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SN42/BI57.6/AG0.4 LEAD-FREE SOLDER PASTE
Features
- Lead-Free Silver-Added Bismuth-Tin Alloy
- Low Melting Point 138°C (280°F) Solidus
- No-Clean Halide-Free Flux (IPC J-STD-004 ROL0)
- Type 4 Powder (20–38 μm) per IPC J-STD-005
- 15 g Resealable Luer-Lock Syringe
Description
Sn42/Bi57.6/Ag0.4 is composed of 42.0% tin, 57.6% bismuth and 0.4% silver, formulated as a no-clean Type 4 solder paste for low-temperature reflow assembly. The small silver addition is made to the standard Sn42/Bi58 system; the reflow profile is unchanged. Typical applications include second-stage reflow for circuit board assembly, attachment of heat-sensitive components, flexible PCBs (FPC), LED arrays, and hand dispensing or rework where peak temperatures must remain below 170°C. Sn42/Bi57.6/Ag0.4 begins to melt at 138°C (280°F).
Impurity Levels to IPC-J-STD-006 in Percent
| Pb: 0.10 | Cu: 0.08 | In: 0.10 | Sb: 0.05 |
| Al: 0.005 | Au: 0.05 | Ni: 0.01 | Fe: 0.02 |
| As: 0.03 | Cd: 0.08 | Zn: 0.003 |
Major Alloy Ingredients in Percent
| Sn | Bi | Ag |
|---|---|---|
| Sn: 42.0 (bal.) | Bi: 57.6 ± 0.5 | Ag: 0.4 ± 0.1 |
Properties
| Properties | Results |
|---|---|
| Solidus Temperature °C | 138 |
Handling & Storage
Store refrigerated at 2–10°C (36–50°F). Do not freeze. Shelf life is 6 months from date of manufacture when stored unopened in original container. Allow 1–2 hours at room temperature (20–25°C) for the syringe to reach operating temperature before use. After opening, store upright in refrigerator; best used within 2 weeks. Consult the Safety Data Sheet for specific handling procedures.
Flux
tinvoa Sn42/Bi57.6/Ag0.4 solder paste contains an integrated synthetic no-clean flux classified as ROL0 per IPC J-STD-004 (Rosin base, Low activity, Halide-free). Halide content is below detectable limits. Metal content is approximately 88.5% by weight.
Cleaning
No cleaning required. The no-clean flux residue is non-conductive and non-corrosive and may remain on the assembly. If cleaning is desired for aesthetic or coating reasons, use an IPA-based solvent.
Safety
Use with adequate ventilation and proper personal protective equipment. Classified as H410 — Very toxic to aquatic life with long lasting effects (GHS09), and H317 — May cause an allergic skin reaction (flux, GHS07). Not regulated under DOT, ICAO-IATA, or IMDG. California Proposition 65 Warning: Cancer and Reproductive Harm — www.P65Warnings.ca.gov. Refer to the product Safety Data Sheet (available on request from [email protected]) for emergency information. Do not dispose of any hazardous materials in non-approved containers.