BS 5625:1980

Foreword
Cooperating organizations
Specification
1. Scope
2. References
3. Classification of fluxes
4. Physical condition
5. Packaging and marking
6. Test methods
6.1 Test for fluxing efficiency
6.2 Test for corrosion
6.3 Determination of insulation resistance
6.4 Test for hardness and homogeneity of rosin-based
     fluxes
6.5 Determination of mould growth resistance
6.6 Determination of non-volatile matter in rosin-based
     fluxes (gravimetric method)
6.7 Determination of halide content
6.8 Determination of zinc content
6.9 Determination of ammonia content
6.10 Determination of the water-extractable acid
     content of rosin-based fluxes (volumetric method)
7. Purchasing requirements for each class of flux
7.1 Flux class 1, inorganic halides with or without
     inorganic acids
7.2 Flux class 2, phosphoric acid and derivatives
7.3 Flux class 3, halides of organic compounds
7.4 Flux class 4, organic acids
7.5 Flux class 5, activated rosins; 5a, activators
     containing halide; 5b, activators not containing
     halide
7.6 Flux class 6, non-activated rosins
7.7 Flux class 7, other organic compounds
Tables
1. Test materials and operating temperatures
2. Summary of purchasing requirements
Figures
1. Example of a jig for holding the sheet metal test
    piece
2. Dimensions of penetrator, die and blank-holder
3. Apparatus for the determination of insulation
    resistance
4. Apparatus for the determination of ammonia content

Specifies purchasing requirements and appropriate test methods for solid, liquid and paste fluxes for use in soldering or \'tinning\' with the soft solders listed in BS 219.