Solder & Low-Melting Alloy In100
In100 is commercially pure indium, melting at 156.6 °C, offered in 4N to 6N purity ingot plus foil, wire, preform, shot and sputtering target forms.
Reference datasheet — In100 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.
In100 tempers and conditions
In100 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 |
|---|---|---|---|---|---|---|
ultra-high-purity | Only where trace metals must be <1 ppm: epitaxial III-V precursors, research crystals. | 0.65 | 2 | 55 | 21.2 % IACS | |
high-purity ingot / shot | Semiconductor-grade purity for compound-semiconductor (InP/InSb) and sputtering-target feedstock. | 0.7 | 2 | 50 | 21 % IACS | |
refined ingot | Pick when Pb/Cd/Tl impurities must be lower, e.g. ITO feedstock and electronics solders. | 0.75 | 2 | 45 | 1 HV | 20.8 % IACS |
Supply forms, finishes and certifications
Ways In100 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
4N-INGOTDefault | 4N | Supply form |
FOIL | Rolled foil / sheet | Supply form |
PREFORM | Stamped preforms / washers / discs | Supply form |
SHOT | Shot / pellet / granule | Supply form |
TARGET | Cast / bonded sputtering target | Supply form |
WIRE | Drawn / extruded wire and ribbon | Supply form |
What is In100?
In100 is commercially pure indium, melting at 156.6 °C, offered in 4N to 6N purity ingot plus foil, wire, preform, shot and sputtering target forms. It is used as a soft, fully ductile solder, gasket and thermal interface material for cryogenic seals, vacuum systems and semiconductor die attach where stress-free bonding is required; properties are 2.6 MPa tensile strength, 0.8 MPa yield, 40% elongation, 1 HB, 81.8 W/m·K thermal conductivity and 20.6% IACS. It carries almost no load, cold-flows at room temperature and limits service to about 80 °C; In97Ag3 adds a little strength at similar melt temperature. In100 has a density of 7.31 g/cm³ (0.264 lb/in³), lighter than 90% of solder & low-melting alloy grades. It melts at 157°C (314 °F). In100 has a yield strength of 0.8 MPa (0.116 ksi) and a tensile strength of 3 MPa (0.377 ksi) — weaker than 100% of solder & low-melting alloy grades. Elongation at break is 40% and the elastic modulus is 11 GPa (1.6 Msi).
What is In100 used for?
- cryogenic vacuum seals
- semiconductor die bonding
- optical window sealing
- thermal interface material
Advantages
- Conducts heat well — 81.8 W/m·K (47.3 BTU/hr·ft·°F), better than 100% of solder & low-melting alloy grades
- High electrical conductivity — 20.6 % IACS, better than 100% of solder & low-melting alloy grades
- Readily welded — 80/100, better than 100% of solder & low-melting alloy grades
- Lightweight — 7.31 g/cm³ (0.264 lb/in³), better than 90% of solder & low-melting alloy grades
Limitations
- Low strength — 0.8 MPa (0.116 ksi), worse than 100% of solder & low-melting alloy grades
- Hard to polish — 10/100, worse than 100% of solder & low-melting alloy grades
- Difficult to machine — 15/100, worse than 99% of solder & low-melting alloy grades
- High embodied carbon — 102 kg CO₂/kg, worse than 97% of solder & low-melting alloy grades
- Low stiffness — 11 GPa (1.6 Msi), worse than 96% of solder & low-melting alloy grades
In100 properties
Typical room-temperature values; bars are the position among solder & low-melting alloy grades.
Physical3
In100 has a density of 7.31 g/cm³ (0.264 lb/in³), lighter than 90% of solder & low-melting alloy grades. It melts at 157°C (314 °F).
Mechanical9
In100 has a yield strength of 0.8 MPa (0.116 ksi) and a tensile strength of 3 MPa (0.377 ksi) — weaker than 100% of solder & low-melting alloy grades. Elongation at break is 40% and the elastic modulus is 11 GPa (1.6 Msi).
Thermal6
In100 is rated for continuous service to 80°C (176 °F). It conducts heat at 81.8 W/m·K (47.3 BTU/hr·ft·°F), better than 100% of solder & low-melting alloy grades. Thermal expansion is 32.1 µm/m·K (17.8 µin/in·°F).
Electrical3
In100 conducts electricity at 20.6 % IACS, better than 100% of solder & low-melting alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 52% of solder & low-melting alloy grades.
Sustainability4
Producing a kilogram of In100 takes about 1,720 MJ of energy and emits 102 kg of CO₂ — more than 98% of solder & low-melting alloy grades. Typical recycled content is 30%.
Manufacturability7
In100's machinability is poor (15/100, worse than 99% of solder & low-melting alloy grades); weldability very good (80/100); formability excellent (98/100).
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. In100 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with In100
Is In100 easy to machine?
Effectively unmachinable by conventional cutting — it smears and loads tools; shear, die-cut or stamp foil, or turn chilled (dry ice/LN₂) with razor-sharp tooling.
Can In100 be welded?
Not fusion welded; joins by cold pressure welding, ultrasonic bonding or simple remelting above 157 °C — indium itself is the filler.
Can In100 be formed, bent or molded?
Rolls, extrudes and coins cold to almost any reduction without intermediate anneals since it recrystallizes at room temperature; keep handling clean and glove-only to avoid embedding particles.
In100 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 |
|---|---|---|
| Pb | ≤ 0 | 5×10⁻⁴ |
| Sn | ≤ 0 | 3×10⁻⁴ |
| Cd | ≤ 0 | 2×10⁻⁴ |
| Zn | ≤ 0 | 2×10⁻⁴ |
| Cu | ≤ 0 | 2×10⁻⁴ |
| Fe | ≤ 0 | 5×10⁻⁴ |
| Tl | ≤ 0 | 2×10⁻⁴ |
| Al | ≤ 0 | 2×10⁻⁴ |
| As | ≤ 5×10⁻⁴ | 1×10⁻⁴ |
| In4N grade per GB/T 1473 / ASTM B584-class refined indium | ≥ 99.99 (balance) |
What surface finishes work on In100?
No plating or anodizing practice; degrease and lightly abrade or acid-dip (dilute HCl) immediately before soldering to remove the oxide, and store sealed to limit tarnish and cold-flow deformation.
Equivalent designations
Standards and trade names that resolve to Solder & Low-Melting Alloy In100 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Also called
- Indium 99.99%
How much does In100 cost?
In100 is a high-cost solder & low-melting alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
In100 — frequently asked
What is In100 used for?
In100 is typically used for cryogenic vacuum seals, semiconductor die bonding, optical window sealing and thermal interface material. In short: softest metal in family; reusable cryogenic seal material; highest thermal conductivity here.
What is the yield strength of In100?
In100 has a typical yield strength of 0.8 MPa (0.116 ksi) and a tensile strength of 3 MPa (0.377 ksi) — weaker than 100% of solder & low-melting alloy grades. Strength varies by condition: see the 3 listed tempers.
Is In100 easy to machine?
Not especially — machinability is rated poor (15/100, worse than 99% of solder & low-melting alloy grades). Effectively unmachinable by conventional cutting — it smears and loads tools; shear, die-cut or stamp foil, or turn chilled (dry ice/LN₂) with razor-sharp tooling.
Can In100 be welded?
Yes — weldability is rated very good (80/100). Not fusion welded; joins by cold pressure welding, ultrasonic bonding or simple remelting above 157 °C — indium itself is the filler.
What surface finishes work on In100?
No plating or anodizing practice; degrease and lightly abrade or acid-dip (dilute HCl) immediately before soldering to remove the oxide, and store sealed to limit tarnish and cold-flow deformation.
Can In100 be formed, bent or molded?
Rolls, extrudes and coins cold to almost any reduction without intermediate anneals since it recrystallizes at room temperature; keep handling clean and glove-only to avoid embedding particles.
What is the maximum service temperature of In100?
In100 is rated for continuous use to about 80°C (176 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does In100 cost?
In100 is a high-cost solder & low-melting alloy ($$$$), 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
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (indium and indium alloys) — ASM International (1990)
- CRC Handbook of Chemistry and Physics, 97th ed. — physical properties of the elements — CRC Press (2016)
- GB/T 1473 (Indium ingot) — SAC / (2021)
- Indium metal, foil, wire and preform technical data — Indium Corporation (2023)
- Life-cycle inventory / cumulative energy demand of 63 metals — Nuss & Eckelman, PLoS ONE (2014)
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.