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 99% (CAS 96692-41-4) is a premium, water-soluble glycoprotein hydrolysate utilizing its low molecular weight for deep penetration in hair and skin care formulations. Chemically derived from natural raw silk (Bombyx mori), this fine white powder acts as a potent hygroscopic agent, capable of retaining moisture and improving the elasticity of the stratum corneum. As a concentrated mixture rich in Glycine, Alanine, and Serine, it is extensively integrated into shampoos, conditioners, and lotions to provide a silky, non-sticky feel and repair damaged hair cuticles. We ensure bulk supply capabilities for this material, providing access to competitive factory pricing and customized specifications to meet specific nitrogen content and molecular weight requirements (e.g., <1000 Da). Full technical documentation, including MSDS, TDS, COA, is available to support compliance and safety protocols.

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 (also known as Hydrolyzed Silk) are obtained by the hydrolysis of silk fibers. Unlike high molecular weight silk proteins that form films on the surface, Silk Amino Acids have a very low molecular weight (typically < 1000 Daltons). This allows them to penetrate the hair shaft and the upper layers of the epidermis.

Our product is characterized by a high content of Alanine, Glycine, and Serine, which are similar to the amino acid structure of human skin. It exhibits excellent hygroscopicity (moisture-holding capacity), providing a silky, non-sticky feel to cosmetic formulations.

1 Physicochemical Properties

2 Applications

3 Storage Conditions

4 Safety Precautions

Physicochemical Properties

The following specifications represent our standard Cosmetic Grade export quality (High Purity 99% Powder):

Property	Specification / Value
Appearance	White to off-white or faint yellow powder
Odor	Characteristic (Mild to None)
Total Nitrogen	≥ 14.5%
Protein Content (Dry Basis)	≥ 90.0%
pH Value (10% Solution)	5.0 – 7.0
Loss on Drying	≤ 5.0%
Residue on Ignition (Ash)	≤ 4.0%
Solubility	Completely soluble in water
Heavy Metals (Pb)	≤ 10 ppm
Arsenic (As)	≤ 2 ppm
Total Plate Count	≤ 1000 cfu/g
Yeast and Mold	≤ 100 cfu/g

Applications

Silk Amino Acids are highly versatile and compatible with anionic, cationic, and non-ionic surfactants. Common dosage is 0.5% – 2.5%.

Hair Care (Shampoos, Conditioners, Hair Masks):
- Penetrates the hair cuticle to repair damage.
- Improves moisture retention and adds a natural shine.
- Reduces frizz and improves manageability.
Skin Care (Lotions, Creams, Serums):
- Excellent moisturizer due to its ability to bond with water.
- Provides a smooth, soft, “silky” tactile feel to the skin.
- Non-irritating, suitable for sensitive skin formulations.
Color Cosmetics:
- Used in foundations, mascaras, and lipsticks to improve texture and skin adhesion.
Cleansers:
- Reduces the drying effect of surfactants in body washes and facial cleansers.

Storage Conditions

Hygroscopic Nature: Silk Amino Acids highly absorb moisture from the air. It is critical to keep the container tightly sealed immediately after use.
Environment: Store in a cool, dry, and well-ventilated area.
Temperature: Stable at room temperature, but avoid excessive heat.
Shelf Life: 24 months from the production date in original unopened packaging.

Safety Precautions

General Safety: This product is a non-toxic, non-hazardous cosmetic ingredient derived from natural sources.
Inhalation: As it is a fine powder, avoid breathing dust. Use a standard dust mask during handling to prevent respiratory irritation.
Skin/Eye Contact: Generally non-irritating. However, in case of direct contact with pure powder in eyes, flush gently with water.
Biodegradability: The product is fully biodegradable and environmentally friendly.

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.

Ordering & Documentation

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