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Alcohol-based flux GSP-2533/RX/OVAP

Recommended method of application
Wave soldering (spray 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. 3545

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/OVAP 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 level of cleanliness is very good. The thermal stability is also very high and achieves good activity over a wide interval. GSP-2533/RX/OVAP is unsuitable for foam 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.

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