{"id":1488,"date":"2026-05-30T21:03:57","date_gmt":"2026-05-30T18:03:57","guid":{"rendered":"https:\/\/cfc.codev-eg.com\/?page_id=1488"},"modified":"2026-06-03T02:11:06","modified_gmt":"2026-06-02T23:11:06","slug":"copper-fluxes","status":"publish","type":"page","link":"https:\/\/cfc.codev-eg.com\/fr\/products\/metallurgical-chemicals\/non-ferrous-metal-treatment\/copper-treatment\/copper-fluxes\/","title":{"rendered":"Copper fluxes"},"content":{"rendered":"\t\t
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Division 01 \u2014 Metallurgical \/ Non-Ferrous \/ Copper \/ Fluxes\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Copper\nFluxes<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Covering, oxidising, and deoxidising flux powders applied to the surface of molten copper and copper-alloy melts \u2014 forming a protective liquid layer that prevents atmospheric oxidation, captures cuprous oxide and other impurities, and suppresses zinc vapour loss in brass for clean, inclusion-free pours.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Copper and its alloys are among the most reactive metals in common foundry use. Molten copper oxidises rapidly on contact with atmospheric oxygen, forming cuprous oxide (Cu2O) that disperses throughout the melt and, if not removed, casts as non-metallic inclusions that reduce mechanical properties and block porosity testing. In brass, zinc evaporation from the melt surface above 950 \u00b0C causes surface porosity, composition drift, and white fume that is a health and housekeeping concern. CFC Egypt's EGYFLUX CU copper flux range \u2014 four grades covering the full spectrum of copper alloy types and melting temperatures \u2014 addresses these problems at source. Applied as a powder or granule to the melt surface, EGYFLUX CU fluxes melt and spread to form a continuous protective barrier that prevents oxidation, coalesces dispersed oxide into a skimmable slag layer, and actively suppresses zinc vapour loss in brass melts. All four grades are manufactured at our Sadat City plant.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
\n\t\t\t\t\t\n\t\tRequest a quote\n\t<\/a>\t\t\t\t\t\n\t\tCopper treatment overview\n\t<\/a>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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What It Covers\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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The EGYFLUX CU range provides covering, protective, and cleaning flux chemistry for the principal copper alloy families \u2014 from general-purpose copper and tin bronze through to brass and chromium-containing copper alloys.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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General Purpose \u2014 EGYFLUX CU\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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EGYFLUX CU is the standard covering and protective flux for copper, tin bronze, gunmetal, and the common copper alloy families. It melts at copper-alloy melting temperatures to form a fluid, protective layer on the bath surface, preventing atmospheric oxidation and coalescing dispersed cuprous oxide into a skimmable slag. It is the starting-point flux grade for copper foundries treating standard alloy grades in induction or oil-fired furnaces.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Mid-Temperature \u2014 EGYFLUX CU 500\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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EGYFLUX CU 500 is formulated for copper alloys melted in the 900\u20131050 \u00b0C temperature range. Its flux chemistry is balanced to melt and provide fluid surface coverage at these temperatures without premature decomposition or insufficient melting. It is used for tin bronze, phosphor bronze, and other mid-melting-point copper alloys where precise flux melting behaviour at the operating temperature is required for optimal coverage and oxide capture.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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High-Temperature \u2014 EGYFLUX CU 900\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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EGYFLUX CU 900 is designed for high-temperature copper alloys including copper-nickel alloys, aluminium bronze, and pure copper applications where the melt temperature approaches or exceeds 1100 \u00b0C. At these temperatures, standard flux grades may decompose prematurely or fail to maintain fluid surface coverage. EGYFLUX CU 900 chemistry is formulated for stability and effective coverage at elevated temperatures, providing oxidation protection and oxide capture throughout the melting and holding cycle.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Chromium Alloys \u2014 EGYFLUX CU CR\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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EGYFLUX CU CR is a specialist flux for copper-chromium and copper-chromium-zirconium alloys where the presence of chromium creates specific oxide chemistry challenges. Chromium oxidises preferentially from the melt surface, forming chromium oxide (Cr2O3) \u2014 a highly refractory, non-wetting oxide that standard copper flux chemistry cannot effectively capture. EGYFLUX CU CR is formulated to dissolve and capture chromium oxide alongside cuprous oxide, maintaining a clean melt surface and preventing Cr2O3 inclusions in the solidified casting.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Where It's Used\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Copper flux is used wherever copper alloys are melted \u2014 in induction furnaces, oil-fired crucible furnaces, and channel furnaces \u2014 across the sectors that produce copper-alloy castings.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Marine & Naval Bronze Castings\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Propellers, sea valves, through-hull fittings, and pump bodies in tin bronze and aluminium bronze require pressure-tight, porosity-free metal throughout the casting cross-section. Marine classification societies require clean metal \u2014 free of oxide inclusions and gas porosity \u2014 as a condition of certification. EGYFLUX CU provides the melt protection needed to achieve the metal cleanliness demanded by marine casting standards when used consistently throughout the melting and holding cycle.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Bronze Valves, Pumps & Fittings\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Bronze and brass pump casings, valve bodies, and pipe fittings for water, gas, and chemical service must pass pressure testing and dimensional inspection. Oxide inclusions entrained from a poorly protected melt produce micro-pores in the casting that become leak paths under pressure. Effective flux coverage from charge to pour eliminates the oxide particles that cause these defects, producing consistently pressure-tight castings that pass hydrostatic testing without repair.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Brass Castings \u2014 Zinc Retention\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Brass foundries face the additional challenge of zinc evaporation. Zinc begins to vaporise significantly above 950 \u00b0C, reducing the zinc content of the melt below specification and causing surface porosity on the casting face where zinc vapour has condensed and been entrapped. An EGYFLUX CU flux layer on the melt surface physically prevents zinc vapour from escaping by maintaining an impermeable liquid barrier between the melt and the atmosphere throughout the hold and pour cycle.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Phosphor Bronze Bearings & Wear Parts\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Phosphor bronze and gunmetal bearings, worm wheels, and wear bushings are used in industrial gearboxes, marine propulsion systems, and hydraulic machinery. These components are loaded in service \u2014 subsurface oxide inclusions act as stress concentrations and initiation sites for fatigue cracks, reducing service life under cyclic loading. Sound, inclusion-free metal produced with proper flux coverage is the foundation of long service life in bearing and wear-part bronze castings.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Electrical & High-Conductivity Copper\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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High-conductivity copper castings for busbars, switch contacts, and electrical connectors require clean metal \u2014 oxide inclusions and gas porosity reduce electrical conductivity and weaken the casting at contact points. For high-temperature melting of pure copper and copper-chromium-zirconium alloys used in electrical applications, EGYFLUX CU 900 and EGYFLUX CU CR provide the protection and oxide capture needed to maintain specification conductivity in the finished component.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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CFC Copper Flux Products\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Four EGYFLUX CU grades for the full range of copper alloy types and melting temperatures. All manufactured in Sadat City, Egypt.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Frequently Asked Questions\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Technical questions on copper flux selection and application answered plainly. For a grade recommendation matched to your alloy and process, contact our technical team.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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What does a copper flux do and why is it necessary? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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A copper flux is applied to the surface of a molten copper or copper-alloy melt to form a protective liquid layer that prevents the metal from contacting the atmosphere. Without flux protection, copper alloys oxidise rapidly, forming cuprous oxide (Cu2O) that becomes entrained as non-metallic inclusions in the casting, reducing tensile strength, ductility, and pressure tightness. In brass, zinc evaporates above about 950 \u00b0C, causing surface porosity and composition drift. An EGYFLUX CU flux layer prevents oxidation, captures oxide impurities in a skimmable slag, and suppresses zinc vapour loss.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t
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What is the difference between EGYFLUX CU, CU 500, CU 900, and CU CR? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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The four EGYFLUX CU grades are formulated for different alloy types and melting temperatures. EGYFLUX CU is the general-purpose covering flux for standard copper alloys including tin bronze and gunmetal. EGYFLUX CU 500 is optimised for the 900\u20131050 \u00b0C range (tin bronze, phosphor bronze). EGYFLUX CU 900 is designed for high-temperature alloys including aluminium bronze and pure copper above 1100 \u00b0C. EGYFLUX CU CR is a specialist grade for copper-chromium and copper-chromium-zirconium alloys where chromium oxide capture requires specific flux chemistry. Contact our technical team with your alloy grade and melting temperature for a specific recommendation.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t
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How much flux should be applied to a copper alloy melt? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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Sufficient flux should be applied to form a continuous, fluid coverage of the melt surface \u2014 typically 0.3\u20130.8% of melt weight for routine covering and protection. Higher addition rates may be required when melting heavily oxidised or contaminated charge material, or when extended holding periods expose the melt to the atmosphere. Flux should be applied progressively during melting and skimmed before pouring. Contact our technical team for addition rate recommendations matched to your furnace, alloy, and melt weight.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t
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Is the flux different for brass versus bronze versus pure copper? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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Yes. Pure copper and tin bronze require a covering and protective flux that is fluid at 1000\u20131100 \u00b0C. Brass requires a flux that specifically suppresses zinc vapour loss and is stable at brass melting temperatures around 900\u2013950 \u00b0C. Aluminium bronze requires a flux capable of capturing aluminium oxide \u2014 a particularly refractory and tenacious oxide. Copper-chromium alloys need EGYFLUX CU CR to capture chromium oxide. The correct EGYFLUX CU grade depends on your alloy type, and our technical team will confirm the appropriate selection.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t
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How is copper flux applied in practice? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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Copper flux is sprinkled as a powder or granule onto the surface of the molten metal in the crucible or furnace as the charge melts, and replenished as needed throughout the melt cycle. The flux melts and spreads to form a continuous protective layer. Before pouring, the flux-slag layer \u2014 which contains captured oxide impurities \u2014 is skimmed from the metal surface using a preheated skimmer. The metal is then ready for degassing (if required with EGYTAB CU tablets) and pouring. Flux should not be added immediately before the pour as there is insufficient time for it to melt and be skimmed.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t