In the evolving world of UV-curable formulations, particularly for personal care and high-performance coatings, the demand for safer, purer, and more skin-friendly raw materials is stronger than ever. Responding to this need, Sinocure Chemical Group proudly introduces SINOMER® UVU6256 NM—a specialized, MEHQ-free aliphatic polyurethane acrylate (PUA) oligomer engineered to set new standards in UV nail gel applications and other formulations where inhibitor sensitivity is a concern.
Methyl ethyl hydroquinone (MEHQ) is a common polymerization inhibitor added to acrylic monomers and oligomers to enhance shelf stability. However, in applications involving direct and prolonged skin contact—such as UV-cured nail gels—the presence of MEHQ can raise concerns regarding potential sensitization, odor, and long-term biocompatibility. Formulators seeking cleaner, low-irritation, and consumer-friendly products are increasingly prioritizing MEHQ-free alternatives.
SINOMER® UVU6256 NM is developed precisely for this purpose, offering a safer foundation without compromising performance.
MEHQ-Free & Low Odor: Specifically formulated without MEHQ, making it ideal for personal care and sensitive applications. Its low odor profile enhances the user and applicator experience.
Excellent Flexibility & Durability: As a difunctional aliphatic PUA, it delivers outstanding flexibility (>200 folds over a 0.1mm mandrel) and impact resistance, resulting in durable, crack-resistant nail gels and flexible coatings.
Superior Wetting & Adhesion: Exhibits excellent substrate wetting properties, ensuring smooth application and strong adhesion (Grade 2) on various surfaces without the need for additional wetting agents.
Aliphatic Structure for Good Yellowing Resistance: The aliphatic backbone provides inherent resistance to yellowing under UV exposure, helping manicures and clear coatings maintain their clarity and color fidelity over time.
High Purity & Consistency: With a solid content ≥99% and controlled viscosity, it ensures reliable processing and predictable performance in formulations.
Appearance | Colorless to Slightly yellow transparent liquid |
Color (Fe-Co) | ≤1 |
Viscosity (cps @ 40°C) | 150,000 - 170,000 (NDJ-79 viscometer) |
NCO Value (mg KOH/g) | 0 |
Solid Content (%) | ≥99 |
Refractive Index (25°C) | 1.4794 ± 0.005 |
Density (g/ml) | 1.12 ± 0.02 |
Tested in a basic formulation (100:3 ratio with Photoinitiator 1173), SINOMER® UVU6256 NM demonstrates the following key characteristics:
Flexibility: >200 folds
Adhesion: Grade 2
Gloss (60°): 91.7°
Pencil Hardness: <6B (indicating a very flexible film)
Yellowing Resistance: Fair
Wetting Property: Good
This oligomer is uniquely suited for formulations where skin contact, flexibility, and purity are paramount:
UV-Cured Nail Gels & Coatings: The primary application. Its combination of flexibility, adhesion, and MEHQ-free nature makes it a safe and reliable base for gel polishes, base coats, top coats, and overlay systems.
Sensitive Skin-Contact Formulations: Suitable for other personal care or dermatological UV-curing products where inhibitor sensitivity must be minimized.
Flexible Industrial Coatings: Can be used in vacuum metallization coatings on plastic or metal, and in wood or floor coatings where excellent flexibility and substrate wetting are required.
By choosing SINOMER® UVU6256 NM, formulators can:
Develop next-generation, consumer-safe UV nail gels with a cleaner ingredient profile.
Reduce the risk of allergic reactions or sensitization associated with traditional inhibitors.
Achieve an optimal balance between application performance (wetting, leveling) and end-use properties (flexibility, durability, gloss).
Streamline formulations by leveraging its inherent wetting ability, potentially reducing additive load.
At Sinocure Chemical Group, we are committed to providing innovative solutions that align with market trends and stricter safety standards. SINOMER® UVU6256 NM exemplifies this commitment—offering a specialized, high-performance material that empowers brands to create safer, superior, and more competitive UV-curable products.
Package: 20 kg or 200 kg/drum.
Explore the potential of MEHQ-free chemistry for your next breakthrough formulation.
For technical data sheets, samples, or formulation support, please contact our team.
