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High-purity bisphenol-A based liquid epoxy resin with consistent molecular weight distribution.
Low viscosity (12,000–14,000 cP at 25°C) enabling excellent processability and wetting in composite formulations.
Superior thermal stability with glass transition temperature (Tg) of cured resin exceeding 120°C.
Excellent electrical insulation properties and low dielectric loss suitable for electronic encapsulation.
Reactive epoxide equivalent weight (EEW) of 184–190 g/eq, ensuring precise stoichiometric control during curing.
Electrical insulation coatings for transformers and reactors.
Encapsulation and potting compounds for power electronics and LED modules.
Structural adhesives in aerospace and automotive composites.
Matrix resin for filament-wound pressure vessels and FRP tanks.
High-performance laminates in printed circuit board (PCB) prepregs.
| Chemical Type | Bisphenol-A diglycidyl ether (DGEBA) |
| Product Form | Clear, pale yellow liquid |
| Appearance | Homogeneous, transparent, free of gel particles or sediment |
| Epoxide Equivalent Weight (EEW) | 184–190 g/eq |
| Viscosity (25°C) | 12,000–14,000 cP |
| Chlorine Content (Total Cl) | ≤ 700 ppm |
| Volatiles Content | ≤ 0.3 wt% |
| Storage Stability (25°C) | ≥ 12 months in sealed containers |
Q1: What is the primary functional role of YD-128SM in epoxy formulations?
A: YD-128SM functions as a reactive diluent and viscosity modifier, enabling improved processability without compromising the crosslink density or thermal stability of the cured network.
Q2: Is YD-128SM compatible with standard amine-based hardeners?
A: Yes, YD-128SM exhibits broad compatibility with aliphatic, cycloaliphatic, and aromatic amine hardeners, supporting consistent reactivity and full cure development across diverse formulation systems.
Q3: How does YD-128SM affect pot life and gel time compared to conventional bisphenol-A epoxy resins?
A: Due to its lower viscosity and monofunctional character, YD-128SM typically extends pot life and delays gel time relative to higher-molecular-weight epoxies—offering enhanced working window for casting, coating, or impregnation applications.
Q4: Can YD-128SM be used in high-gloss or low-shrinkage applications?
A: Yes—its controlled reactivity and low volatility support excellent surface aesthetics and reduced internal stress during cure, making it suitable for precision coatings, optical encapsulants, and decorative castings where dimensional stability and clarity are critical.
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E-mail: wangxingqiang@ericwchem.com
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