Zinc Alloy Zn99.5
ASTM B69 · EN 988 Zn99.5
Zn99.5 is commercially pure wrought zinc (EN 988 Zn99.5, B69) with minimal alloying, rolled into sheet, strip and foil and supplied in rolled, annealed, hard, hot-rolled and extruded conditions.
Reference datasheet — Zn99.5 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 R condition
Zn99.5 tempers and conditions
Zn99.5 is supplied in 4 conditions, soft to hard. R 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 |
|---|---|---|---|---|---|---|
Annealed | Choose for deep drawing, complex press work and hand-formed ornamental work where maximum ductility is needed. | 65 | 120 | 55 | 30 HB | 28 % IACS |
Hot rolled | Thicker plate (>3 mm) for anodes, moulds, engraving/printing blocks and machined blanks. | 80 | 130 | 45 | 35 HB | 28 % IACS |
RDefault As-rolled sheet/strip | Standard stocked rolled zinc sheet/coil for roofing, flashing and cladding; best balance of strength and roll-formability. | 95 | 140 | 40 | 38 HB | 28 % IACS |
Hardened | Higher-strength thin strip for battery cans, stamped parts and spacers; note that zinc partially self-anneals at room temperature. | 140 | 180 | 25 | 47 HB | 27 % IACS |
Supply forms, finishes and certifications
Ways Zn99.5 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
FOIL | Rolled zinc foil | Supply form |
EX | Extruded rod, bar and wire | Surface finish |
What is Zn99.5?
Zn99.5 is commercially pure wrought zinc (EN 988 Zn99.5, B69) with minimal alloying, rolled into sheet, strip and foil and supplied in rolled, annealed, hard, hot-rolled and extruded conditions. Engineers specify it for atmospheric corrosion resistance and forming behaviour: about 140 MPa tensile, 95 MPa yield, 40 % elongation, 38 HB, and a formability score of 88 that suits standing-seam roofing, gutters and drawn can stock. Limits are a maximum service temperature near 100 °C, creep under sustained load, and cracking if cold sheet is bent tightly. Where higher strength or stiffness is needed, a rolled zinc-copper-titanium alloy is the nearest alternative. Zn99.5 has a density of 7.14 g/cm³ (0.258 lb/in³), heavier than 82% of zinc alloy grades. It melts at 420°C (787 °F). Zn99.5 has a yield strength of 95 MPa (13.8 ksi) and a tensile strength of 140 MPa (20.3 ksi) — weaker than 71% of zinc alloy grades. Elongation at break is 40% and the elastic modulus is 95 GPa (13.8 Msi).
What is Zn99.5 used for?
- roofing and flashing
- gutters and downspouts
- battery can stock
- gaskets and washers
Advantages
- Forms and bends easily — 88/100, better than 100% of zinc alloy grades
- Good corrosion resistance — 55/100, better than 93% of zinc alloy grades
- Readily welded — 40/100, better than 93% of zinc alloy grades
- Ductile — tolerates forming and impact — 40%, better than 89% of zinc alloy grades
Zn99.5 properties
Typical room-temperature values for Zn99.5-R; bars are the position among zinc alloy grades.
Physical3
Zn99.5 has a density of 7.14 g/cm³ (0.258 lb/in³), heavier than 82% of zinc alloy grades. It melts at 420°C (787 °F).
Mechanical12
Zn99.5 has a yield strength of 95 MPa (13.8 ksi) and a tensile strength of 140 MPa (20.3 ksi) — weaker than 71% of zinc alloy grades. Elongation at break is 40% and the elastic modulus is 95 GPa (13.8 Msi).
Thermal6
Zn99.5 is rated for continuous service to 100°C (212 °F). It conducts heat at 113 W/m·K (65.3 BTU/hr·ft·°F), better than 57% of zinc alloy grades. Thermal expansion is 30 µm/m·K (16.7 µin/in·°F).
Electrical3
Zn99.5 conducts electricity at 28 % IACS, better than 75% of zinc alloy grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), better than 93% of zinc alloy grades.
Sustainability4
Producing a kilogram of Zn99.5 takes about 53 MJ of energy and emits 3.6 kg of CO₂ — less than 68% of zinc alloy grades. Typical recycled content is 30%.
Manufacturability8
Zn99.5's machinability is very good (75/100, worse than 79% of zinc alloy grades); weldability fair (40/100); formability excellent (88/100).
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 zinc alloy family
Yield strength against density for every zinc alloy grade FabDigit runs. Zn99.5 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Zn99.5
Is Zn99.5 easy to machine?
Cuts very easily with sharp positive-rake tools and high speeds, but is gummy — use generous rake, light feeds and a lubricant to avoid built-up edge and smearing.
Can Zn99.5 be welded?
TIG/plasma or oxy-gas welding with zinc filler is possible on thick sheet but demands close heat control (melting point 419 °C); soft soldering with zinc-chloride flux is the normal joining route, along with mechanical seaming.
Can Zn99.5 be formed, bent or molded?
Excellent roll-forming, bending and standing-seam work; warm the sheet to 10–20 °C minimum (ideally 20–40 °C for tight radii) since cold zinc cracks, and bend across the rolling direction where possible.
Zn99.5 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 |
|---|---|---|
| Pbresidual from primary refining; improves rollability | ≤ 0.45 | 0.15 |
| Fe | ≤ 0.05 | 0.02 |
| Cd | ≤ 0.01 | 0.01 |
| Cu | ≤ 0 | 0 |
| Sn | ≤ 0 | 0 |
| Al | ≤ 0.01 | 0 |
| Total impuritiessum of all non-zinc elements | ≤ 0.5 | |
| Znminimum zinc content per EN 1179 / GB/T 470 Zn99.5 | ≥ 99.5 (balance) |
What surface finishes work on Zn99.5?
Not anodizable — supplied mill-bright or pre-weathered/pre-patinated; chromate or phosphate conversion plus etch primer is required before painting, and contact with copper or acidic run-off must be avoided.
Surface treatments FabDigit runs on zinc alloy 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).
Plating
Equivalent designations
Standards and trade names that resolve to Zinc Alloy Zn99.5 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B69
- EN / DIN / Werkstoff-Nr.
- 988 Zn99.5
How much does Zn99.5 cost?
Zn99.5 is a premium-cost zinc alloy ($$$), cheaper than about 51% 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.
Zn99.5 — frequently asked
What is Zn99.5 used for?
Zn99.5 is typically used for roofing and flashing, gutters and downspouts, battery can stock and gaskets and washers. In short: most formable rolled zinc; self-patinating roof sheet; commercially pure zinc grade.
What is the yield strength of Zn99.5?
Zn99.5 has a typical yield strength of 95 MPa (13.8 ksi) and a tensile strength of 140 MPa (20.3 ksi) — weaker than 71% of zinc alloy grades. Strength varies by condition: see the 4 listed tempers.
Is Zn99.5 easy to machine?
Yes — machinability is rated very good (75/100, worse than 79% of zinc alloy grades). Cuts very easily with sharp positive-rake tools and high speeds, but is gummy — use generous rake, light feeds and a lubricant to avoid built-up edge and smearing.
Can Zn99.5 be welded?
With care — weldability is rated fair (40/100). TIG/plasma or oxy-gas welding with zinc filler is possible on thick sheet but demands close heat control (melting point 419 °C); soft soldering with zinc-chloride flux is the normal joining route, along with mechanical seaming.
What surface finishes work on Zn99.5?
Not anodizable — supplied mill-bright or pre-weathered/pre-patinated; chromate or phosphate conversion plus etch primer is required before painting, and contact with copper or acidic run-off must be avoided.
Can Zn99.5 be formed, bent or molded?
Excellent roll-forming, bending and standing-seam work; warm the sheet to 10–20 °C minimum (ideally 20–40 °C for tight radii) since cold zinc cracks, and bend across the rolling direction where possible.
What is the maximum service temperature of Zn99.5?
Zn99.5 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.
What is the difference between Zn99.5-R and Zn99.5-H?
R is the default condition — standard stocked rolled zinc sheet/coil for roofing, flashing and cladding; best balance of strength and roll-formability. H: higher-strength thin strip for battery cans, stamped parts and spacers; note that zinc partially self-anneals at room temperature. Yield strength is 95 MPa in R versus 140 MPa in H.
How much does Zn99.5 cost?
Zn99.5 is a premium-cost zinc alloy ($$$), cheaper than about 51% 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
- EN 988 — Zinc and zinc alloys: specification for rolled flat products for building — CEN (1997)
- EN 1179 — Zinc and zinc alloys: primary zinc — CEN (2003)
- GB/T 470 — SAC (2008)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys (Zinc and Zinc Alloys) — ASM International (1990)
- ASM Metals Reference Book, 3rd ed. — ASM International (1993)
- International Zinc Association / ILZRO rolled zinc property data — IZA (2020)
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.