What is Homosalate CAS 118-56-9?

Homosalate CAS 118-56-9 is an oil-soluble liquid UVB filter with molecular formula C16H22O3, molecular weight about 262.34, and EINECS 204-260-8. It is also known as homomenthyl salicylate or 3,3,5-trimethylcyclohexyl salicylate.

Does Homosalate provide broad-spectrum UV protection on its own?

No. Homosalate mainly absorbs UVB radiation in the 295-315 nm range and is not a broad-spectrum filter by itself. Sunscreen and cosmetic formulations typically combine it with UVA filters such as avobenzone, zinc oxide, or other approved actives for balanced protection.

Why is Homosalate used as a solvent for avobenzone and other solid UV filters?

Homosalate is liquid at room temperature and oil-soluble, so it helps dissolve crystalline filters that are otherwise difficult to keep in solution. This can reduce recrystallization risk and support more uniform distribution of other UV absorbers in the oil phase.

Why does the liquid form of Homosalate matter in formulation?

Because it is a liquid rather than a powder, it is easier to incorporate into emulsions, oils, and sunscreen concentrates. It also contributes spreadability, although formulators often balance its oily feel with lighter esters or other cosmetic ingredients.

What are the main formulation roles of Homosalate?

Homosalate functions primarily as a UVB absorber and secondary solvent/carrier in sunscreens and sun-care cosmetics. It is usually used as part of a filter system rather than as the sole active, with the final blend selected for target SPF, skin feel, stability, and regulatory limits.

Homosalate CAS 118-56-9

Homosalate CAS 118-56-9 is an oil-soluble organic ester chemically defined as 3,3,5-trimethylcyclohexyl 2-hydroxybenzoate , functioning primarily as a UV-B absorber in sunscreen formulations and a solubilizer for solid UV filters. Also known as Homomenthyl salicylate or HMS, this clear, colorless to pale yellow liquid is utilized to protect skin from solar erythema in personal care products and serves as a solvent carrier to stabilize crystalline photo-protectors like Avobenzone in complex emulsions. We provide professional access to this material with competitive factory pricing and the ability to meet customized specifications for various manufacturing requirements. Our commitment to technical transparency ensures that every shipment is accompanied by comprehensive MSDS, TDS, COA documentation to support your quality assurance protocols, and we maintain capacity for consistent bulk supply to facilitate large-scale industrial operations.

CAS: 118-56-9
Synonyms: Homomenthyl salicylate, HMS, 3,3,5-Trimethylcyclohexyl salicylate, m-Homomenthyl salicylate, Benzoic acid 2-hydroxy- 3,3,5-trimethylcyclohexyl ester
Einecs: 204-260-8
Molecular Formula: C16H22O3
Grade: Cosmetic / Sunscreen UV Filter Grade
Package: 200 kg drum / 1000 kg IBC (customizable)

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Product Description

1 1. Physical and Chemical Properties

2 2. Applications: More Than Just UVB Protection

3 3. Safety and Regulatory Awareness

4 4. Storage and Logistics

1. Physical and Chemical Properties

Homosalate is an organic ester formed from salicylic acid and 3,3,5-trimethylcyclohexanol. Unlike many UV filters that come as chalky powders, HMS is a liquid, which is a massive advantage for processing.

Property	Specification / Description
CAS Number	118-56-9
INCI Name	Homosalate
Appearance	Clear, colorless to pale yellow liquid
Odor	Mild, characteristic minty/aromatic scent
Solubility	Insoluble in water; Miscible with paraffin, vegetable oils, and alcohols
Boiling Point	Approx. 161-165°C (at reduced pressure)
Specific Gravity	1.049 – 1.053 g/cm³
UV Spectrum	Primarily UVB (295–315 nm protection)

Formulator’s Note: Its oily nature gives it excellent spreadability, but it can feel “greasy” if used at maximum loads without lighter esters to balance the skin feel.

2. Applications: More Than Just UVB Protection

While categorized as a UVB filter, Homosalate is rarely used alone. Its applications are strategic:

The Solubilizer: This is its primary superpower. Solid crystalline UV filters (like Avobenzone or Bemotrizinol) are notoriously hard to keep dissolved. If they recrystallize, the SPF drops. Homosalate acts as an effective solvent to keep these solids in solution, ensuring the product remains stable on the shelf.
Broad Spectrum Sunscreens: It is almost always paired with UVA filters to create broad-spectrum protection.
Water-Resistant Formulations: Because it is hydrophobic (water-repelling), it helps formulations resist washing off during swimming or sweating.
Hair Care & Color Cosmetics: Used in sprays and foundations to provide incidental UV protection to hair and skin.

3. Safety and Regulatory Awareness

Homosalate is safe when used correctly, but it is currently under the regulatory microscope, which buyers must be aware of.

Handling: As a raw material, it is an irritant. Workers should wear protective eyewear and gloves. Avoid inhalation of mists if the product is being sprayed during manufacturing.
Regulatory Limits:
- USA (FDA): Approved up to 15%.
- EU: Recent updates have tightened restrictions due to potential endocrine concerns. Always check the latest EU Cosmetics Regulation amendments before formulating for the European market (current trends suggest lower maximum concentrations, often around 7.34% or 10% depending on the final product type).
Skin Sensitivity: It is generally well-tolerated, but like all salicylates, it should be used with caution in products designed for hyper-sensitive skin.

4. Storage and Logistics

One of the benefits of Homosalate is its stability compared to other UV filters. However, proper storage is vital to prevent oxidation.

Packaging: typically shipped in 200kg plastic drums or 1000kg IBC totes.
Environment: Store in a cool, dry, well-ventilated area. Keep away from direct sunlight.
Temperature: It does not freeze easily, but cold temperatures can increase viscosity, making pumping difficult. Room temperature (15°C – 25°C) is ideal.
Shelf Life: High-quality HMS typically has a shelf life of 24 months if the drum seals remain intact.

FAQ - Technical & Supply Chain

Q:
What is Homosalate CAS 118-56-9?

A: Homosalate CAS 118-56-9 is an oil-soluble liquid UVB filter with molecular formula C16H22O3, molecular weight about 262.34, and EINECS 204-260-8. It is also known as homomenthyl salicylate or 3,3,5-trimethylcyclohexyl salicylate.
Q:
Does Homosalate provide broad-spectrum UV protection on its own?

A: No. Homosalate mainly absorbs UVB radiation in the 295-315 nm range and is not a broad-spectrum filter by itself. Sunscreen and cosmetic formulations typically combine it with UVA filters such as avobenzone, zinc oxide, or other approved actives for balanced protection.
Q:
Why is Homosalate used as a solvent for avobenzone and other solid UV filters?

A: Homosalate is liquid at room temperature and oil-soluble, so it helps dissolve crystalline filters that are otherwise difficult to keep in solution. This can reduce recrystallization risk and support more uniform distribution of other UV absorbers in the oil phase.
Q:
Why does the liquid form of Homosalate matter in formulation?

A: Because it is a liquid rather than a powder, it is easier to incorporate into emulsions, oils, and sunscreen concentrates. It also contributes spreadability, although formulators often balance its oily feel with lighter esters or other cosmetic ingredients.
Q:
What are the main formulation roles of Homosalate?

A: Homosalate functions primarily as a UVB absorber and secondary solvent/carrier in sunscreens and sun-care cosmetics. It is usually used as part of a filter system rather than as the sole active, with the final blend selected for target SPF, skin feel, stability, and regulatory limits.

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