September 7, 2026 Kester R231 Solder Paste for Long Stencil Print Life
Kester R231 Solder Paste is a mildly activated rosin (RMA) formulation specifically engineered to deliver exceptionally long stencil and print life during printed circuit board assembly. Developed by Kester, this high-performance solder paste maintains its chemical activity and printing characteristics for extended manufacturing shifts.
Key Advantages of R231 Solder Paste
Designed for surface mount technology (SMT) processes that demand extended bench time and consistent deposition, this RMA paste offers clear operational benefits:
- Maintains stable printing performance and viscosity for up to 8 hours on the stencil (depending on ambient temperature and humidity).
- Mildly activated rosin chemistry provides reliable oxide removal and consistent solder wetting.
- Resists drying out during prolonged operational pauses on high-volume assembly lines.
- Ensures uniform paste release and repeatable volume transfer across fine-pitch apertures.
Technical Specifications and Application Parameters
Maintaining stable paste rheology throughout long production runs reduces defects and minimizes stencil cleaning intervals. Implementing Kester R231 Solder Paste guarantees robust joint integrity and stable performance across diverse electronic manufacturing setups.
| Technical Parameter | Specification Details |
|---|---|
| Flux Chemistry | RMA (Mildly Activated Rosin) |
| Stencil Life | Up to 8 Hours (environment dependent) |
| Application Method | Stencil Printing / SMT Assembly |
| Flux Activity | Stable rosin-based oxide reduction |
| Process Stability | Extended open time on stencil |
Conclusion
Achieving stable print transfer and long stencil life in SMT assembly is straightforward with Kester R231 Solder Paste. For technical datasheets, procurement, or direct engineering support, please reach out via Contact – LORIOT INDUSTRIAL.
