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We answer a lot of your questions on our wide range of industrial minerals in this section.

If you still have a question about a mineral or service that LKAB Minerals offers, please contact us.

  • What is the price/mt for MagnaDense?

    Please call or email the sales manager responsible for your area to obtain the most accurate price for MagnaDense. Please specify the quantity needed, the MagnaDense grade, the required packaging and the place of delivery. If you need any help determining this, your contact person will be happy to assist you.

  • Is MagnaDense magnetic?

    MagnaDense, manufactured from the natural Magnetite is ferri-magnetic. This means it won't attract other metals, but like steel, a magnet will stick to it. Magnetite has an approximately 99.5% magnetic content. This means that the magnetite particles can be easily recovered/positioned/steered using magnetism.

  • What concrete densities can be achieved with MagnaDense aggregate?

    Depending on the mix design you can reach concrete densities up to 4000 kg/m3 using only MagnaDense as an aggregate. For densities, up to 5000 kg/m3, a blend of MagnaDense and steel punchings can be used. Our sales managers are experienced in helping our customers to determine the right mix design for each project. Contact us to discuss the best solution in your case.

  • What sizes MagnaDense are available?

    We have different grades compared to the standards in the concrete industry due to our method of mining and the production of the mineral. We do have several grades that work very well together and create a good concrete mixture.

  • Can MagnaDense be used with all types of concrete additives?

    Yes, the most important is the cement that reacts with the additive. Therefore if regular cement is used, use the additives you are used to.

  • Is MagnaDense certified?

    Yes, MagnaDense has a CE certification and is a consistent product approved to EN12620.

  • Can MagnaDense be used with all types of cement?

    Yes, all types of cement from CEM I - V and CAC can be used together with MagnaDense. Contact us for help with the calculation of the right mix.

  • Can we pump high density concrete made from MagnaDense?

    Yes, the mix can be adjusted to be pumped. For help calculating the right high density concrete mix please contact the responsible regional sales manager. We have plenty of references to various types of concrete being pumped in many different conditions.

  • Other than density, does Magnetite impart any other properties in concrete?

    Yes, there are other properties that might be of benefit to concrete when using MagnaDense. MagnaDense acts as a heat sink reducing thermal cracking due to its heat capacity. This can also be beneficial in applications like geothermal heat. For particular applications, the fact that concrete becomes ferrimagnetic and therefore easily traceable can be interesting.

  • Does MagnaDense have any effect on concrete strength?

    Hardly. Strength is mainly influenced by water-cement ratio. The cement will glue the aggregates together. The only way the aggregates contribute is their particle shape and with MagnaDense having an angular particle shape it shows slightly better strengths than most regular aggregates but the difference is marginal.

  • Is MagnaDense toxic?

    No, MagnaDense is not toxic.

  • Is MagnaDense the same as magnetite or iron oxide?

    Magnetite is an iron ore/iron oxide. Not all iron ore/iron oxide is magnetite. These are terms used for a group of minerals where magnetite is one of them. MagnaDense is manufactured from the mineral magnetite. We mine large lumps of Magnetite (Iron oxide) from our mines in northern Sweden. We produce MagnaDense in specific sizes that fit the different industries we supply. LKAB, our mother company, manufactures and delivers upgraded iron ore products and services for iron manufacturing.

  • Do we need to take precautions for the formwork?

    Please consider a higher pressure on the formwork. Additional anchoring or ties might be needed when using MagnaDense in your project. This is all related to the final concrete density used and height of the pour.

  • Can we blend MagnaDense with other aggregates?

    Yes, you can blend MagnaDense with all known aggregates. To help you get the right mix for your concrete density, please contact your regional sales manager by phone or email.

  • Can truckmixers be fully loaded with high density concrete?

    Yes, truck mixers can be fully loaded with their max weight which means for heavyweight concrete that they should not load their regular volume as that would lead to too much weight. Check the regulations for your truck mixers to determine the maximum volume.

  • Does MagnaDense increase tear and wear?

    No, not really as the SiO2 content is low and Silica is more responsible for increased tear and wear.

  • Is MagnaDense colouring our concrete plant and equipment?

    It is hardly visible. MagnaDense is grey/black and as a result, the final concrete will look slightly darker grey than regular concrete.

  • Will MagnaDense corrode?

    MagnaDense is an iron oxide (Fe3O4) which means it is an oxidised material by nature. MagnaDense is a very stable mineral which can be considered inert under natural circumstances.

  • What is the density of MagnaDense?

    Depending on the grade, the particle density for MagnaDense is 4.7 – 5.1 t/m3 (293 -318 lbs/cu-ft). Please contact LKAB Minerals to help you determine the right bulk density, saturated density, submerged density or density you can achieve in concrete for your particular project.

  • Do you have mixes for concrete with the specific classes?

    We have a lot of experience with all different kinds of concrete mixtures going from earth-dry to very plastic and with different strengths and environmental classes. We are here to help you find the best mixture for your specific project. Please contact us to discuss the details.

  • What is the correlation / difference between particle density and specific gravity?

    Specific gravity (as used in the USA to state a material's density in relation to that of water at 4°C) varies from 4.7 to 5.1.

  • What is the density correlation between European standard [kg/m3] (kilogram per cubic meter) and US standard [lbs/cu-ft] (pound per cubic feet)?

    The conversion rate between lbs/cu-ft and kg/m3 is as follows: [lbs/cu-ft] = [kg/m3]x 62.42796. All data sheets are available with US units lbs/cu-ft, please contact your local sales manager.

  • What solutions do you offer to US standard sizing for concrete mixing?

    We can offer different grades of MagnaDense depending your required heavy concrete mixture. We have different grades compared to the standards in the concrete industry due to our method of mining and the production of the mineral. We do have several grades that work very well together and create a good concrete mixture. Contact us for more details related to your next project.

  • Can you indicate what the approximate MagnaDense volume per concrete volume for different concrete densities is?

    The volume of MagnaDense used in a specific volume of high-density concrete varies depending on the mix design. Please contact your local sales manager to discuss the right mixture for your project.

  • How expensive MagnaDense concrete in comparison with normal concrete?

    MagnaDense is an aggregate and forms part of the final high-density concrete prices. This will depend on local situations. Using high-density concrete can have cost and time savings and a positive impact on the environment and your sustainability goals. Please contact us to discuss the benefits of MagnaDense in your particular project.

  • Does MagnaDense have any effect on concrete strength?

    Concrete strength is mainly influenced by water-cement ratio.

  • What is UltraCarb?

    UltraCarb products are made from rock deposits rich in hydromagnesite and huntite. Hydromagnesite has the formula Mg5(CO3)4(OH)2.4H2O and can be described as a hydrated magnesium carbonate. Huntite has the formula Mg3Ca(CO3)4 and can be described as a magnesium calcium carbonate.

  • What is HMH?

    HMH is an acronym for hydromagnesite huntite.

  • How much UltraCarb can I add to my polymer?

    With the proper equipment, up to 65% by weight of UltraCarb can be compounded in a polymer. Compounding guidelines and advice are available upon request with your contact person. You can reach us via the UltraCarb product page. Select your country to display the nearest UltraCarb sales manager.

  • What is UltraCarb used for?

    UltraCarb is a halogen-free flame retardant filler for polymers and rubbers.

  • Does UltraCarb contain halogens?

    No. UltraCarb is a halogen-free flame retardant filler.

  • Where does UltraCarb come from?

    LKAB Minerals´ deposits of hydromagnesite and huntite are situated in the south-western region of Turkey near the city of Denizli. Processing plants are located near the ports of Izmir in Turkey and Hull in the United Kingdom.

  • In which countries do you sell UltraCarb?

    UltraCarb is available globally and sold through our local offices, please visit the product page on our website to get your nearest contact.

  • Do you supply compounds with UltraCarb?

    No. LKAB Minerals is the supplier of UltraCarb to many compounding companies that have built a lot of expertise.

  • What is the decomposition or reaction temperature of UltraCarb?

    UltraCarb starts to release water at 220°C. The decomposition process continues to a temperature of 550°C with a total loss in mass of 52%. The process is endothermic and absorbs approximately 1000 J per gram.

  • Is UltraCarb only used as a flame retardant filler?

    UltraCarb is also used to promote char formation. UltraCarb particles accumulate at the retreating molten polymer surface to form a stable cementitious char. This char further inhibits the combustion process and propagation of the fire from burning droplets.

  • Is UltraCarb environmentally friendly?

    Advanced natural fire retardant mineral fillers are environmentally preferable to chemically produced alternatives. LKAB Minerals commissioned an evaluation of the environmental impact of UltraCarb in conformance with the ISO 14040–14044 method and found that when compared to chemically produced flame retardant fillers, such as aluminium hydroxide, greenhouse emissions, and energy consumption is 40% to 45% lower.

  • What is the shelf life of UltraCarb?

    If UltraCarb is stored in dry conditions there is no measurable change in the product.

  • How many different types of UltraCarb do you offer?

    There are currently four basic UltraCarb products available. In addition, these grades are also available with two different types of surface treatment. Please contact your nearest sales manager through the UltraCarb product page.

  • Why are surface treatments offered for UltraCarb products?

    Surface treatments modify the interactions between the individual UltraCarb particles and between UltraCarb and the polymer matrix it is mixed into. This can lead to improvements in dispersion quality and fire retardancy.

  • What is the difference between the different types of UltraCarb?

    UltraCarb products are differentiated by 3 physical characteristics:
    • Mineral composition
    • Particle size
    • Surface modification
    The amount of hydromagnesite and huntite is fixed at two different levels for the UltraCarb "LH" and UltraCarb "1200" series respectively. The "LH" series contains more than 60% hydromagnesite whereas in the "1200" series huntite is the main mineral fraction. The actual amount of hydromagnesite and huntite in each product series is defined in internal production specifications.

  • How do you control UltraCarb composition as a natural mineral?

    LKAB Minerals has a deep and detailed understanding of its hydromagnesite and huntite mineral deposits. This means the mineral composition of the raw material feeds used for UltraCarb can be precisely controlled as part of the manufacturing process.