SM-690 is a premium modified epoxy resin in Kukdo’s SM series, designed for precision casting and high-clarity encapsulation. It features excellent optical clarity and low-shrinkage curing, adapting to fine-structure molding needs.
High-clarity formula - High optical clarity after curing, no obvious yellowing
All-liquid active system - 100% active ingredients, ready for use without dilution
Low-shrinkage curing - Extremely low curing shrinkage, high dimensional accuracy
Excellent weather resistance - UV aging resistance, stable for outdoor use
Convenient processing characteristics - Low viscosity for easy pouring, minimal bubble entrapment, high molding efficiency
Precision casting products - Manufacturing of transparent optical components and fine mold prototypes
Electronic component encapsulation - Transparent packaging protection for visually identifiable electronic components
Decorative material molding - Preparation of high-end transparent decorative parts and artistic casting products
Sensor encapsulation - Sealing protection for optical sensors and transparent detection elements
Automotive optical components - Casting molding of automotive transparent lenses and indicator covers
| Appearance | Colorless Transparent Liquid |
| Epoxy Equivalent (g/eq) | 215-235 |
| Viscosity (25℃, cps) | 2800-4800 |
| Color (G) | ≤3 |
| Hydrolyzable Chlorine (ppm) | ≤250 |
| Solid Content (%) | 100 |
| Density (20℃, g/cm³) | 1.13-1.15 |
| Glass Transition Temperature (Tg, ℃) | 105-115 |
| Curing Shrinkage (%) | ≤0.2 |
| Light Transmittance (400-760nm) | ≥90% |
| UV Aging Resistance (1000h) | No obvious yellowing |
| Hardness (Shore D) | ≥80 |
Contact With Us:
E-mail: wangxingqiang@ericwchem.com
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Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China