Cosmetic Sodium Acetate Trihydrate

Cosmetic Sodium Acetate Trihydrate for Skincare Formulations — High-Purity pH Buffer Solution

Cosmetic Sodium Acetate Trihydrate (CAS No. 6131-90-4) is a precision-grade buffering and pH-regulating ingredient widely used in professional cosmetic manufacturing. Produced by Shanxi Zhaoyi Chemical Co., Ltd. — a company that has been making acetate chemicals for more than 30 years. This product is ≥99% pure, has no heavy metals, and has a stable pH of 5% in water between 7.5 and 9.0. It can be produced at a rate of 150,000 tonnes per year. Flexible packaging comes in 25 kg bags or 1,000 kg tonne bags to meet the needs of both small samples for research and large-scale production.

Technical Specifications

What Is Cosmetic Sodium Acetate Trihydrate?

The molecular weight of sodium acetate trihydrate (CH 3 COONa·3H 2 O) is 136.08, and its specific gravity is 1.45. It is a white, crystalline substance. It melts at 58°C and breaks down quickly in water and alcohol, which makes it useful in cosmetic solutions that contain water.

It is more than just a salt , as a sodium acetate trihydrate cosmetic grade . In the recipe it serves as a pH regulator, buffer stabilizer and light moisturizing auxiliary at the same time. It’s ideal for use in leave-on and rinse-off products for all skin types, thanks to its moderate, non-irritating profile.

Core Applications in Cosmetic Formulations

It is best known for being a sodium acetate buffer that is used in cosmetics, where stable pH levels are important for safety and effectiveness.

Moisturising skin care products—In serums, essences, and lotions, it keeps the formulation's pH at the right level, protecting active ingredients from breaking down and making sure the acidity is good for the skin.

Creams and emulsions: The buffering ability keeps the emulsion system from separating into two parts when the pH changes or the temperature changes while it is being stored.

Shampoos and Conditioners: Sodium acetate pH buffer is used in skin care and hair care to keep the acidic environment that is good for the head and to make it easier for ingredients to work together in systems that are high in surfactants.

Stabilising Raw Materials: This method can also be used to change and keep the pH of different amounts of makeup raw materials stable before they are mixed. This makes the final products less likely to vary from batch to batch.

It dissolves quickly and easily in water, so it can be added at any stage of the production process, whether it's to make the aqueous phase or to change the pH after the blend has been made.

Cosmetic Sodium Acetate Trihydrate vs Other Products

Quality Control Standards

Sourcing cosmetic-grade ingredients requires confidence in testing rigor. Every batch of our cosmetic sodium acetate trihydrate is evaluated against a comprehensive set of QC indicators.

Assay Purity: 99.0% - 101.0% on a dry basis by non-aqueous titration. The narrow span guaranties constant buffer performance from batch to batch in manufacturing.

Lead (Pb) ≤2 ppm, Arsenic (As) ≤2 ppm, and Mercury (Hg) ≤1 ppm were all below the limits set by ICP-MS for Heavy Metal Control. These rules are in line with widely recognised standards for makeup safety and protect the end users.

There is ≤0.0003% iron (internal specification) and ≤5 ppm iron (QC level). Because too much iron can cause white creams and gels to turn darker through oxidation, this needs to be carefully controlled for the finished product to look good.

Matter that doesn't dissolve: no more than 0.05% so that clear serums or gels don't look gritty.

Adding substances: tested using permanganate time to make sure there aren't any reactive chemical impurities that might get in the way of sensitive actives like vitamin C or retinoids.

Verification of pH: For each batch, a 5% water solution is tested to make sure that the buffering is stable within the 7.5–9.0 range.

Third-party testing is supported, and full documentation — including COA, MSDS, and certification records — is available upon request.

Certifications & Compliance

Shanxi Zhaoyi Chemical Co., Ltd. holds internationally recognized management system certifications relevant to cosmetic ingredient supply:

• ISO 9001 — Quality Management System
• ISO 14001 — Environmental Management System
• ISO 45001 — Occupational Health and Safety Management System

Kosher Certification

Halal Certification (applicable grades)

The product is safe enough to use as a food addition and meets all the safety rules for makeup raw materials. Customers from all over the world are welcome and encouraged to do on-site factory audits.

After-Sales Service & Supply Support

Your production schedule matters. Here is what you can expect when working with us:

Guarantyd quality: full test reports are sent with every shipment. If heavy metals or dangerous impurities go over the agreed-upon limits, returns or replacements will be made without any conditions.

Technical answer: advice on how to change the pH and help with formulation sent within 24 hours of inquiry.

You can get free samples ranging from 500 g to 25 kg to help with your research and development and to make sure the formula works before you commit to large sales.

Certification documents: International compliance documents provided to meet your market's regulatory requirements.

Supply reliability: Shipment scheduling coordinated with your production plan. Standard lead time is 5–7 working days; stock orders can ship within 24 hours.

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FAQ

Q: What makes sodium acetate trihydrate suitable for cosmetic-grade use?

A：The product is very pure (>99%), strictly limited in heavy metals, and has been shown to work well with common recipe ingredients. Its mild, non-irritating nature and steady ability to buffer make leave-on skin products safe and effective.

Q: How does sodium acetate buffer work to buffer the pH of cosmetics?

A：Sodium acetate buffer in cosmetics works through its acetate/acetic acid equilibrium system. It is resistant to pH drift with the addition of modest quantities of acid or base and maintains formulations in the desired skin-safe range across the shelf life of the product.

Q: Can this product be used in rinse-off as well as leave-on formulations?

A: Yes. It works well with most skin types and won't irritate it, so it can be used in shampoos, conditioners, cleansers, toners, serums, and creams. Depending on how strong of a buffer you want, the normal concentration range is from 0.1 to 1.0%.

Q: What documents can you give for compliance?

A: We provide COA, MSDS, ISO certifications, Kosher and Halal certification papers and third party test results. Multilingual versions are offered for the main export markets.

Q: What is the minimum order quantity, and are samples available?

A: Free samples 500 g-25 kg may be provided for formula testing. Commercial orders are available in both small volume and large amounts. Please contact us to check the current MOQ as per your exact needs.

Q: How should cosmetic-grade sodium acetate trihydrate be stored?

A: Store in a dry, well-ventilated warehouse, away from heat and moisture. Keep away from incompatible or harmful materials. Handle in transit to avoid damage to packaging which may result in absorption of moisture.

Contact Us

Ready to source high-purity Cosmetic Sodium Acetate Trihydrate for your next formulation? Contact us at sxzy@sxzhaoyi.com  — samples and technical support available within 24 hours.