Kester NP545 Solder Paste Zero-Halogen, No-Clean

Product code: Kester NP545

Manufacturer: Kester

Package size: 500g

Shelf Life: 12 months

NP545 is a no-clean, zero-halogen solder paste formula designed for consistency and repeatability. NP545 consistently delivers paste transfer efficiencies of 0.55 to 0.50 AR. This paste is also fully capable of printing and reflowing 01005 components, even in air reflow, with minimal grasping behavior. NP545 is classified as ROL0 per IPC J-STD-004B. NP545 is has been developed as an SnPb alloy solder paste can use in backward applications and is thus fully compatible with soldering complex lead-free component on SnPb assemblies.


  • ROL0 per J-STD-004B
  • Zero-Halogen (none intentionally added)
  • Consistent print performance to 0.5AR
  • Excellent cosmetics and a clear residue
Property Value Test per Method
Initial Tackiness 35 grams J-STD-005, IPC-TM-650 2.4.44
Cold Slump Test Pass J-STD-005, IPC-TM-650 2.4.35
Solder Ball Test Pass J-STD-005, IPC-TM-650 2.4.43
Viscosity (typical) 1250 poise J-STD-005, IPC-TM-650 2.4.35
Hot Slump Test Pass    
Wetting Test Pass IPC-TM-650 2.4.45

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