{"id":1490,"date":"2026-05-30T21:04:07","date_gmt":"2026-05-30T18:04:07","guid":{"rendered":"https:\/\/cfc.codev-eg.com\/?page_id=1490"},"modified":"2026-06-03T02:14:59","modified_gmt":"2026-06-02T23:14:59","slug":"degassing-tablet","status":"publish","type":"page","link":"https:\/\/cfc.codev-eg.com\/tr\/products\/metallurgical-chemicals\/non-ferrous-metal-treatment\/copper-treatment\/degassing-tablet\/","title":{"rendered":"Degassing tablet"},"content":{"rendered":"\t\t
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Division 01 \u2014 Metallurgical \/ Non-Ferrous \/ Copper \/ Degassing\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Degassing\nTablet<\/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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Dissolved hydrogen is the primary cause of gas porosity in copper alloy castings. Hydrogen enters the melt from moisture in the charge material, from wet or damp crucibles, and from atmospheric humidity during the melting and holding cycle. At pouring temperature, the metal holds the hydrogen in solution; as the casting solidifies and the solubility drops sharply, the hydrogen precipitates as gas bubbles \u2014 producing gas porosity distributed through the casting cross-section. For pressure-rated castings such as pump impellers, valve bodies, and marine bronze fittings, gas porosity is a direct rejection cause under hydrostatic testing. EGYTAB CU copper degassing tablets from CFC Egypt provide a simple, reliable, and consistent method for removing dissolved hydrogen from the melt immediately before each pour. The pre-measured tablet format eliminates the dosing variability of hand-added granular degassing agents, and the plunging method ensures complete distribution of the degassing reaction through the full melt volume. EGYTAB CU is manufactured at our Sadat City plant and is used in both induction furnaces and oil- or gas-fired crucible furnaces.\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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EGYTAB CU addresses the complete degassing requirement for copper and copper-alloy melts \u2014 from the mechanism of hydrogen removal through to application method and use in combination with EGYFLUX CU copper fluxes.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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How EGYTAB CU Works\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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EGYTAB CU is plunged to the base of the melt using a preheated steel rod. On contact with the molten copper alloy, the tablet decomposes and releases gas that forms fine bubbles distributed throughout the bath. These bubbles rise through the melt and collect dissolved hydrogen by diffusion as they ascend, carrying it to the melt surface where it escapes. The result is a melt with substantially reduced dissolved hydrogen content, which solidifies without the gas porosity caused by hydrogen precipitation during solidification.\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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Pre-Measured Dosing Consistency\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Each EGYTAB CU tablet contains a precisely measured quantity of degassing compound for a defined melt weight. The pre-measured format eliminates the variability of hand-added powder or granule \u2014 under-dosing leaves residual hydrogen that causes porosity; over-dosing causes excessive gas evolution and melt splashing. Consistent tablet dosing allows gas porosity to be controlled as a process parameter rather than left to chance, and the number of tablets per heat can be documented as part of the casting process record.\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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Induction & Crucible Furnace Compatibility\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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EGYTAB CU is formulated for use in both induction and oil- or gas-fired crucible furnaces. In induction furnace applications, electromagnetic stirring assists the distribution of degassing bubbles through the melt. In crucible furnaces, the tablet is plunged using a preheated rod and held at depth for the full degassing reaction time before withdrawal. The plunging rod must be preheated to avoid introducing moisture \u2014 the source of the hydrogen the treatment is designed to remove.\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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Use with EGYFLUX CU Covering Flux\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Degassing and flux covering address two distinct but related aspects of copper melt quality. EGYFLUX CU covering flux prevents surface oxidation and captures oxide impurities throughout the melt cycle. EGYTAB CU removes dissolved hydrogen immediately before the pour. Both treatments are necessary for castings that must be both oxide-inclusion-free and gas-porosity-free. The standard sequence is: flux throughout the melt and hold; skim the flux-slag layer before degassing; plunge EGYTAB CU; allow reaction to complete; pour. Contact our technical team for the correct combined treatment procedure for your alloy and furnace type.\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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EGYTAB CU degassing tablets are used in every application where copper alloy castings must be free of gas porosity \u2014 which is the requirement for all pressure-rated and structurally critical copper castings.\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Marine Bronze \u2014 Pressure-Tight Castings\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Marine propellers, sea valves, through-hull fittings, and pump casings in tin bronze and aluminium bronze must be free of gas porosity throughout their cross-section. A single gas void in a sea valve or hull fitting below the waterline is a serious defect. Marine classification societies require documented melt treatment \u2014 including degassing \u2014 as part of the casting certification process. EGYTAB CU degassing before every pour is standard practice in bronze foundries producing to classification society requirements.\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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Valves & Pump Casings\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Bronze and brass pump casings, valve bodies, and fittings for water, gas, and chemical service are pressure-tested to rejection criteria that include any porosity that allows leakage. Gas porosity \u2014 caused by dissolved hydrogen in the melt \u2014 is one of the two principal causes of hydrostatic test failure in copper alloy castings, alongside oxide inclusions. Degassing with EGYTAB CU on every heat eliminates gas porosity as a defect variable, allowing the foundry to focus quality control on other variables in the casting process.\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 & Bushings\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Phosphor bronze and gunmetal bearings and bushings must have sound internal structure \u2014 gas porosity beneath the bearing surface acts as a stress concentration and initiates fatigue failure under the cyclic loading of bearing service. For centrifugally cast bearing tubes, gas porosity that breaks through to the bore surface creates machining voids that reduce the effective bearing area and accelerate wear. EGYTAB CU degassing is specified for bearing tube and bushing production where internal soundness standards are applied.\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 electrical applications \u2014 busbars, switch contacts, and electrode holders \u2014 require dense, pore-free metal throughout the section. Gas porosity in electrical copper reduces cross-sectional area and increases resistance at the void location, creating localised heat generation under load. For copper-chromium and copper-zirconium alloys used in high-current contact applications, proper degassing treatment is essential for achieving the conductivity and mechanical properties required by specification.\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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Decorative & Architectural Bronze\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Decorative bronze and brass castings \u2014 architectural hardware, sculptures, commemorative plaques, and door furniture \u2014 require a defect-free surface that can be polished, plated, or patinated without revealing subsurface gas voids. Gas porosity that breaks through to the casting surface appears as pitting after mechanical polishing \u2014 a defect that ruins the surface appearance and requires expensive repair or rejection. EGYTAB CU degassing prevents subsurface gas blisters that would otherwise appear during finishing.\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 Degassing Tablet Product\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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EGYTAB CU \u2014 pre-measured compact degassing tablets for copper, bronze, and brass melts. 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 alloy degassing answered plainly. For dosing rates and application guidance for your specific alloy and furnace type, 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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Why do copper alloy melts need degassing? <\/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 and its alloys absorb hydrogen from moisture in the charge material, from damp crucibles, and from atmospheric humidity during melting and holding. Dissolved hydrogen remains in solution at elevated temperatures but precipitates as gas bubbles when the metal solidifies and solubility drops sharply. This causes gas porosity \u2014 internal voids distributed through the casting cross-section \u2014 that reduces mechanical properties and causes leaks under hydrostatic pressure testing. EGYTAB CU removes dissolved hydrogen from the melt before the pour, preventing gas porosity from forming in the solidified casting.\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 does EGYTAB CU work? <\/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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EGYTAB CU is plunged to the base of the melt using a preheated steel rod. On contact with the molten copper alloy, the tablet decomposes and releases gas that forms fine bubbles distributed throughout the bath. These bubbles rise through the melt and, by diffusion, collect dissolved hydrogen from the surrounding metal as they ascend. The hydrogen-laden bubbles reach the melt surface and the hydrogen escapes. The result is a melt with significantly reduced dissolved hydrogen content, which solidifies without gas porosity. The pre-measured tablet format ensures consistent dosing for a given melt weight without the variability of hand-added powder.\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 EGYTAB CU is needed per kilogram of 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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EGYTAB CU dosing is based on melt weight. Standard dosing rates and tablet sizes are specified on the product data sheet and are matched to common crucible and furnace charge weights. Because EGYTAB CU is a pre-measured tablet, the number of tablets added per heat is easily controlled and recorded as part of process documentation. Contact our technical team for dosing confirmation based on your specific melt weight, alloy type, and furnace configuration.\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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Does degassing need to be done on every heat? <\/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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For pressure-rated copper alloy castings \u2014 pump casings, valve bodies, marine bronze fittings \u2014 degassing before every pour is standard practice and is typically required by quality procedures and customer specifications. The hydrogen level in the melt varies with charge moisture, atmospheric humidity, and crucible condition \u2014 all of which change from heat to heat. Consistent degassing on every heat is therefore the most reliable approach to eliminating gas porosity as a defect mode in pressure-critical copper alloy castings.\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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Can EGYTAB CU be used in induction furnaces and crucible furnaces? <\/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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EGYTAB CU is suitable for use in both induction furnaces and oil- or gas-fired crucible furnaces. In induction furnace applications, electromagnetic stirring assists the distribution of degassing bubbles through the bath. In crucible furnaces, the tablet is plunged using a preheated steel rod and held at depth for the full degassing reaction time before withdrawal. The plunging rod must be preheated to avoid introducing moisture into the melt \u2014 the source of the hydrogen being removed. Both application methods are described in the EGYTAB CU product data sheet.\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