Solder & Low-Melting Alloy Pure Tin (Grade A) EXTR
Finish state
UNS L13002 · ASTM B339 Grade A
EXTR = extruded / drawn
Pick for tin wire feedstock, collapsible tube and organ-pipe/tin plumbing forms.
Values for the EXTR condition
Other Pure Tin (Grade A) tempers and conditions
Pure Tin (Grade A) is listed in 3 conditions; see the grade overview at Pure Tin (Grade A).
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As cast | Pick for cast tin anodes, organ-pipe metal blanks and small decorative castings. | 9 | 14 | 40 | 5 HB | 15 % IACS |
Cold-rolled sheet, strip and foil | Pick for tin foil, capacitor/organ sheet and formed linings; rolling gives finer grain but tin recrystallizes at room temperature so it stays soft. | 11 | 18 | 55 | 6 HB | 15 % IACS |
EXTRThis page Extruded / drawn | Pick for tin wire feedstock, collapsible tube and organ-pipe/tin plumbing forms. | 11 | 17 | 50 | 5 HB | 15 % IACS |
What is Pure Tin (Grade A) EXTR?
Pure Tin (Grade A) EXTR is Pure Tin (Grade A) supplied in the EXTR condition — pick for tin wire feedstock, collapsible tube and organ-pipe/tin plumbing forms. Pure Tin (Grade A) EXTR has a yield strength of 11 MPa (1.6 ksi) and a tensile strength of 17 MPa (2.47 ksi) — weaker than 90% of solder & low-melting alloy grades. Elongation at break is 50% and the elastic modulus is 45 GPa (6.53 Msi). Pure Tin (Grade A) EXTR has a density of 7.3 g/cm³ (0.264 lb/in³), lighter than 93% of solder & low-melting alloy grades. It melts at 232°C (449 °F).
Advantages
- Good corrosion resistance — 70/100, better than 100% of solder & low-melting alloy grades
- Conducts heat well — 66 W/m·K (38.1 BTU/hr·ft·°F), better than 97% of solder & low-melting alloy grades
- High electrical conductivity — 15 % IACS, better than 97% of solder & low-melting alloy grades
- Lightweight — 7.3 g/cm³ (0.264 lb/in³), better than 93% of solder & low-melting alloy grades
- Ductile — tolerates forming and impact — 50%, better than 92% of solder & low-melting alloy grades
Limitations
- Low strength — 11 MPa (1.6 ksi), worse than 90% of solder & low-melting alloy grades
- High embodied carbon — 18 kg CO₂/kg, worse than 76% of solder & low-melting alloy grades
Pure Tin (Grade A) EXTR properties
Typical room-temperature values for Pure Tin (Grade A) EXTR; 17 are specific to this condition. Other listed values are Pure Tin (Grade A) reference data and may not represent this condition. Bars are the position among solder & low-melting alloy grades.
Physical3
Pure Tin (Grade A) EXTR has a density of 7.3 g/cm³ (0.264 lb/in³), lighter than 93% of solder & low-melting alloy grades. It melts at 232°C (449 °F).
Mechanical11
Pure Tin (Grade A) EXTR has a yield strength of 11 MPa (1.6 ksi) and a tensile strength of 17 MPa (2.47 ksi) — weaker than 90% of solder & low-melting alloy grades. Elongation at break is 50% and the elastic modulus is 45 GPa (6.53 Msi).
Thermal6
Pure Tin (Grade A) EXTR is rated for continuous service to 100°C (212 °F). It conducts heat at 66 W/m·K (38.1 BTU/hr·ft·°F), better than 97% of solder & low-melting alloy grades. Thermal expansion is 22 µm/m·K (12.2 µin/in·°F).
Electrical3
Pure Tin (Grade A) EXTR conducts electricity at 15 % IACS, better than 97% of solder & low-melting alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (70/100), better than 100% of solder & low-melting alloy grades.
Sustainability4
Producing a kilogram of Pure Tin (Grade A) EXTR 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%.
Manufacturability7
Pure Tin (Grade A) EXTR's machinability is poor (32/100, better than 53% of solder & low-melting alloy grades); weldability poor (30/100); formability excellent (97/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Pure Tin (Grade A) EXTR
Is Pure Tin (Grade A) easy to machine?
Very soft and gummy — use sharp high-rake HSS tools, high speed, light cuts and flood lubricant (paraffin/kerosene) to stop smearing and built-up edge; expect poor chip control rather than tool wear.
Can Pure Tin (Grade A) be welded?
Not arc-welded in practice; joined by fusion/soldering with tin or tin-lead filler and rosin flux, or by simple remelting since the base metal itself is the solder.
Can Pure Tin (Grade A) be formed, bent or molded?
Rolls, extrudes and spins with almost no limit because tin recrystallizes at room temperature and cannot be work-hardened; but it creeps under sustained load so avoid structural or spring applications.
What surface finishes work on Pure Tin (Grade A)?
Burnishes and buffs to a soft bright lustre that dulls quickly; no anodizing — protect with lacquer or leave the natural oxide, and keep parts above ~13 °C in long-term cold storage to avoid tin pest.
Pure Tin (Grade A) 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 %) |
|---|---|
| Sb | ≤ 0.04 |
| As | ≤ 0.05 |
| Bi | ≤ 0.03 |
| Cu | ≤ 0.04 |
| Fe | ≤ 0.02 |
| Pb | ≤ 0.05 |
| Cd | ≤ 0 |
| Ni+Co | ≤ 0.01 |
| Zn | ≤ 0.01 |
| Al | ≤ 0.01 |
| S | ≤ 0.01 |
| Ag | ≤ 0.01 |
| SnASTM B339 Grade A minimum tin content | ≥ 99.85 (balance) |
Pure Tin (Grade A) EXTR — frequently asked
What is Pure Tin (Grade A) EXTR used for?
Pure Tin (Grade A) EXTR is typically used for master alloy feedstock for babbitt/pewter production, tin plating anodes, solder alloy manufacture and chemical/food-grade tin products. In short: base metal for tin alloys; non-toxic and corrosion resistant; softest common shop metal.
What is the yield strength of Pure Tin (Grade A) EXTR?
Pure Tin (Grade A) EXTR has a typical yield strength of 11 MPa (1.6 ksi) and a tensile strength of 17 MPa (2.47 ksi) — weaker than 90% of solder & low-melting alloy grades. Strength varies by condition: see the 3 listed tempers.
Is Pure Tin (Grade A) EXTR easy to machine?
Not especially — machinability is rated poor (32/100, better than 53% of solder & low-melting alloy grades). Very soft and gummy — use sharp high-rake HSS tools, high speed, light cuts and flood lubricant (paraffin/kerosene) to stop smearing and built-up edge; expect poor chip control rather than tool wear.
Can Pure Tin (Grade A) EXTR be welded?
Not readily — weldability is rated poor (30/100). Not arc-welded in practice; joined by fusion/soldering with tin or tin-lead filler and rosin flux, or by simple remelting since the base metal itself is the solder.
What surface finishes work on Pure Tin (Grade A) EXTR?
Burnishes and buffs to a soft bright lustre that dulls quickly; no anodizing — protect with lacquer or leave the natural oxide, and keep parts above ~13 °C in long-term cold storage to avoid tin pest.
Can Pure Tin (Grade A) EXTR be formed, bent or molded?
Rolls, extrudes and spins with almost no limit because tin recrystallizes at room temperature and cannot be work-hardened; but it creeps under sustained load so avoid structural or spring applications.
What is the maximum service temperature of Pure Tin (Grade A) EXTR?
Pure Tin (Grade A) EXTR 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.
Sources
- ASTM B339 — Standard Specification for Pig Tin — ASTM International (2022)
- GB/T 728 (2020)
- 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 (Sn) — CRC Press (2021)
- Tin and tin alloy technical data — International Tin Association (formerly ITRI) (2020)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.