Home Our Products Your Industry Contact Us INDUSTRY INVESTMENT CASTING CRUCIBLES CRUCIBLES OVERVIEW Crucibles Overview All crucibles, alumina, magnesia and zirconia to name a few, are manufactured in Capital's own modern purpose-built facility in the Czech Republic where we press, cast and fire various materials into crucibles. Product Range Isopressed Capital Refractories is able to supply a full range of isostatically pressed crucibles from 2 kg capacity to 75 kg, in different grades and qualities. We use a state-of-the-art semi-automated cold isostatic press. Cold isostatic pressing applies pressure to the workpiece in all directions producing products of uniform density. The advantages of Isostatically Pressed Crucibles are: Wide range of qualities Wide range of crucibles sizes Smooth internal surface giving a reduction of inclusions Consistent material properties throughout the crucible Defect free - no casting bubbles etc Uniform density throughout the product improving its resistance to thermal stress Vibrocast Crucibles are produced by vibration casting (vibrocast) when the required size or shape is uneconomical or impractical by the isopressing production method. Capital Refractories can offer a range of vibration cast crucibles, including T-Pot Ladles: Benefits Complex shapes, e.g. internal pouring siphon To complement our range of crucibles we also offer numerous ancillary products and materials used within the investment and related foundry industries. Description Quality Description Alumina ..... General purpose crucible with good resistance to acidic and basic slags. Used for a wide range of alloys. ..... AL97I Superior erosion resistance. ..... AL88I Improved thermal shock resistance. ..... AL90C Combines excellent strength and thermal shock resistance with low reactivity. ..... AL92C Superior thermal shock resistance. ..... AL97C High resistance to slags. Chrome Alumina ..... High resistance to slags. Preferred to alumina in more arduous applications. ..... CA93I Superior erosion resistance ..... CA84I Improved thermal shock resistance. ..... CA91I Specially formulated to withstand the most severe thermal shock applications. ..... CA93C Have a high resistance to slags and are preferred to alumina in more arduous applications. Magnesia ..... High resistance to basic slags. Used in vacuum melting of Ni, Co and Fe based alloys. ..... MG88I Used in vacuum melting of Ni, Co and Fe based alloys. ..... MG95 Resistant to the special alloys used in semi-conductor and sputter target industries. Mullite ML72I High thermal shock resistance. Resistant to basic slags. Zircon ZN66I Good resistance to acidic slags. It is used for non-ferrous and precious metals. Zirconia ..... High resistance to acidic slags. Used in the vacuum melting of superalloys and precious metals. ..... ZC93I General applications. ...... ZC95I High thermal shock resistance for noble metals. ...... ZC96I Fine grained structure for noble metals. ..... ZM94I Magnesia-stabilised with enhanced thermal shock resistance for superalloys. ..... ZY97I Suitable for cobalt & nickel superalloys. Sillimanite ..... High performance with good thermal shock resistance. ..... SL58C Good resistance to iron and nickel based alloys. ..... SL70C Good resistance to thermal shock with good hot strength and resistance to iron and nickel based alloys. Products suffixed "I" are isopressed, products sufficed "C" are cast. Chemistry Properties Brochure Download For all the latest information about our products and services you can view or download any one of our brochures. Please click the link below. Download Make an Enquiry For any questions or for more information, please contact us on the link below. We will get back to you as soon as possible. Contact us Have Your Say We’d love to hear your feedback about our website and our products. Click here to get in touch © 2021 Capital Refractories Limited Privacy and Cookie PolicyConditions of SupplyGeneral Conditions of Purchase UK Headquarters, Capital Refractories Limited, Station Road, Clowne, Chesterfield, S43 4AB, UK Tel: +44 (0) 1246 811163 Important Cookie Information. This site uses cookies to give you the best possible experience. By continuing to use the site you agree that we can save cookies on your device. Cookies are small text files placed on your device that remember your preferences and some details of your visit. Our cookies don’t collect personal information. For more information and details of how to disable cookies please read our updated privacy and cookie policy. Privacy and cookie policy I accept