Gallium Metal Forms: Ingots, Liquid, Alloys, Shots, and Compound Precursors

Gallium Commercial Forms at a Glance

What Physical Forms Does Gallium Metal Come in Commercially?

Gallium metal ships commercially in 5 primary physical forms: ingots (cast blocks), liquid metal (above 29.76°C), shots and pellets (small irregular chunks), powder, and foil or wire in limited availability. Ingots are the dominant commodity form and the basis for standard price quotations. Shots and pellets serve specialized evaporation applications. Liquid gallium is unstable at room temperature in temperate climates and requires thermal management during handling and transit.

Ingots are cast during refining into blocks typically weighing 50g, 100g, 500g, 1 kg, 5 kg, or 10 kg. Commercial ingot dimensions run approximately 2-3 cm × 3-8 cm × 6-12 cm at kilogram scale. Ingots are the least costly form per unit weight and serve most industrial buyers who melt and process gallium into compound semiconductors. At density 5,904 kg/m³, a 1 kg ingot occupies approximately 169 cm³ in volume - slightly larger than a standard ice cube tray cell.

Liquid gallium packages at 4N purity in thick polyethylene vials for retail and research buyers, leveraging gallium's exceptionally low melting point of 29.7646°C (85.5763°F). At typical room temperatures of 20-22°C, liquid gallium shipped from a warm warehouse arrives solidified. Because gallium expands 3.1% upon solidification - the same directional anomaly as water freezing - all packaging accommodates expansion stress. Rigid containers without expansion relief crack or deform when liquid gallium solidifies inside them.

Shots and pellets are small, irregular gallium chunks produced by dripping molten gallium into a cooling medium. They range from 5g to 1 kg per bag and deliver 5N-7N purity grades favored for molecular beam epitaxy (MBE) source material, where controlled evaporation from a small, uniform charge is more practical than loading a cut piece of ingot. The irregular surface area of shots also benefits certain electrodeposition and thin-film processes.

Powder at -325 mesh (particle diameter below approximately 44 micrometers) or 10-50 micron controlled particle size serves CVD/PVD deposition processes, plasma spray applications, and water treatment research. Powder availability is limited compared to ingots; most industrial buyers prefer ingots or shots and melt or evaporate them in-process.

What Is the Standard Trade Form for Gallium in Wholesale Markets?

Ingots and grains (small irregular pieces equivalent to shots) are the standard wholesale trade form. Gallium is priced globally in USD/kg with 4N (99.99% purity) as the benchmark grade. The Western spot price for 4N gallium reached approximately USD 2,100/kg in early 2026. Chinese domestic pricing, assessed by Shanghai Metals Market (SMM), runs at a significant discount to Western pricing - a gap that widened substantially after China's August 2023 export license requirements and December 2024 export ban on gallium to the United States.

Gallium trades almost entirely over-the-counter (OTC) through bilateral contracts between refiners, traders, and industrial end-users. Neither the London Metal Exchange (LME) nor the Shanghai Futures Exchange (SHFE) lists a dedicated gallium futures contract. Price discovery relies on assessments published by Fastmarkets (Rotterdam basis) and Argus Metals, which most long-term supply contracts reference as pricing benchmarks.

Long-term contracts covering 1-3 years dominate the market. Spot transactions exist but represent a small fraction of total volume. Buyers purchasing above 10 kg generally qualify for volume pricing with 2%-5% reductions per tier. See the current gallium price page for live pricing and the gallium price history page for the premium spread between Western and Chinese markets since 2023.

What Purity Grades of Gallium Are Sold and How Do They Differ?

Gallium sells in 5 primary purity grades from 4N to 8N. Each grade designates the number of nines in the purity percentage: 4N = 99.99%, 5N = 99.999%, 6N = 99.9999%, 7N = 99.99999%, and 8N = 99.999999%. Application requirements determine the minimum acceptable grade - most compound semiconductor wafer production requires 6N, while molecular beam epitaxy for quantum research demands 7N or 8N.

4N gallium impurity profile allows zinc, calcium, aluminum, nickel, and indium at 0.5 ppm each, silicon and mercury at 1.0 ppm each, iron and tin at 0.8 ppm each, copper at 1.5 ppm, and lead at 1.8 ppm - totaling no more than 10 ppm combined. At 6N, every listed impurity falls below 0.1 ppm. Semiconductor fabs growing GaAs or GaN wafers specify 6N because even trace iron and copper concentrations in the low-ppm range create crystal defects that degrade transistor performance.

Purity certification methods include GDMS (Glow Discharge Mass Spectrometry), which detects solid-sample impurities below 1 ppb and complies with ASTM E3061 and ISO 17025 standards, and ICP-MS (Inductively Coupled Plasma Mass Spectrometry) with matrix separation for liquid-phase verification. High-value shipments carry a Certificate of Analysis (COA) with GDMS results confirming each impurity element individually.

What Gallium Alloys Are Sold as Commercial Products?

3 gallium-based liquid metal alloys are commercially available as catalog products: Galinstan (gallium-indium-tin), EGaIn (eutectic gallium-indium), and various GaInSn thermal interface material formulations. All three remain liquid below room temperature or at room temperature, making them functional as mercury-free liquid metals for thermal and electrical applications.

Galinstan is the best-known gallium alloy. Its composition is 68.5% gallium, 21.5% indium, and 10.0% tin by mass. The pure eutectic melting point is approximately 11°C (52°F); commercial Galinstan formulations carry melting points as low as -19°C (-2°F). Galinstan is a registered trademark of Geratherm (Germany), the company that commercialized it as a non-toxic replacement for mercury in medical thermometers. Thermal conductivity runs 36-40 W/(m·K) - roughly 100 times higher than silicone thermal paste.

EGaIn (eutectic gallium-indium) contains approximately 75.5% gallium and 24.5% indium. Its melting point sits near room temperature at approximately 15.7°C (60.3°F), making it liquid in most operating environments. EGaIn is the material of choice for stretchable electronics and soft robotics: it can be drawn into wires slightly wider than a human hair while remaining electrically conductive through large deformations. EGaIn is biocompatible and self-healing - a severed EGaIn wire re-merges under slight pressure.

GaInSn thermal interface variants adjust the gallium-indium-tin ratio to tune melting point and thermal conductivity. With the addition of 4% volume nanoparticle fillers, GaInSn composite TIMs reach ~64.8 W/(m·K) - approximately 180% enhancement over the base alloy and 5-10x higher than polymer-based thermal pastes. Thermal resistance for GaInSn TIMs runs 1.5-6.5 mm²·K/W versus 20-50+ mm²·K/W for standard silicone compounds.

How Is Gallium Packaged and Why Does It Corrode Most Containers?

Gallium must be packaged in HDPE (high-density polyethylene) or polyethylene containers because it is chemically reactive with glass, aluminum, and most metals in liquid form. Liquid gallium diffuses into glass over time, corroding the silica network and weakening the container. Contact with aluminum is prohibited - gallium dissolves aluminum grain boundaries at room temperature in minutes, causing catastrophic structural failure. Most ferrous and copper alloy containers also corrode on contact with liquid gallium.

HDPE is chemically inert to gallium at temperatures below 50°C and provides the mechanical strength to withstand shipping stress. Quartz is an alternative for ultra-high-purity grades where even trace HDPE extractables are unacceptable, though quartz is expensive and fragile.

The 3.1% expansion on solidification is the critical packaging design constraint. All standard gallium containers are therefore either flexible (polyethylene squeeze bottles that deform under pressure) or partially filled, leaving headspace to absorb the solidification expansion. Bulk shipments use polyethylene-lined drums with designed expansion relief.

What Compound Precursors of Gallium Do Semiconductor Manufacturers Buy?

Semiconductor manufacturers buy 3 primary gallium chemical precursors: trimethylgallium (TMGa) for MOCVD reactor epitaxial growth, gallium trichloride (GaCl₃) for chemical synthesis, and gallium oxide (Ga₂O₃) powder for emerging ultra-wide bandgap device research. Each requires different handling, different purity certification, and a different supply chain from the bulk gallium ingot market.

Trimethylgallium (TMGa) is the MOCVD gallium source that deposits every commercial GaN and GaAs epitaxial layer worldwide. In the MOCVD process, TMGa flows as a vapor into a heated reactor chamber where it decomposes on a substrate wafer, depositing gallium atoms that combine with nitrogen (from ammonia) or arsenic to grow crystalline GaN or GaAs layers. TMGa is a pyrophoric liquid (ignites spontaneously in air) and is supplied in stainless steel bubbler cylinders. Nouryon (formerly Akzo Nobel High Purity Metalorganics), operating a facility in LaPorte, Texas, is the leading Western TMGa supplier. Vital Materials (China) supplies TMGa for Asian markets.

Gallium trichloride (GaCl₃) is a solid at room temperature - colorless, needle-like hygroscopic crystals that melt at 77.9°C and boil at 201°C. GaCl₃ exists as a dimer (Ga₂Cl₆) in the solid state. It serves as a Lewis acid catalyst in organic synthesis and as an intermediate in certain gallium purification and thin-film processes. GaCl₃ is packaged in glass ampules for small quantities and HDPE pails with polyethylene inner bags for bulk.

Gallium oxide (Ga₂O₃) powder is sold in 5 crystal phase variants (β, α, γ, δ, ε), with β-Ga₂O₃ the thermodynamically stable phase and the primary target for ultra-wide bandgap (4.8 eV) power semiconductor development. Companies including FLOSFIA (Japan), Novel Crystal Technology (Japan), and Kyma Technologies (USA) develop Ga₂O₃ devices, requiring high-purity Ga₂O₃ powder and Ga₂O₃ wafers as substrates. Ga₂O₃ powder is available at 4N-6N purity, packaged under argon to prevent hydroxide formation from atmospheric moisture.

Who Supplies Gallium in Each Form and at What Scale?

The gallium supply market divides into 3 tiers: Chinese primary producers controlling bulk 4N supply, specialty refinery companies offering 5N-8N grades, and retail distributors serving the collector and small research market. Chinese refiners produce 90%-98% of global primary gallium. Western specialty suppliers focus on the high-purity grades that Chinese refiners either cannot produce or are restricted from exporting.

Primary producers (bulk 4N-5N): Chinalco (Aluminum Corporation of China) - three gallium plants in Henan, Guangxi, and Guizhou with 200 metric tonne/year capacity - and Zhuzhou Keneng New Material, Vital Materials (Guangzhou), which serve LED and semiconductor markets.

High-purity specialty suppliers (5N-8N): 5N Plus (Montreal, Canada) using physical and chemical purification; AXT Inc. (USA) alongside GaAs and InP substrate business; American Elements (USA) with catalog 5N-8N ingots, shots, powder, and wire; Goodfellow (UK) for research institutions; and Western Minmetals SC Corporation with 5N, 6N, 7N via directional crystallization.

Retail and collector market (5g-500g): RotoMetals (99.99% gallium in 10g-1kg quantities online), Changsha Rich Nonferrous Metals (5g-1000g vials in 99.99% grade), and Amazon/eBay marketplace sellers (50g-100g with accessories).

China's December 2024 export ban to the United States disrupted the primary supply tier for U.S. buyers. Western specialty suppliers (5N Plus, AXT, American Elements) cannot replace Chinese primary output volume at 2024-2026 timescales. The gallium producers page covers refiner capacity and the gallium refining page explains how 4N metal becomes 6N compound semiconductor grade through zone refining, vacuum distillation, and fractional crystallization. For investment implications of form-specific gallium purchases, see the gallium investing guide.

Gallium Metal Forms: Quick Reference