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Alcohol-based flux GSP-2533/RX

Recommended method of application
Wave soldering (spray and foam fluxing)

No Clean-Flux, alcohol-based
Di-carboxylic acids, synthetic resin, halogenide-free (WEEE/RoHS compliant)
Type ISO-9454: 1231 // DIN EN 61190-1-1 (acc. J-STD004) IEC: (REL0)

Cat.-No. 3060

Technical Data

Appearance/smell: colourless to reddish, clear liquid
Hazardous goods: Yes
Solids content: 2.5 wt.-%
Acid number: 22 – 25 mg KOH/g
Halogenide-free: Yes
Resinous: Yes
Available as concentrate: No
Density at 20 °C: 0.794 (+/-0.003) g/ml
Flash point: 12 °C
Durability: 12 months


GSP-2533/RX established 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 very 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. Practice has shown, that no washing is needed for PCBA properly soldered with this flux. The IC test with needle adapters generally completes without problems.Recommended thinner for GSP-2533/RX: BX-V (Part Number 1011).

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 behavior (very clean, high SIR)

Packaging units

Canister: 20 l