What is Silk Amino Acids CAS 96690-41-4?

Silk Amino Acids CAS 96690-41-4 is a cosmetic ingredient obtained by hydrolyzing silk fibroin into a low molecular weight mixture of amino acids and short peptides. It is also listed as Protein hydrolyzates, silk and is rich in glycine, alanine, and serine.

How are Silk Amino Acids different from hydrolyzed silk protein?

Hydrolyzed silk protein generally refers to higher molecular weight peptides that can form a surface film, while Silk Amino Acids undergo greater hydrolysis to a smaller size. This smaller fraction is water-soluble and better suited to penetrating the hair shaft and conditioning the outer layers of skin.

What cosmetic applications are suitable for this ingredient?

It is used in shampoos, conditioners, hair masks, skin care emulsions, serums, and nail products. In formulations it contributes a silky skin feel, water retention, and conditioning benefits without a heavy or sticky film.

What are the main composition and quality parameters?

The product is typically a white to off-white powder with high glycine, alanine, and serine content. Cosmetic grades commonly report protein content on a dry basis around 90% or higher, total nitrogen around 14.5% or higher, pH about 5-7 in solution, and complete water solubility.

What is the correct CAS and EC number for Silk Amino Acids?

The INCI material is commonly identified as CAS 96690-41-4 and EC 306-235-8. Some supplier pages use a near variant CAS, but the Cosing/INCI listing and many cosmetic suppliers use 96690-41-4.

Silk Amino Acids CAS 96690-41-4

Silk Amino Acids, CAS 96690-41-4, is a low-molecular-weight hydrolyzed silk ingredient supplied for hair care, skin care, color cosmetics and cleansers. Confirm the required grade and specification, then request a quotation with COA/TDS/SDS for bulk supply.

CAS: 96690-41-4
Synonyms: Hydrolyzed Silk Protein, Silk Peptide, Silk Hydrolysate, Mixed amino acids from silk, Sericin amino acids
Einecs: 306-235-8
Grade: Cosmetic Grade
Package: 1kg/5kg Aluminum Foil Bag or 25kg Fiber Drum.

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Product Description

Silk Amino Acids, CAS 96690-41-4, also called hydrolyzed silk, is a cosmetic ingredient obtained by hydrolyzing silk fibroin into low-molecular-weight amino acids and short peptides.

Synonyms: Hydrolyzed Silk Protein; Silk Peptide; Silk Hydrolysate; Mixed amino acids from silk; Sericin amino acids.

CAS: 96690-41-4.

It is a white to off-white or faint-yellow powder that is completely soluble in water.

It is rich in glycine, alanine and serine, similar to the amino acid structure of human skin.

It has a protein content of not less than 90.0% on a dry basis and total nitrogen of not less than 14.5%.

It penetrates the hair cuticle to repair damage and improves moisture retention and shine in hair care.

It provides a smooth, soft, silky skin feel and reduces the drying effect of surfactants in cleansers.

It is used in shampoos, conditioners, hair masks, lotions, creams and serums.

It is used in foundations, mascaras and lipsticks to improve texture and skin adhesion.

It is compatible with anionic, cationic and non-ionic surfactants.

It is a low-molecular-weight fraction that is water-soluble and penetrates better than higher-molecular-weight hydrolyzed silk protein.

It is fully biodegradable and environmentally friendly.

Confirm appearance, odor, total nitrogen, protein content, pH, loss on drying, ash, solubility, heavy metals, arsenic, total plate count and yeast/mold.

Store in a cool, dry, well-ventilated area at room temperature, away from excessive heat.

Keep the container tightly sealed immediately after use, as the powder is highly hygroscopic.

Confirm packaging with the requested quantity and destination requirements.

The page is an RFQ entry point and does not state stock, price, MOQ or fixed lead time.

For an RFQ, state the intended use, required grade and specification, quantity, packaging, destination and document needs.

FAQ - Technical & Supply Chain

Q:
What is Silk Amino Acids CAS 96690-41-4?

A: Silk Amino Acids CAS 96690-41-4 is a cosmetic ingredient obtained by hydrolyzing silk fibroin into a low molecular weight mixture of amino acids and short peptides. It is also listed as Protein hydrolyzates, silk and is rich in glycine, alanine, and serine.
Q:
How are Silk Amino Acids different from hydrolyzed silk protein?

A: Hydrolyzed silk protein generally refers to higher molecular weight peptides that can form a surface film, while Silk Amino Acids undergo greater hydrolysis to a smaller size. This smaller fraction is water-soluble and better suited to penetrating the hair shaft and conditioning the outer layers of skin.
Q:
What cosmetic applications are suitable for this ingredient?

A: It is used in shampoos, conditioners, hair masks, skin care emulsions, serums, and nail products. In formulations it contributes a silky skin feel, water retention, and conditioning benefits without a heavy or sticky film.
Q:
What are the main composition and quality parameters?

A: The product is typically a white to off-white powder with high glycine, alanine, and serine content. Cosmetic grades commonly report protein content on a dry basis around 90% or higher, total nitrogen around 14.5% or higher, pH about 5-7 in solution, and complete water solubility.
Q:
What is the correct CAS and EC number for Silk Amino Acids?

A: The INCI material is commonly identified as CAS 96690-41-4 and EC 306-235-8. Some supplier pages use a near variant CAS, but the Cosing/INCI listing and many cosmetic suppliers use 96690-41-4.

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