◆Introduction:
Noah®5112 metal protection products, at normal temperature, is colorless, transparent and insulating liquid. Noah®5112 metal protection products is designed as replacements for ozone depleting substances (ODSs) and materials with high global warming potentials (GWPs). Noah®5112 metal protection products is an ideal replacement for sulfur hexafluoride (SF6), widely used as a “cover gas” to prevent molten magnesium from burning during casting processes. With a global warming potential 22,800 times that of carbon dioxide (CO2), SF6 is the most potent greenhouse gas known. It has been targeted for significant emission reduction under the Kyoto Protocol and by European regulations. The U.S. Environmental Protection Agency (EPA) has set a goal of eliminating its use in magnesium casting by the end of 2010.
Noah®5112 fluid strikes a balance of properties not offered by other potential replacement technologies. Hydrofluorocarbons (HFCs) such as HFC-134a can be used as cover gas agents, but these materials are also considered greenhouse gases, and are targeted for reduction under the Kyoto Protocol. HFCs, including HFC-134a, are now the subject of negotiations for a global production phase-down under the Montreal Protocol. Although sulfur dioxide (SO2) was widely replaced by SF6 in magnesium casting processes because of its toxicity and corrosive properties, it is still used in some regions.
Noah®5112 fluid is a safe, sustainable cover gas for magnesium casting operations. It has been demonstrated to provide excellent protection for molten magnesium at operating costs comparable to SF6, while enabling greater than 99% reduction in greenhouse gas emissions..
◆Physical properties of Noah®5112:
Molecular mass | 316.045 |
Boiling point at 1atm | 49.2℃ |
Freezing point | -108℃ |
Critical temperature | 168.7℃ |
Critical pressure | 18.65 Bar |
Critical density | 639.1 kg/m3 |
Heat of vaporization at boiling point | 88.0 kJ/kg |
Liquid Viscosity @25℃ | 0.524 cp |
Solubility of water in Noah5112 @25℃ | <0.001 wt% |
Specific heat，liquid@25℃ | 1.013 kJ/kg ℃ |
Specific heat capacity at room temperature@25℃,1atm | 0.0733m3/kg (1.175ft3/lb). |
Saturated liquid density（25℃） | 1.60 g/ml |
Vapor pressure（25℃） | 0.404 bar |
Insulating property (110k) | 3.8mA (Standard leakage current≤10mA) |
Dielectric strength (kV) | 74.6 kV (Test distance 3mm) |
ODP | 0 |
GWP | 1.0 |
ALT(year) | 0.014 |
◆Environmental, Health, and Safety
The environmental properties of Noah®5112 fluid differentiate it from other fluorinated cover gas agents. Its short atmospheric lifetime of 5 days results in a GWP of 1, which is equivalent to CO2. When used to replace SF6 in casting applications, greenhouse gas emissions can be reduced by more than 99% and by more than 68% when used to replace HFC-134a.
The safety of Noah®5112 fluid has been determined by both Noah and independent laboratories. Studies have revealed very low toxicity in both acute and repeated dose testing. The No Observed Adverse Effect Level (NOAEL) for all endpoints of acute toxicity is 10% (100,000 ppmV) based on a cardiac sensitization study and a four hour acute inhalation study.
The 8-hour time weighted average (TWA) exposure guideline for Noah®5112 fluid is 150 ppmV. On this basis, foreseeable use under normal operating conditions results in a large margin of safety between anticipated exposures and the exposure guideline. This margin of safety contrasts with the precautions needed when SO2 (TWA = 2 ppmV) is used in cover gas applications. (Substantial investment in engineering controls and worker training and personal protection equipment must be considered with SO2 due to its toxicity.)
◆Cover Gas Applications
When evaporated into a suitable carrier gas, Noah®5112 fluid is an effective cover gas agent for the protection of molten magnesium. Typical processes where Noah®5112 fluid provides excellent protection include various types of melting furnaces and casting operations, including:
• Open casting of ingots, direct chill casting, sand casting or investment casting
• High pressure die casting with hot or cold chamber melting furnaces
• Preparation of alloys from pure magnesium or other alloys
• Remelting of scrap from casting processes
◆Cover Gas Performance
Noah®5112 fluid has been shown to protect pure magnesium or its alloys at melt temperatures from 650°C to 800°C (1170°F to 1450°F) in furnaces and during casting operations. Providing melt protection similar to SF6,the Noah®5112 agent forms a thin, flexible surface film that prevents surface oxidation. Noah®5112 fluid is significantly more reactive at melt temperatures and thus more efficiently utilized than SF6. This efficiency allows it to be used at very low concentrations and nearly eliminates greenhouse gas emissions contributed by the cover gas agent. U.S. EPA studies of emissions from magnesium die casting and ingot casting operations have shown that Noah®5112 fluid concentrations of only about 10% that of SF6 are needed, and nearly all of the Noah®5112 agent added is
consumed in the process. GHG emissions are reduced by over 99%. Nearly all of the GHG emitted with Noah®5112 formulations is the CO2 carrier gas. The table shows data for a die casting and an ingot casting study where SF6 and Noah®5112 fluid were run in the same process and equipment.
FAQ
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Small production: 3-4 days Mass production :7-15days or basing on your qty.
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