In recent years, JiajinYuan has continuously increased investment in Solder Paste quality control capabilities, systematically integrating quality control nodes originally scattered across various links into 21 standardized inspection processes covering the entire lifecycle of R&D, production, warehousing, and delivery. These processes cover multiple dimensions including online monitoring of alloy powder particle size distribution D50/D90, retesting of rosin carrier acid value and softening point, dynamic tracking of Solder Paste Viscosity and slump rate, image analysis of post-reflow wetting angle and solder climb height, dual XRF verification of halogen content, comparison of ion chromatography residue conductivity, and pressure testing of SMT placement machine adaptability, ensuring that each batch of solder paste maintains high consistency in physical performance, chemical purity, and process adaptability.

At the specific product level, its main halogen-free and lead-free high-temperature solder paste series, such as LFP-JJY5RQ-0307T4 and LFP-JJY5RNTT-305, rely on T3/T4 grade fine classification control of 0307 and 305 alloy powders, achieving nearly 100% solder climb coverage in QFN/DFN fine-pitch device soldering, while controlling ROL0 level residues to a transparent state without white haze, meeting application scenarios with stringent requirements for solder joint cleanliness and long-term reliability such as communication equipment, high-end laptops, and fingerprint locks. For low-void thermal management needs in automotive lighting, LFP-JJY5RR-0307, through a zero-halogen formula and special Flux compounding, stably controls the void rate within the industry-recognized 5% threshold, and has been batch-applied to LED automotive lighting module production lines.

For the emerging laser welding process, JiajinYuan has simultaneously launched two specialized series: LFP-JJY5RLJ-305 and LFP-JJY5RLJB-4258. While adapting to dispensing with pneumatic valves, screw valves, and jet valves, they also balance suppression of solder ball defects and low-temperature thermal shock resistance. The latter adopts a Sn42Bi58 alloy system paired with T5 grade ultra-fine powder, compressing the soldering temperature window to the 160℃–185℃ range, greatly reducing the risk of damage to heat-sensitive components. Water-washable products LFP-JJY5RW1-0307 and LFP-JJY5RW5-0307 achieve one-time cleaning compliance with room-temperature deionized water while ensuring soldering strength, significantly reducing the overall post-processing cost of PCBA.

All solder paste models strictly implement closed-loop management from incoming inspection of alloy base materials, batch retention of rosin carriers, temperature control curve recording during mixing, monitoring of standing aging time, verification of viscosity attenuation cycle, to the final 24-hour constant temperature aging test before shipment. Each batch is accompanied by a unique ID quality file, supporting reverse traceability from the solder paste batch to the corresponding alloy powder supplier batch number and rosin batch number, truly transforming solder paste quality control from result sampling inspection to a new industrial quality control paradigm with controllable processes, traceable data, and accountable responsibilities.