Solder & Low-Melting Alloy Sn99.9
ASTM B339 Grade A · JIS H2112 Sn99.9
Sn99.9 is commercially pure tin at about 99.9% Sn, supplied to ASTM B339 Grade A as ingot, castings, cold-rolled and annealed sheet, extrusion and shot.
Reference datasheet — Sn99.9 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.
Sn99.9 tempers and conditions
Sn99.9 is supplied in 3 conditions, soft to hard.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As cast | Pick for cast tin anodes, tinning bar and decorative castings where no mechanical duty is required. | 8 | 14 | 40 | 4 HB | 15 % IACS |
Annealed | Fully soft condition (which pure tin reverts to at room temperature anyway) for maximum ductility in forming and wrapping. | 8 | 15 | 60 | 4 HB | 15 % IACS |
Cold rolled | Rolled sheet, strip and foil for gaskets, capacitor foil, organ pipes and lining; tin self-anneals at room temperature so 'hard' tempers are not stable. | 11 | 20 | 55 | 5 HB | 15 % IACS |
Supply forms, finishes and certifications
Ways Sn99.9 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
EXT | Extruded rod, bar, wire and tube | Supply form |
IngotDefault | As-cast pure tin | Supply form |
SHOT | Shot / granule / atomized powder | Supply form |
What is Sn99.9?
Sn99.9 is commercially pure tin at about 99.9% Sn, supplied to ASTM B339 Grade A as ingot, castings, cold-rolled and annealed sheet, extrusion and shot. It is the base feedstock for babbitt, pewter, solder and tinplate coatings, and is used directly as plating anode stock and as raw material for tin chemicals, chosen for corrosion resistance and low melting point. Mechanically it is very weak — 14 MPa tensile, 8 MPa yield, 45% elongation, 3.9 HB — and it recrystallizes at room temperature, so it creeps and carries no structural load. Where a tin-based part needs strength, use a pewter such as ASTM B560 Type I or Type III. Sn99.9 has a density of 7.29 g/cm³ (0.263 lb/in³), lighter than 96% of solder & low-melting alloy grades. It melts at 232°C (449 °F). Sn99.9 has a yield strength of 9 MPa (1.31 ksi) and a tensile strength of 15 MPa (2.18 ksi) — weaker than 91% of solder & low-melting alloy grades. Elongation at break is 50% and the elastic modulus is 44 GPa (6.38 Msi).
What is Sn99.9 used for?
- alloy feedstock
- tin plating anodes
- chemical tin salts
- babbitt/pewter melting stock
Advantages
- Conducts heat well — 66.6 W/m·K (38.5 BTU/hr·ft·°F), better than 98% of solder & low-melting alloy grades
- High electrical conductivity — 15 % IACS, better than 97% of solder & low-melting alloy grades
- Lightweight — 7.29 g/cm³ (0.263 lb/in³), better than 96% of solder & low-melting alloy grades
- Good corrosion resistance — 65/100, better than 96% of solder & low-melting alloy grades
- Ductile — tolerates forming and impact — 50%, better than 92% of solder & low-melting alloy grades
Limitations
- Low strength — 9 MPa (1.31 ksi), worse than 91% of solder & low-melting alloy grades
- High embodied carbon — 18 kg CO₂/kg, worse than 76% of solder & low-melting alloy grades
Sn99.9 properties
Typical room-temperature values; bars are the position among solder & low-melting alloy grades.
Physical3
Sn99.9 has a density of 7.29 g/cm³ (0.263 lb/in³), lighter than 96% of solder & low-melting alloy grades. It melts at 232°C (449 °F).
Mechanical10
Sn99.9 has a yield strength of 9 MPa (1.31 ksi) and a tensile strength of 15 MPa (2.18 ksi) — weaker than 91% of solder & low-melting alloy grades. Elongation at break is 50% and the elastic modulus is 44 GPa (6.38 Msi).
Thermal6
Sn99.9 is rated for continuous service to 100°C (212 °F). It conducts heat at 66.6 W/m·K (38.5 BTU/hr·ft·°F), better than 98% of solder & low-melting alloy grades. Thermal expansion is 23 µm/m·K (12.8 µin/in·°F).
Electrical3
Sn99.9 conducts electricity at 15 % IACS, better than 97% of solder & low-melting alloy grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 96% of solder & low-melting alloy grades.
Sustainability4
Producing a kilogram of Sn99.9 takes about 320 MJ of energy and emits 18 kg of CO₂ — more than 81% of solder & low-melting alloy grades. Typical recycled content is 30%.
Manufacturability8
Sn99.9's machinability is fair (45/100, better than 69% of solder & low-melting alloy grades); weldability fair (40/100); formability excellent (95/100).
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. Sn99.9 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Sn99.9
Is Sn99.9 easy to machine?
Very soft and gummy — use sharp high-rake tools, high speed, light feed and generous lubrication or freeze/chill the part to avoid smearing.
Can Sn99.9 be welded?
Rarely fusion welded; joints are made by soldering or by simply remelting since the metal itself is the solder base — keep away from sulfur and avoid overheating (dross formation).
Can Sn99.9 be formed, bent or molded?
Rolls to foil and cold-forms almost without limit because it recrystallizes at room temperature; casts easily at 250–300 °C with low shrinkage but poor as-cast strength.
Sn99.9 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.
| Element | Spec limit (wt %) |
|---|---|
| Pbimpurity limit | ≤ 0.05 |
| Sbimpurity limit | ≤ 0.05 |
| Biimpurity limit | ≤ 0.03 |
| Asimpurity limit | ≤ 0.03 |
| Cuimpurity limit | ≤ 0.03 |
| Feimpurity limit | ≤ 0.01 |
| Znimpurity limit | ≤ 0 |
| Alimpurity limit | ≤ 0 |
| Cdimpurity limit | ≤ 0 |
| Simpurity limit | ≤ 0.01 |
| Total impuritiessum of impurities | ≤ 0.1 |
| SnGB/T 728 Sn99.90 / ASTM B339 Grade A | ≥ 99.9 (balance) |
What surface finishes work on Sn99.9?
Bright but easily scratched; can be burnished, tumbled or lightly buffed. Not anodizable; typically used as-plated/tinned or given a light passivation to avoid dulling and whisker growth.
Equivalent designations
Standards and trade names that resolve to Solder & Low-Melting Alloy Sn99.9 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B339 Grade A
- JIS
- H2112 Sn99.9
How much does Sn99.9 cost?
Sn99.9 is a high-cost solder & low-melting alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sn99.9 — frequently asked
What is Sn99.9 used for?
Sn99.9 is typically used for alloy feedstock, tin plating anodes, chemical tin salts and babbitt/pewter melting stock. In short: purest tin feedstock; corrosion-resistant, low melting point; softest alloy in the family.
What is the yield strength of Sn99.9?
Sn99.9 has a typical yield strength of 9 MPa (1.31 ksi) and a tensile strength of 15 MPa (2.18 ksi) — weaker than 91% of solder & low-melting alloy grades. Strength varies by condition: see the 3 listed tempers.
Is Sn99.9 easy to machine?
Reasonably — machinability is rated fair (45/100, better than 69% of solder & low-melting alloy grades). Very soft and gummy — use sharp high-rake tools, high speed, light feed and generous lubrication or freeze/chill the part to avoid smearing.
Can Sn99.9 be welded?
With care — weldability is rated fair (40/100). Rarely fusion welded; joints are made by soldering or by simply remelting since the metal itself is the solder base — keep away from sulfur and avoid overheating (dross formation).
What surface finishes work on Sn99.9?
Bright but easily scratched; can be burnished, tumbled or lightly buffed. Not anodizable; typically used as-plated/tinned or given a light passivation to avoid dulling and whisker growth.
Can Sn99.9 be formed, bent or molded?
Rolls to foil and cold-forms almost without limit because it recrystallizes at room temperature; casts easily at 250–300 °C with low shrinkage but poor as-cast strength.
What is the maximum service temperature of Sn99.9?
Sn99.9 is rated for continuous use to about 100°C (212 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does Sn99.9 cost?
Sn99.9 is a high-cost solder & low-melting alloy ($$$$), 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
- GB/T 728 — SAC (2020)
- ASTM B339 Standard Specification for Pig Tin — ASTM International (2022)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys (Tin and Tin Alloys) — ASM International (1990)
- CRC Handbook of Chemistry and Physics — Properties of the Elements — CRC Press (2022)
- International Tin Association / ITRI tin property data — ITA (2021)
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.