• Cleaning of flux residues

  • Special applications

  • Selective soldering

  • Cable assembling/Wire soldering

  • Manual assembling

  • Wave soldering: foam fluxing

  • Wave soldering: spray fluxing
Water- and alcohol-based flux
Flux for cable assembling
Cleaning agents
Otto's Original - Quality products since 1901

Alcohol-based flux


No clean, alcohol-based flux, synthetic resin, di-carboxylic
acids, halogen-free (WEEE/RoHS conformant)
Type // REL0 acc. ISO 9454 // DIN EN 61 190-1-1


Standard packaging units liter_20 20 L

Appearance:colorless to reddish, clear
Solids content:2.5 wt%
Density 20 °C:0.794 (+/- 0.003) g/cm³
Acid number:22 - 25 mg KOH/g
Activators/resin:synthetic resin with di-carboxylic acids
Solvents:short-chain alcohols
Flash point:12 °C
Durability:6 months

GSP-2533/RX proven over the course of many years, is S-250/FRO’s predecessor. Very good soldering results were achieved regardless of the respective type of system. The cleanliness is quite good. GSP-2533/RX is suitable as a wave-solder flux for foam and spray fluxing. It’s not recommended for selective or manual soldering. Please note the shelf life of 6 month.

In practice it has been shown that with the correct application, the washing of printed circuit boards soldered with this flux can be largely dispensed with. The IC test with needle adapters generally completes without problems.

Application (recommended): Wave soldering (foam and spray fluxing)

Customer added value:

  • Very good soldering properties (capillarity, wetting)
  • Broad process window (very high thermal stability, good activity over a long interval)
  • Very good residue behaviour (very clean, high SIR)

product overview

Questions about our products?
We will advise you by phone 06123 / 7046-0.