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Microsilica for shaped refractory products

Tailoring the performance of shaped refractory bricks with microsilica

Refractories: Meeting every challenge with a wide range of materials and formats

Shaped refractory products are used as prefired ‘building blocks’ of various sizes and shapes, and are installed using standard masonry techniques.

The advantage of shaped products or refractory bricks is that they can be customized in terms of size and material content to adapt to temperature profiles and thermal variations, to protect against corrosion and slag, to repel melted materials in contact with the refractory lining, and to be fitted to the geometrical parameters of the shell.

Shaped products also allow for a wide choice in installation processes, taking into account economic factors such as cost of materials, equipment required, labour costs, work legislation and contractual or regulatory requirements, as well as time constraints and the availability of installation skills and local service providers.

Microsilica, a microscope view

The performance of shaped products can be customized with microsilica to meet specific processing and end-product features and offer refractory manufacturers the added advantage of being pre-tested off-site to ensure they meet customer applications before installation.

This allows manufacturers to choose exactly the forms they need in terms of size, format, physical performance and chemical resistance in the refractory shell, to ensure the integrity of critical parts at high temperatures and variable heating/cooling cycles, resisting chemical corrosion and mechanical stress. Shaped parts manufacturers can also use additives to improve flow of dry powder, improve densification and obtain millite/forsterite formation at high temperatures.

ELKEM MICROSILICA®: The quality benchmark for high-performance shaped products

Elkem, the global leader in microsilica technology, provides a wide choice of ELKEM MICROSILICA® products for shaped parts. These customized co-products of silicon or ferrosilicon manufacturing are composed of ultrafine, amorphous spheres of silicon dioxide (SiO2) and feature high-purity properties, which can have a strong impact on the specific performance requirements of various high temperature applications.


Here is a non-exhaustive list of our product offering for the making of shaped products, many of which are also appropriate for castables (unshaped products) and prefabricated pieces:

Silicon based materials for refractories​

Elkem Microsilica® 971

The ELKEM MICROSILICA® 971 product, a high quality, purpose-made, low-impurity grade, for versatile applications in refractories, available in densified (D) or undensified (U) form, to be used in advanced refractory products such as self-flowing, low, ultra-low and no-cement castables.
Product data sheet

Elkem Microsilica® HQ

The Elkem Microsilica® HQ product is a cost-effective alternative for low cement castables, with controlled and stable chemical composition, based on low alkalis and higher reactivity.

Product data sheet

Elkem Microsilica® 968

The ELKEM MICROSILICA® 968 product, a cost-effective alternative for low cement castables, featuring a controlled and stable chemical composition.
Product data sheet

Elkem Microsilica® 955

The Elkem Microsilica® 955 product, a medium-quality grade silica fume with tight specification limits based on in-process control, resulting in higher silica content and reduced impurities.
Product data sheet


Designed for microsilica-containing LCC and ULCC, based on Al2O3 - SiO2 system with quick wet-out and low water demand.

Product data sheet


Designed to act as an accelerator in undispersed aluminosilicate systems like dry gunning LCC and ULCC mixes without clay.

Product data sheet



 Designed for microsilica-gel bonded systems (NCC) to control the working and demoulding time and to develop high green-strength at room temperature.

Product data sheet


Designed to work as a multi-functional microsilica dispersant, for aluminosilicate LCC, ULCC and NCC, giving customers freedom to fine-tune their products with other additives (accelerators, retarders, etc.). It enhances the rheological properties, reduces the water demand and increases the flow. Suitable also for shotcreting.

By combining both SioxX®-Flow and SioxX®-Set products, setting can be controlled. SioxX®-Flow product will also work in combination with Silica-Sol (colloidal silica) in NCC to control flow, working and setting time.When used in silica-sol systems a separate gelling agent needs to be added.

Product data sheet


Designed for undispersed systems mainly for NC gunning mixes. Can also be used for LC and ULC gunning. In castables and shotcrete (dispersed systems) SioxX®-Set can be used as accelerating agent.

Product data sheet


SioxX®-Ten / SioxX®-Ten PLUS

SioxX®- Ten and SioxX®- Ten PLUS are primarily designed for ultra low cement alumina-based or microsilica-gel bonded no-cement castables.
SioxX®- Ten mainly works at the range of 800-1100ºC, while SioxX®- Ten PLUS is recommended to work at the range of 600-900ºC.
Both of them enhance the rheological properties, reduce the water demand, increase the flow, control the working and de-moulding time, help develop high green strength as well as high strength at the indicated working range of temperature.

Product data sheet

SioxX® Mag

Designed for basic (MgO-based) refractory castables, to help avoid inherent problems of crack formation and poor workability. For advice how to best use our Specialties, contact our competent technical staff.

Product data sheet

BOCAREPS™ (Boron carbide)

Boron carbide (B4C) is a dark grey–black material comprising 76.5–78 wt% boron, with an exceptional hardness that is only exceeded by diamond and cubic boron nitride.

Product Data Sheet

Safety data sheet and technical data sheet

Product Data Sheet center

If you are looking for our product safety datasheets, you can also go to our product safety datasheet center


Discover the different silicon based materials for refractory applications, each with unique properties that are specifically crafted to meet the demands of high-temperature environments:

Silica Fume / Microsilica

Silica fume is a byproduct of the production of silicon metal or ferrosilicon alloys, and is a highly reactive pozzolanic material that is used as a supplementary cementitious material in concrete to improve its properties.

Read more about silica fume

Silicon powder / micronized silicon

Silicon powder is a finely ground, micronized form of elemental silicon that is used in a wide range of industrial applications, including metallurgy, ceramics, electronics, and more.

Read more about silicon powder

Specialties for Refractories

Specialties for refractories are various types of silicon products specifically designed for use in high-temperature applications. 

Read more about specialties for refractories


Elkem Materials Mixture Analyser

Elkem Materials Mixture Analyser

Get the best out of Elkem's silica fume (microsilica) by using our software to optimize your mixture


More about Refractory applications

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