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High-solids, solvent-borne unsaturated polyester resin designed for excellent flow and leveling in coil coating systems.
Offers balanced reactivity for efficient curing at typical coil line speeds and temperatures (230–260 °C).
Delivers superior flexibility and impact resistance on pre-painted metal substrates.
Provides outstanding gloss retention and color stability under UV exposure and humid conditions.
Compatible with standard coil coating crosslinkers including melamine-formaldehyde and TGIC-free alternatives.
Architectural coil coatings for roofing, wall panels, and façade systems.
Prefinished metal for HVAC ductwork and appliance housings.
Automotive trim and under-hood components requiring durable exterior finishes.
Industrial metal furniture and agricultural equipment coatings.
General-purpose high-performance pre-painted steel and aluminum coils.
| Chemical Type | Unsaturated polyester resin |
| Product Form | Liquid, solvent-borne |
| Appearance | Clear to pale yellow viscous liquid |
| Solids Content (wt %) | ~75–78% |
| Viscosity (mPa·s, 25 °C) | 1,800–2,500 |
| Acid Value (mg KOH/g) | 12–16 |
| Primary Applications | Coil coating topcoats and primers |
| Key Features | High solids, fast cure, excellent flexibility & weatherability |
Q1: What is the primary function of ROSKYDAL K 40 T in polyester resin systems?
A: ROSKYDAL K 40 T functions as a reactive diluent and viscosity modifier, enabling improved processability while maintaining crosslink density and final film performance in unsaturated polyester resins.
Q2: Is ROSKYDAL K 40 T compatible with styrene-based unsaturated polyester formulations?
A: Yes, it is fully miscible with styrene and commonly used to partially replace styrene in low-VOC or reduced-emission polyester resin systems without compromising reactivity or cure profile.
Q3: How does ROSKYDAL K 40 T influence the mechanical properties of cured polyester coatings or composites?
A: It contributes to balanced flexibility and hardness in the cured network, supporting good impact resistance and adhesion while helping retain tensile strength and chemical resistance typical of high-performance polyester systems.
Q4: Can ROSKYDAL K 40 T be used in food-contact compliant polyester applications?
A: While ROSKYDAL K 40 T is designed for industrial coating and composite applications, its suitability for food-contact use depends on the full formulation and regulatory evaluation by the end-user — it is not pre-approved for such applications out-of-the-box.
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E-mail: wangxingqiang@ericwchem.com
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Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China
