Solder & Low-Melting Alloy Sn89Zn8Bi3
ISO 811 · also IEC Z80B30
Sn89Zn8Bi3 is a tin-zinc-bismuth lead-free solder, IEC designation Z80B30, in which the bismuth addition drops the melting point to about 197 °C and improves wetting compared with plain Sn-Zn.
Reference datasheet — Sn89Zn8Bi3 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
What is Sn89Zn8Bi3?
Sn89Zn8Bi3 is a tin-zinc-bismuth lead-free solder, IEC designation Z80B30, in which the bismuth addition drops the melting point to about 197 °C and improves wetting compared with plain Sn-Zn. It is used for aluminium and dissimilar-metal joints and is supplied as bar, solid and flux-cored wire, paste, preforms and powder, with 45 MPa yield, 65 MPa tensile, 40% elongation and 22 HB. Service temperature is capped at 100 °C, the alloy needs zinc-compatible active fluxes, and zinc-rich joints tarnish and corrode in humid service. Sn91Zn9 is the closest alternative when bismuth must be avoided. Sn89Zn8Bi3 has a density of 7.35 g/cm³ (0.266 lb/in³), lighter than 84% of solder & low-melting alloy grades. It melts at 189°C (372 °F). Sn89Zn8Bi3 has a yield strength of 45 MPa (6.53 ksi) and a tensile strength of 65 MPa (9.43 ksi) — stronger than 96% of solder & low-melting alloy grades. Elongation at break is 40% and the elastic modulus is 45 GPa (6.53 Msi).
What is Sn89Zn8Bi3 used for?
- Aluminum soldering
- Dissimilar metal joints
- Low-temperature soldering
Advantages
- High strength — 45 MPa (6.53 ksi), better than 96% of solder & low-melting alloy grades
- Conducts heat well — 58 W/m·K (33.5 BTU/hr·ft·°F), better than 85% of solder & low-melting alloy grades
- Lightweight — 7.35 g/cm³ (0.266 lb/in³), better than 84% of solder & low-melting alloy grades
- High electrical conductivity — 12 % IACS, better than 79% of solder & low-melting alloy grades
Limitations
- Needs corrosion protection — 30/100, worse than 99% of solder & low-melting alloy grades
Sn89Zn8Bi3 properties
Typical room-temperature values; bars are the position among solder & low-melting alloy grades.
Physical3
Sn89Zn8Bi3 has a density of 7.35 g/cm³ (0.266 lb/in³), lighter than 84% of solder & low-melting alloy grades. It melts at 189°C (372 °F).
Mechanical9
Sn89Zn8Bi3 has a yield strength of 45 MPa (6.53 ksi) and a tensile strength of 65 MPa (9.43 ksi) — stronger than 96% of solder & low-melting alloy grades. Elongation at break is 40% and the elastic modulus is 45 GPa (6.53 Msi).
Thermal6
Sn89Zn8Bi3 is rated for continuous service to 100°C (212 °F). It conducts heat at 58 W/m·K (33.5 BTU/hr·ft·°F), better than 85% of solder & low-melting alloy grades. Thermal expansion is 25 µm/m·K (13.9 µin/in·°F).
Electrical3
Sn89Zn8Bi3 conducts electricity at 12 % IACS, better than 79% of solder & low-melting alloy grades.
Chemical & Environmental3
Corrosion resistance is poor (30/100), worse than 99% of solder & low-melting alloy grades.
Sustainability4
Producing a kilogram of Sn89Zn8Bi3 takes about 280 MJ of energy and emits 17 kg of CO₂ — more than 65% of solder & low-melting alloy grades. Typical recycled content is 30%.
Manufacturability6
Sn89Zn8Bi3's machinability is fair (35/100, better than 58% of solder & low-melting alloy grades); formability excellent (90/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the solder & low-melting alloy family
Yield strength against density for every solder & low-melting alloy grade FabDigit runs. Sn89Zn8Bi3 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Sn89Zn8Bi3
Is Sn89Zn8Bi3 easy to machine?
Rarely machined; extremely soft and gummy — use sharp high-rake tools, high speed, low feed and paraffin/kerosene lubricant, or simply cast/stamp to shape.
Can Sn89Zn8Bi3 be welded?
Not welded; it is itself a filler — solder at 210–250 °C pot temperature with a zinc-compatible active (halide or reaction-type) flux and keep dwell short to limit dross.
Can Sn89Zn8Bi3 be formed, bent or molded?
Casts into bar readily and extrudes/draws into 0.5–3 mm wire without annealing; keep melt under cover or N₂ to suppress ZnO dross.
Sn89Zn8Bi3 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Znwets/penetrates aluminium oxide; main dross former | 7.5 – 8.5 | 8 |
| Bidepresses melting range and improves spreading | 2.5 – 3.5 | 3 |
| PbRoHS lead-free limit | ≤ 0.07 | |
| Cuimpurity | ≤ 0.05 | |
| Feimpurity | ≤ 0.02 | |
| Alimpurity | ≤ 0.01 | |
| Sbimpurity | ≤ 0.05 | |
| Agimpurity | ≤ 0.05 | |
| Sn | balance |
What surface finishes work on Sn89Zn8Bi3?
No anodizing or plating; clean flux residues immediately and, for humid service, conformal-coat the joint since Zn-rich joints tarnish and corrode.
Equivalent designations
Standards and trade names that resolve to Solder & Low-Melting Alloy Sn89Zn8Bi3 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ISO
- 811
- Trade names
- IEC Z80B30
How much does Sn89Zn8Bi3 cost?
Sn89Zn8Bi3 is a high-cost solder & low-melting alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sn89Zn8Bi3 — frequently asked
What is Sn89Zn8Bi3 used for?
Sn89Zn8Bi3 is typically used for aluminum soldering, dissimilar metal joints and low-temperature soldering. In short: lowest-melting Sn-Zn solder; better wetting than Sn-Zn; aluminium-capable filler.
What is the yield strength of Sn89Zn8Bi3?
Sn89Zn8Bi3 has a typical yield strength of 45 MPa (6.53 ksi) and a tensile strength of 65 MPa (9.43 ksi) — stronger than 96% of solder & low-melting alloy grades.
Is Sn89Zn8Bi3 easy to machine?
Not especially — machinability is rated fair (35/100, better than 58% of solder & low-melting alloy grades). Rarely machined; extremely soft and gummy — use sharp high-rake tools, high speed, low feed and paraffin/kerosene lubricant, or simply cast/stamp to shape.
Can Sn89Zn8Bi3 be welded?
Not welded; it is itself a filler — solder at 210–250 °C pot temperature with a zinc-compatible active (halide or reaction-type) flux and keep dwell short to limit dross.
What surface finishes work on Sn89Zn8Bi3?
No anodizing or plating; clean flux residues immediately and, for humid service, conformal-coat the joint since Zn-rich joints tarnish and corrode.
Can Sn89Zn8Bi3 be formed, bent or molded?
Casts into bar readily and extrudes/draws into 0.5–3 mm wire without annealing; keep melt under cover or N₂ to suppress ZnO dross.
What is the maximum service temperature of Sn89Zn8Bi3?
Sn89Zn8Bi3 is rated for continuous use to about 100°C (212 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does Sn89Zn8Bi3 cost?
Sn89Zn8Bi3 is a high-cost solder & low-melting alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- IEC 61190-1-3 Attachment materials for electronic assembly — requirements for electronic grade solder alloys — IEC (2007)
- J-STD-006 Requirements for Electronic Grade Solder Alloys — IPC (2013)
- GB/T 20422 — SAC (2018)
- ASM Handbook Vol. 6 — Soldering (solder alloy property tables) — ASM International (1993)
- NIST Lead-Free Solder Properties Database — NIST (2002)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.