Relife RL-404S Solder Paste With Pusher 138°C Melting Point

Description

The Relife RL-404S Low Temperature Lead Free Solder Paste is a professional-grade soldering solution designed to meet the demanding needs of modern electronic repair and assembly. Offered by Baba Tools, a trusted name in high-quality repair equipment, this advanced syringe-type solder paste delivers reliable performance for technicians, engineers, and service centers working on delicate electronic components. Developed by RELIFE, the RL-404S model is engineered for stable soldering at a low melting point of 138°C, making it ideal for sensitive circuit boards and high-value devices where heat control is essential.

This solder paste is supplied in a 10CC syringe format that allows clean, controlled, and efficient application across a wide range of repair tasks. The syringe design supports even dispensing and reduces material waste, making it suitable for both fine-pitch components and broader solder joints. The paste contains ultra-fine solder particles ranging from 20 to 38 microns, enabling smooth flow and excellent adhesion during soldering operations. Its fine consistency supports uniform spreading and strong bonding on pads, pins, and contact surfaces.

Relife RL-404S is specially formulated for high-end motherboard repair, including mobile phones, tablets, laptops, industrial control boards, and other compact electronic systems. The low-temperature lead-free composition protects components from thermal stress while maintaining strong joint formation. This makes it particularly useful for BGA chip tin planting, SMT rework, chip soldering, LED patching, and connector restoration. The strong activity of the paste ensures effective wetting, allowing solder to bond evenly across surfaces for stable electrical connectivity.

One of the standout characteristics of this solder paste is its excellent wettability and long open time. Even after being exposed to air for up to 36 hours, the paste remains moist and workable, without negatively affecting soldering quality. This feature supports extended repair sessions and batch work environments. The no-clean formula ensures that no corrosive residue is left behind after soldering, eliminating the need for post-solder cleaning and protecting circuit integrity over time.

The RL-404S solder paste offers high resistance and strong welding ability, producing bright, full, and reliable solder joints. The flux content is carefully balanced at 9±0.5 Wi%, supporting consistent activation during heating while maintaining surface cleanliness. With a viscosity of approximately 178±10 Pa.s at 25°C, the paste maintains stable flow characteristics that support controlled placement and consistent joint formation across various applications.

Baba Tools supplies this solder paste with added usability in mind. Each package includes three free needles of different specifications along with a putter, allowing technicians to adapt the paste application for different component sizes and layouts. The reusable sealing plug ensures that the syringe remains airtight after use, extending shelf life and maintaining paste quality. When stored correctly at temperatures between 0 and 10°C, the solder paste retains its performance characteristics for professional use.

This product is suitable for a wide range of electronic repair and assembly scenarios. Common applications include sensors, wires, motors, fuses, connectors, metal shells, lighting components, electronic modules, SMT patches, BGA soldering, chip-level repairs, and LED assemblies. Its versatility makes it an essential item in electronics repair workshops, manufacturing units, and service centers that require dependable soldering materials.

Relife RL-404S solder paste is crafted for users who require consistency, stability, and performance without excessive heat exposure. The low melting temperature reduces the risk of board deformation, component damage, and pad lifting, especially on multilayer PCBs and compact designs. This makes it a valuable solution for advanced electronic repair tasks where quality and control are critical.

Backed by RELIFE engineering and distributed by Baba Tools, this solder paste reflects a commitment to dependable tools and materials for the electronics repair industry. Whether used for professional motherboard restoration, SMT rework, or detailed component soldering, the RL-404S provides a reliable solution that supports clean joints, strong connections, and long-term durability.

Product Specifications

• Brand: RELIFE

• Model: RL-404S

• Product Type: Low Temperature Lead Free Solder Paste

• Paste Format: Syringe Type

• Volume: 10CC

• Melting Temperature: 138°C

• Particle Size: 20–38 microns

• Flux Content: 9±0.5 Wi%

• Viscosity (25°C): 178±10 Pa.s

• Storage Temperature: 0°C to 10°C

• Cleaning Requirement: No-Clean

• Approximate Weight: 15g

• Application Areas: SMT repair, BGA soldering, chip soldering, LED patching, motherboard repair, sensors, connectors, motors, fuses, wires, electronic components

• Shelf Stability: Remains wet up to 36 hours after opening under proper conditions