Aluminum ER1188
ASTM AWS A5.10 ER1188 · EN S Al 1450
ER1188 is an ultra-high-purity 1000-series aluminum welding filler to AWS A5.10 (also designated S Al 1450), supplied as wire and rod in AW, O, F and H14 conditions.
Reference datasheet — ER1188 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.
Values for the AW condition
ER1188 tempers and conditions
ER1188 is supplied in 4 conditions, soft to hard. AW is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AWDefault As-welded deposit | Use for design/QA of the deposited weld metal made with ER1188 on high-purity 1000-series base metal. | 20 | 50 | 45 | 18 HB | 64 % IACS |
Annealed | Soft annealed cut-length rod (1.6–4.0 mm) for GTAW where feeding stiffness is not needed and cleanest metal is wanted. | 22 | 60 | 45 | 18 HB | 64.5 % IACS |
As fabricated | Supply condition for coiled bulk or drum-pack filler where mechanical properties are not specified. | 50 | 85 | 20 | 24 HB | 64 % IACS |
Strain hardened, half hard | Standard temper for 0.8–1.6 mm GMAW spool wire, drawn stiff enough to feed without birdnesting. | 95 | 110 | 6 | 30 HB | 63.5 % IACS |
What is ER1188?
ER1188 is an ultra-high-purity 1000-series aluminum welding filler to AWS A5.10 (also designated S Al 1450), supplied as wire and rod in AW, O, F and H14 conditions. It is used to weld high-purity 1000-series base metals in semiconductor, chemical and reflective applications where filler impurity content must be held to a minimum, and it retains high conductivity at 234 W/m·K and 64% IACS. Strength is very low — 50 MPa tensile, 20 MPa yield, 18 HB with 45% elongation — and service is limited to about 150 °C, so joints should not be load-bearing. Where purity is less critical and higher joint strength is wanted, ER1100 is the usual substitute. ER1188 has a density of 2.7 g/cm³ (0.0975 lb/in³), lighter than 59% of aluminum grades. It melts at 657°C (1,215 °F). ER1188 has a yield strength of 20 MPa (2.9 ksi) and a tensile strength of 50 MPa (7.25 ksi) — weaker than 100% of aluminum grades. Elongation at break is 45% and the elastic modulus is 68 GPa (9.86 Msi).
What is ER1188 used for?
- semiconductor process equipment
- high-purity chemical piping
- reflector fabrication
Advantages
- Ductile — tolerates forming and impact — 45%, better than 100% of aluminum grades
- High electrical conductivity — 64 % IACS, better than 100% of aluminum grades
- Readily welded — 96/100, better than 100% of aluminum grades
- Conducts heat well — 234 W/m·K (135.2 BTU/hr·ft·°F), better than 99% of aluminum grades
- Polishes to a fine finish — 92/100, better than 99% of aluminum grades
Limitations
- Low strength — 20 MPa (2.9 ksi), worse than 100% of aluminum grades
- High embodied carbon — 16 kg CO₂/kg, worse than 98% of aluminum grades
- Difficult to machine — 25/100, worse than 96% of aluminum grades
ER1188 properties
Typical room-temperature values for ER1188-AW; bars are the position among aluminum grades.
Physical3
ER1188 has a density of 2.7 g/cm³ (0.0975 lb/in³), lighter than 59% of aluminum grades. It melts at 657°C (1,215 °F).
Mechanical10
ER1188 has a yield strength of 20 MPa (2.9 ksi) and a tensile strength of 50 MPa (7.25 ksi) — weaker than 100% of aluminum grades. Elongation at break is 45% and the elastic modulus is 68 GPa (9.86 Msi).
Thermal6
ER1188 is rated for continuous service to 150°C (302 °F). It conducts heat at 234 W/m·K (135.2 BTU/hr·ft·°F), better than 99% of aluminum grades. Thermal expansion is 23.6 µm/m·K (13.1 µin/in·°F).
Electrical3
ER1188 conducts electricity at 64 % IACS, better than 100% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is very good (78/100), better than 94% of aluminum grades.
Sustainability4
Producing a kilogram of ER1188 takes about 240 MJ of energy and emits 16 kg of CO₂ — more than 98% of aluminum grades. Typical recycled content is 0%.
Manufacturability8
ER1188's machinability is poor (25/100, worse than 96% of aluminum grades); weldability excellent (96/100); 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 aluminum family
Yield strength against density for every aluminum grade FabDigit runs. ER1188 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with ER1188
Is ER1188 easy to machine?
Rarely machined; if required use sharp polished high-rake carbide, high speed, low feed and flood lubricant to avoid smearing and built-up edge.
Can ER1188 be welded?
Designed as filler for GTAW/GMAW of 1050A/1060/1070/1080/1199 — use AC or He-rich shielding, keep the wire oxide-free and gloved, and expect very low joint strength so joints must not be load-bearing.
Can ER1188 be formed, bent or molded?
Extremely ductile in O temper; drawn H1x wire work-hardens fast, so re-anneal before tight coiling or re-drawing.
ER1188 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 %) |
|---|---|
| Si | ≤ 0.06 |
| Fe | ≤ 0.06 |
| Cu | ≤ 0.01 |
| Mn | ≤ 0.01 |
| Mg | ≤ 0.01 |
| Zn | ≤ 0.03 |
| Ti | ≤ 0.01 |
| VV + Ti combined limit also applies in AA registration | ≤ 0.05 |
| Ga | ≤ 0.03 |
| Berestricted for fume safety in AWS A5.10 | ≤ 3×10⁻⁴ |
| Others (each)total others 0.03 max | ≤ 0.01 |
| Al99.88 % min aluminium | ≥ 99.88 (balance) |
What surface finishes work on ER1188?
Takes bright chemical/electropolish and clear anodize with excellent clarity and colour match to high-purity base metal; avoid alkaline etch overexposure which pits the soft surface.
Surface treatments FabDigit runs on aluminum parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Organic Coating
Equivalent designations
Standards and trade names that resolve to Aluminum ER1188 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- AWS A5.10 ER1188
- EN / DIN / Werkstoff-Nr.
- S Al 1450
- Other
- 1188
How much does ER1188 cost?
ER1188 is a high-cost aluminum ($$$$), 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.
ER1188 — frequently asked
What is ER1188 used for?
ER1188 is typically used for semiconductor process equipment, high-purity chemical piping and reflector fabrication. In short: highest-purity aluminum filler; highest conductivity filler wire; very low joint strength.
What is the yield strength of ER1188?
ER1188 has a typical yield strength of 20 MPa (2.9 ksi) and a tensile strength of 50 MPa (7.25 ksi) — weaker than 100% of aluminum grades. Strength varies by condition: see the 4 listed tempers.
Is ER1188 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 96% of aluminum grades). Rarely machined; if required use sharp polished high-rake carbide, high speed, low feed and flood lubricant to avoid smearing and built-up edge.
Can ER1188 be welded?
Yes — weldability is rated excellent (96/100). Designed as filler for GTAW/GMAW of 1050A/1060/1070/1080/1199 — use AC or He-rich shielding, keep the wire oxide-free and gloved, and expect very low joint strength so joints must not be load-bearing.
What surface finishes work on ER1188?
Takes bright chemical/electropolish and clear anodize with excellent clarity and colour match to high-purity base metal; avoid alkaline etch overexposure which pits the soft surface.
Can ER1188 be formed, bent or molded?
Extremely ductile in O temper; drawn H1x wire work-hardens fast, so re-anneal before tight coiling or re-drawing.
What is the maximum service temperature of ER1188?
ER1188 is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ER1188-AW and ER1188-H14?
AW is the default condition — use for design/QA of the deposited weld metal made with ER1188 on high-purity 1000-series base metal. H14: standard temper for 0.8–1.6 mm GMAW spool wire, drawn stiff enough to feed without birdnesting. Yield strength is 20 MPa in AW versus 95 MPa in H14.
How much does ER1188 cost?
ER1188 is a high-cost aluminum ($$$$), 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
- AWS A5.10/A5.10M — Welding Consumables — Wire Electrodes, Wires and Rods for Welding of Aluminium — AWS (2021)
- EN ISO 18273 — Wire electrodes, wires and rods for welding of aluminium and aluminium alloys (S Al 1450) — ISO (2015)
- International Alloy Designations and Chemical Composition Limits for Wrought Aluminum (Teal Sheets) — The Aluminum Association (2018)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering — ASM International (1993)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
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.