LW-9229A/B: Crack-Resistant Room Temp Cure Epoxy for 10-35kV CT/PT
Insulation & Outdoor Encapsulation
UL-Certified | Pre-Mixed Fillers | Superior Dielectric Strength
Engineered for outdoor electrical
insulation in Current Transformers
(CT) and Potential Transformers (PT), this modified BPA
epoxy system delivers crack-resistant encapsulation for
10-35kV terminal posts, bushings, and transformer components.
With pre-mixed fillers in both resin (LW-9229A) and
hardener (LW-9229B), it ensures consistent thermal shock
resistance and long-term durability in harsh environments.
Key Advantages
Crack Resistance: Withstands thermal cycling for outdoor
applications.
High Dielectric Strength: Critical for 10-35kV
insulation systems.
Pre-Mixed Fillers: Simplified processing, no weighing errors.
Room Temperature Cure: Energy-efficient transformer
manufacturing.
Moisture & Chemical Resistance: Protects CT/PT
units from environmental degradation.
Applications
Ideal for:
10-35kV sealed terminal posts
CT/PT transformer potting & coil encapsulation
Outdoor bushings, insulators, switchgear
High-voltage electrical insulation components
Processing Methods
| Method | Benefit |
|---|
| Vacuum Gravity Casting | Bubble-free encapsulation for complex geometries. |
| Automatic Pressure Gelation (APG) | High-yield production of crack-resistant parts. |
Critical Properties
| Property | Value/Description |
|---|
| Filler Status | Pre-mixed in resin & hardener |
| Dielectric Strength | >22 kV/mm (ASTM D149) |
| Thermal Shock Resistance | Excellent (1,000+ cycles, IEC 60216) |
| Crack Resistance | Optimized for outdoor exposure |
| Viscosity | Slurry liquid for deep gap filling |
| Certification | UL 94 V-0 (Flame Retardant) |
Formulation Guide
| Component | Product | Proportion |
|---|
| Epoxy Resin | LW-9229A | 100 pbw |
| Hardener | LW-9229B | 100 pbw |
| Colorant | LC-Series* | 1 pbw |
| *Color paste optional for UV-stable pigmentation. |
Why Choose LW-9229A/B?
This electrical-grade epoxy combines BPA’s structural
strength with pre-mixed fillers for unmatched crack
resistance in outdoor applications. Its slurry
viscosity ensures perfect gap filling for CT/PT
windings, while room temperature curing reduces
production costs. Ideal for 10-35kV terminal
posts and transformer encapsulation, it delivers
lifelong moisture resistance and dielectric
performance under thermal cycling.
Advantage
Package Image
Shipment image
Example application image
