Skip navigation Our Locations Contact Us Search Materials Products Markets Datasheets Resources News & Events About Us Homepage Products MACOR® Machinable Glass Ceramic MACOR® Properties MACOR® Properties MACOR® Machinable Glass Ceramic (MGC) has a continuous use temperature of 800oC and a peak temperature of 1000oC. Its coefficient of thermal expansion readily matches most metals and sealing glasses. It is non-wetting, exhibits zero porosity, and unlike ductile materials, won't deform. It is an excellent insulator at high voltages, various frequencies, and high temperatures. When properly baked out, it won't outgas in vacuum environments. MACOR® composition MACOR® machinable glass ceramic is a white, odorless, porcelain-like (in appearance) material composed of approximately 55% fluorophlogopite mica and 45% borosilicate glass. It has no known toxic effects; however, the dust created in machining can be an irritant. This irritation can be avoided by good housekeeping and appropriate machining techniques. MACOR® contains the following compounds: Material Approximate Weight Silicon - SiO2 46% Magnesium - MgO 17% Aluminum - AL2O3 16% Potassium - K2O 10% Boron - B2O3 7% Fluorine - F 4% Aluminum Silicate Property Units M-120F MACOR® Color Tan to Pink White Density G/CC 2.3 2.52 Porosity % Water Absorption 3 0 Flexural str. KPSI 9 13 Compressive str. KPSI 40 50 Hardness Knoop 500 250 Thermal cond. W/M°K W/M°C 1.3 1.46 Coefficient of linear thermal expansion 25° to 300°C 25° to 1500°C (X10-6) 3.3 9.3 Maximum use temp. °C 1150 1000 Vacuum atmosphere °C - Dielectric Str. Volts/Mil V/MMX 103 100 1000 Volume resistivity ohm-cm 25° >1014 >1016 Dielectric constant 1 MHZ 25°C 1 KHZ 25°C 5.3 - 6.03 Loss factor 1 MHZ 25°C 1 KHZ 25°C .053 .0047 Machining Machining tolerances are surprisingly tight, up to .0005". It can be machined to a surface finish of less that 20µin. and polished to a smoothness of 0.5µin.-Ra. Configurations are limited only by available equipment and the experience of the machinist. Sealing, joining and metallising MACOR® MGC can also be joined or sealed - both to itself and to other materials - in a number of ways; metallised parts can be soldered together and brazing has proven an effective method of joining the material to various metals; epoxy produces a strong joint, and sealing glass creates a vacuum tight seal. Even a straightforward mechanical joint is possible. It can be thick film metallised using metal inks, or thin film metallised by sputtering. Online ordering and quotation system Ordering your standard size MACOR® products is now a whole lot quicker and easier. New and current customers can use our shop and apply for a customer account today and make the order process even faster. To find out more about our MACOR® product range, or to place an order, please contact us. See our full trademarks list and contact details for our Intellectual Property team here. Contact Us Want to find out more? Contact Us In This Section Alumina Ceramic Components Ceramic Cores Ceramic Injection Moulded Components Ceramic to Metal Assemblies Extruded products Foundry Products Haldenwanger Products Healthcare Products Laser Products Macor Machinable Glass Ceramic Metallised Ceramic Components Quadrupole Components Semiconductor Products Silicon Nitride/ SSN E Components Vehicle Armour Wax Injection and Assembly Zirconia Ceramic Components MACOR® 13/04/2021 (0 languages) MACOR® Brochure 06/08/2019 (0 languages) We've offset our digital carbon footprint for 2021 We've offset our digital carbon footprint for 2021 Connect with us LinkedIn Facebook Twitter YouTube This website or its third party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. If you want to know more or withdraw your consent to all or some of the cookies, please refer to the cookie policy. Accept Cookie Policy