It is a kind of powdery high molecular silk protein with average molecular of 300,000, which has no taste, no odor and is slightly soluble in water, while not in alcoholic aldehyde.
·Specification:
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Items
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Average particle size
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Silk powder 40
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40 micron
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Silk powder 10
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10 micron
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Silk powder 5
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5 micron
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Silk powder 2
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2 micron
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Nano –Silk powder
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350 nm
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Quality Index:
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Items
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Index
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Appearance
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White or slightly jasmine powder
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Total Nitrogen
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≥14.5%
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Weight loss on drying
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≤6.0%
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Residue on ignition
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≤4.0%
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pH value
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5.0-7.0
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·Application characteristics:
Because of the hydrophilic gene in the structure of silk, silk protein powder is a fine natural moisture factor. Attaching to the surface of the skin with extremely thin layer of silk powder can control the water absorption or release, according to the changes in skin temperature and humidity. It has great effects in skin care, prevention and treatment for various types dermatosis caused by dry or moist skin.
Since the crystalline structure of silk powder can reflect some ultraviolet light and the space caused by its spiral shape can also absorb some UV light, silk powder can be used in sunscreen products.
The silk powder possesses a unique ability of absorbing oil; therefore, it is suitable for the cosmetics applied to oily skin.
Because of the special structure of decreasing the reflective light, the silk powder can be applied into cosmetics based on mica powder to reflect the real & soft color naturally. Compared with talcum powder or titanium white powder, the silk powder has excellent character of air permeability so that it is suitable for make-ups, such as the facial powder or rouge etc. 
