R520A Solder Paste, Sn96.5Ag3.0Cu0.5, Water-Soluble, Lead-Free, 600g Cartridge
Kester R520A is a lead-free, organic acid, water-soluble solder paste formula specifically designed for use with the higher temperature Pb-Free alternative soldering alloys such as Sn96.5Ag3.0Cu0.5 (SAC Alloys). The solder paste exhibits long stencil life and tack time while still delivering exceptional solderability to a wide variety of metallic substrates. R520A was formulated to release consistently from the stencil for those critical fine pitch applications (0.5 mm/20 mils) with anti-slump characteristics and preferred solder deposit definition. The activator package in this formula is extremely aggressive, providing superior wetting to OSP-coated and Immersion Gold over Electroless Nickel (ENIG) boards. R520A is an extremely stable, water-soluble formula.
Performance Characteristics:
- Lead-free and water soluble
- Print speed up to 150 mm/sec (6 in/sec)
- Stable tack life to long stencil life
- Consistent printing over a range of temperatures and humidities
- Excellent wetting onto Ag/Pd leaded components
- Reduces scrap due to less paste dry out
- Residues easily removed with hot DI water
- Classified as ORH0 per J-STD-004
Standard Applications
- 89.5% Metal - Stencil Printing
- 89.9% Metal - Enclosed Head Printing
RoHS Compliance
This product meets the requirements of the RoHS (Restriction of Hazardous Substances) Directive, 2002/95/EC Article 4 for the stated banned substances.
Availability
Kester R520A is available in the Sn96.5Ag3.0Cu0.5 alloy with Type 3 powder. Type 3 powder mesh is recommended, but different powder particle size distributions are available for standard and fine pitch applications. The appropriate combination depends on process variables and the specific application.
Cleaning
R520A residues are best removed using automated cleaning equipment (in-line or batch) within 24 hours of soldering. De-ionized water is recommended for the final rinse. Water temperatures should be 49 to 60 °C (120 to 140 °F). In addition, Kester's 5768 Bio-Kleen saponifier can also be used in a 1 to 2% ratio for aqueous cleaning systems.