
- High-magnification microscopy also reveals an exceptionally smooth fibre surface without scales or rough protrusions, reducing friction during prolonged contact with skin and hair.
- Comparative microscopic analysis contrasts silk with cotton’s twisted ribbon-like fibres and polyester’s cylindrical surfaces, highlighting structural differences affecting tactile smoothness, breathability and skin comfort.
- The report, Micro-Structural Analysis & Physicochemical Properties of 6A Grade Silk, published by Docsun Silk Lab, examines the microscopic architecture and physicochemical behaviour of mulberry silk fibres.
WHAT THE DATA SHOWS: Microscopic analysis of mulberry silk fibres indicates that their distinctive performance characteristics stem from a unique natural architecture combining triangular cross-sections and smooth protein surfaces. Degummed fibres form a rounded triangular prism rather than the cylindrical profile typical of many synthetic fibres. This geometry shapes how silk interacts with light and physical contact, influencing the optical and tactile qualities associated with premium silk textiles.
- Scanning electron microscopy shows the fibre’s triangular prism cross-section refracts and diffuses incoming light, producing the soft pearlescent lustre associated with mulberry silk fabrics.
- Unlike synthetic fibres that reflect light uniformly, silk’s natural geometry scatters light at multiple angles, creating a more subtle glow rather than a sharp specular shine.
- High-magnification imaging also reveals an extremely smooth longitudinal surface without scales or protrusions, a structural feature that significantly reduces friction during contact with skin or hair.
- Tribological research cited in the report indicates hydrated silk fibroin can reach friction levels approaching those of natural cartilage lubrication.
- Lower friction reduces mechanical stress during prolonged contact with skin and hair, helping explain the material’s use in pillowcases, sleep masks, scrunchies, luxury bedding and related textile products.
THE BROADER VIEW: Microscopic comparison with other common textile fibres illustrates how mulberry silk differs in structure and behaviour. Structural imaging shows clear contrasts between silk’s triangular geometry, cotton’s twisted ribbon-like structure and polyester’s cylindrical form. These differences influence how fibres interact with light, moisture, breathability and skin contact across textile applications, while also informing biomedical research on silk-based materials.
- Cotton fibres display twisted ribbon-like structures with hollow lumen channels, which enhance moisture absorption but also increase surface friction compared with silk.
- Polyester fibres typically show smooth cylindrical surfaces that reflect light directly, producing a sharper specular reflection often perceived as synthetic shine.
- These structural differences influence tactile smoothness, breathability and skin comfort across textile materials used in apparel and bedding products.
- Beyond textiles, the report cites extensive biomedical research showing purified silk fibroin has long been used in FDA-approved surgical sutures and tissue engineering scaffolds.
- Docsun describes its Silk Lab initiative as an effort to study natural fibres using modern analytical methods to understand how traditional materials perform at the microscopic level.
