Kester High-Reliability Products Kester

Kester is a leading global supplier of assembly materials to the electronic assembly, component and microelectronic marketplaces. Its premium products include an array of basic and high-tech attachment materials, including traditional soldering chemicals, paste, wire and bar products.

  • 275 Flux-Cored Wire
  • NP505-HR Solder Paste
  • NF372-TB Soldering Flux
  • SELECT-10 Selective Soldering Flux
  • RF550 Rework Flux


Soldering made easy with high-reliability products for demanding applications.

Recently, manufacturers in the Electronic Assembly industry have expressed concern over no-clean flux residue and its influence on reliability. This concern has been heightened by miniaturization simultaneous with high-density board design trends.

To ensure high reliability, Kester has followed specific experimental procedures based on simple chemical fundamentals. These protocols discriminate two primary chemical mechanisms causing reliability failures: corrosion and electrochemical migration. Including industry standards and customer-specific testing, Kester is proud to present our series of chemically reliable products.

275 Flux-Cored Wire 

Part No. Description Category
426-280 No Clean, Leaded, Sn63Pb37, 2.2%, 0.025 in (0.60 mm), 275 Series Solder wire
488SO2751 No Clean, Leaded, Sn63Pb37, 2.2%, 0.031 in (0.80 mm), 275 Series Solder wire
488SO7604 No Clean, Leaded, Sn63Pb37, 1.1%, 0.015 in (0.40 mm), 275 Series Solder wire
SN6327550-062 No Clean, Lead Free,Sn63Pb37, 1.1%, 0.062 in (1.50 mm), 275 Series Solder wire
488SO2753 No Clean, Leaded, Sn63Pb37, 1.1%, 0.020 in (0.50 mm), 275 Series Solder wire
Sac305 products
10020328 No Clean, Lead Free, Sn96.5Ag03Cu.5, 1.1%, 0.025 in (0.60 mm), 275 Series Solder wire
488SO7871  No Clean, Lead Free, Sn96.5Ag03Cu.5, 2.2%, 0.031 in (0.80 mm), 275 Series Solder wire
488SO7863 No Clean, Lead Free, Sn96.5Ag03Cu.5, 2.2%, 0.020 in (0.50 mm), 275 Series Solder wire
488WA037 No Clean, Lead Free, Sn96.5Ag03Cu.5, 2.2%, 0.040 in (1.00 mm), 275 Series Solder wire
488SO7866 No Clean, Lead Free, Sn96.5Ag03Cu.5, 2.2%, 0.050 in (1.27 mm), 275 Series Solder wire
488SO7867 No Clean, Lead Free, Sn96.5Ag03Cu.5, 2.2%, 0.062 in (1.50 mm), 275 Series Solder wire
488SO6808 No Clean, Lead Free, Sn96.5Ag03Cu.5, 2.2%, 0.015 in (0.40 mm), 275 Series Solder wire
488SO7609 No Clean, Lead Free, Sn96.5Ag03Cu.5, 3.3%, 0.015 in (0.40 mm), 275 Series Solder wire
435-530 No Clean, Lead Free, Sn96.5Ag03Cu.5, 3.3%, 0.020 in (0.50 mm), 275 Series Solder wire
441-830 No Clean, Lead Free, Sn96.5Ag03Cu.5, 3.3%, 0.062 1 LB Spool, 275 Series Solder wire 
488SO617 No Clean, Lead Free, Sn96.5Ag03Cu.5, 2.2%, 0.025 in (0.60 mm), 275 Series Solder wire
488WA012 No Clean, Lead Free, Sn96.5Ag03Cu.5, 3.3%, 0.031 in (0.80 mm), 275 Series Solder wire
488WA020 No Clean, Lead Free, Sn96.5Ag03Cu.5, 3.3%, 0.025 in (0.60 mm), 275 Series Solder wire
488SO7623 No Clean, Lead Free, Sn96.5Ag03Cu.5, 2.2%, 0.010 in (0.25 mm), 275 Series Solder wire
K100ld products
488SO1315 No Clean, Lead Free, K100LD, 3.3%, 0.015 in (0.40 mm), 275 Series Solder wire
488SO1320 No Clean, Lead Free, K100LD, 3.3%, 0.020 in (0.50 mm), 275 Series Solder wire
488SO1350 No Clean, Lead Free, K100LD, 3.3%, 0.050 in (1.27 mm), 275 Series Solder wire
488SO1362 No Clean, Lead Free, K100LD, 3.3%, 0.062 in (1.50 mm), 275 Series Solder wire
488SO1331 No Clean, Lead Free, K100LD, 3.3%, 0.031 in (0.80 mm), 275 Series Solder wire
488SO1325 No Clean, Lead Free, K100LD, 3.3%, 0.025 in (0.60 mm), 275 Series Solder wire
488SO1310 No Clean, Lead Free, K100LD, 3.3%, 0.010 in (0.25 mm), 275 Series Solder wire


NP505-HR Solder Paste

Part No. Description Category
490-295 Lead-Free No-Clean Solder Paste, SAC305, Type 3, 600 Gram Cartridge Solder Paste
490-431 Zero-Halogen, No Clean, Lead-Free, Sn96.5Ag3.0Cu0.5 T3 88.5% 500g Jar Solder Paste
488SO5055 No Clean, Lead Free, Sn96.5Ag3.0Cu0.5, 88.5 %, T4, 50 g Jar Solder Paste
488SO5056 No Clean, Lead Free, Sn96.5Ag3.0Cu0.5, 88.5 %, T4, 60 g Cartridge Solder Paste




NF372-TB Soldering Flux

Part No. Description Category
488CH0372 NF372-TB 1 Gallon Halide Free Soldering Flux Solder Flux
488CH372 Flux Pen, Zero Halogen, No Clean Solder Flux
488CH0373 Xero Halogen, Low Solids, No Clean, Liquid, 5 Gal Solder Flux
488CH0374 Xero Halogen, Low Solids, No Clean, Liquid, 53 Gal Solder Flux
10061048 No Clean, Lead Free, Sn63Pb37 T4 89.3% 600g CRT Solder Flux


SELECT-10 Selective Soldering Flux

Part No. Description Category
488SO811 SELECT-10™ Selective Solder Flux, 1 gal. Flux
484-718 SELECT-10™ Selective Solder Flux, 5 gal. Flux
489-933 FLUX-PEN® Selective Solder No-Clean Flux Pen


RF550 Rework Flux

Part No. Description Category
488SO550 RF550 Rework No Clean Flux, 30g Syringe Flux