ISOMAG

What ISOMAG does

ISOMAG GmbH is an Austrian specialty manufacturer of steelworks and foundry auxiliaries, founded in 1987 in Leoben-Donawitz and now headquartered in Hart bei Graz with production consolidated at Kraubath an der Mur since 2014. The company develops, produces, distributes, and trades refractory products (Feuerfestprodukte) and foundry auxiliary materials (Giessereihilfsstoffe), organized into three product categories aligned to metallurgical process stages: secondary metallurgy (SYNTOP synthetic top slags, SFS slide gate filling sand, MAGNOLIGHT POWDER insulating agent), block casting (ISO EX 26 exothermic covering powder, EXOPLATE exothermic covering plate, THERMO D3 anti-piping powder), and the ESU electro-slag remelting process (AKF pre-molten slags based on alumina, lime, and fluorspar). Products are mechanical and chemical mixtures of CaO, MgO, Al2O3, SiO2, and other oxides formulated to specific steel grades and customer specifications, with documented specific consumption rates ranging from ~1.5-4 kg/t steel for block casting powders up to ~20 kg/t steel for ESU fluxes.

The company operates a B2B direct-sales motion targeting steel mills, foundries, and refractory customers in the heavy and light metals industry across the DACH region and beyond. Pricing is quote-based via phone and email (no public price list) and emphasizes customization, short delivery times, and small-batch production, including customer-specific slag compositions and trial quantities. Customer relationships are managed through field-level enterprise engagement, with no intermediary resellers, no app, no public API, and no digital self-service channel.

ISOMAG is privately held by the Heckel-Schlögl family, with Regine Heckel-Schlögl serving as Managing Director. The company has no subsidiaries, no parent, no external investors, and no disclosed funding rounds. It employs 11-50 people, holds an ISO 9001 quality management certification (continuous since 1999, renewed through 2026), and operates a strategic partnership with MAGNOLITHE GmbH (Graz / St. Lorenzen bei Knittelfeld, producing formed and unformed refractory products since 1965) to offer steel industry customers a coordinated refractory and auxiliary-materials program.

Name

ISOMAG

Legal name

Isomag GmbH

Website

https://isomag.at

Company type

Private

Founded year

1987

Operating status

Operating

Headcount range

11–50 employees

Short description

ISOMAG GmbH is an Austrian specialty manufacturer of steelworks and foundry auxiliaries — synthetic slags, exothermic covering powders, and pre-molten ESU fluxes — sold directly to steel mills and foundries across the DACH region and beyond.

Ownership category

akta.pro rank

Product category

Steel Mill and Foundry Auxiliary Materials

akta.pro primary industry

Refractory & Metallurgical Consumables Distribution (Fluxes, electrodes, refractories) (IMAKAJAM)

Keywords

• Refractory products manufacturing
• Steel mill auxiliaries
• Foundry casting materials
• Synthetic slag production
• Metallurgical consumables

Headquarters

HQ city

Graz

HQ country

Austria

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Technology or R&D, Infrastructure, Marketing or Sales

Revenue model

1. Refractory Products and Foundry Auxiliary Materials: Development, production, distribution and trade of refractory products (Feuerfestprodukte) and foundry auxiliary materials (Giessereihilfsstoffe) for steel mills and foundries.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels2 records

Core offering

ISOMAG manufactures and supplies steel mill and foundry auxiliary materials — synthetic slags, exothermic covering powders and plates, insulating covering agents, ladle filling sands, and pre-molten slags for the Electro-Slag Remelting (ESU) process. The products are sold to steel mills and foundries in the heavy and light metals industries for metallurgical process optimization, secondary metallurgy, block casting, and ESU remelting operations. Custom compositions tailored to individual customer steel grades and small-batch testing quantities are a core part of the offering.

Product overview

ISOMAG GmbH is a manufacturer of high-quality steel mill and foundry auxiliary materials, organized into three product categories: (1) Secondary Metallurgy products including SYNTOP (synthetic slags for ladle), SFS (ladle filling sand), and MAGNOLIGHT POWDER (insulating covering agent); (2) Block Casting products including ISO EX 26 (exothermic covering powder), EXOPLATE (exothermic covering plate), and THERMO D3 (highly exothermic anti-pipe powder); and (3) ESU (Electro-Slag Remelting) Process products including AKF (pre-molten slags). The company serves steel industry and foundry operations in heavy and light metals sectors, offering tailored solutions for metallurgical process optimization.

Differentiator

Problem solved

Functional benefit

Brands

• SYNTOP: Synthetic top slags for ladle covering in secondary metallurgy, covering primary to tertiary metallurgy range.
• SFS
• MAGNOLIGHT POWDER
• ISO EX 26
• EXOPLATE
• THERMO D3
• AKF

Products and services

• SYNTOP Synthetic top slags for ladle covering in primary to tertiary metallurgy, composed of CaO, MgO, Al2O3, and SiO2 with typical grain size 0-5mm. Supports desulfurization, deoxidation, increases purity, and reduces heat loss during secondary metallurgy processes. Targeted at steel mills requiring reproducible high-quality steel grades.
• SFS Ladle filling sand for steel ladles based on quartzite with a specially developed grain size distribution and coating. Reduces cutting time with oxygen lances compared to conventional ladle filling sands. Targeted at steel mills performing ladle gate operations.
• MAGNOLIGHT POWDER Basic covering agent for ladle and tundish composed of MgO and SiO2. Protects melt from heat loss and reoxidation during casting. Bound SiO2 provides workplace health benefits. Grain size 0-0.5mm. Typical consumption 1-3 kg/t steel depending on ladle or distributor geometry. Targeted at steel mills seeking thermal insulation and melt protection during casting.
• ISO EX 26 Insulating covering powder with exothermic effect for head treatment in block casting, composed of Al and Al2O3. Ignition temperature above 300°C. Typical consumption approximately 4 kg/t steel. Targeted at foundries and steel mills performing block casting operations requiring shrinkage defect (lunker) minimization.
• EXOPLATE Exothermic covering plate for head treatment in block casting, pressed and tempered in formats up to 490x490mm (VK square) or 310x720mm (FL rectangular). Enables head treatment before mold filling. Particularly suited for casting stations with multiple molds. Targeted at foundries needing flexible, pre-formed exothermic plate formats.
• THERMO D3 High exothermic anti-lunker (anti-piping) powder for head treatment in block casting, used in combination with ISO EX 26. Composed of Ca, Si, and SiO2. Ignition temperature above 1,000°C. Specific consumption 1.5-2.5 kg/t steel depending on mold geometry. Targeted at foundries and steel mills requiring shrinkage cavity minimization in large ingot casting.
• AKF Pre-molten slag mixture based on Al2O3, CaO, and CaF2 (fluorspar) for the Electro-Slag Remelting (ESU) process. Composition based on the C-A-F phase diagram. Provides numerous standardized compositions for different steel grades and offers custom slag compositions on customer request. Bulk density 1.3-1.7 kg/dm³. Typical consumption approximately 20 kg/t steel. Targeted at steel producers using ESU remelting for high-purity steel grades.

Quantifiable outcome

• Reduced non-metallic inclusions through use of SYNTOP synthetic slags
• +5 more outcomes

Segments3 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

One partnership is on record.

• MAGNOLITHE GmbHcoreStrategic or Co-development PartnerMAGNOLITHE GmbH, headquartered in Graz with main production facility in St. Lorenzen near Knittelfeld, has been producing formed and unformed, basic and non-basic refractory materials since 1965. Both companies together offer a comprehensive and coordinated product program for steel mill requirements. The partnership enables ISOMAG to provide a complete solution offering for steel industry customers, combining ISOMAG's auxiliary materials with Magnolithe's refractory products.

Scale indicators2 records

Recent moves10 records

Expansion highlights4 records

Broad incumbents

• Resco Products: Refractory manufacturer serving steel, foundry, aluminum, and other process industries globally. Comparable as a competitor offering monolithic refractories and metallurgical consumables to steel mills and foundries, with overlap on ladle, tundish, and casting auxiliaries.
• RHI Magnesita: Global market leader in refractories serving steel, cement, glass, and nonferrous metals. Directly comparable because it supplies refractory linings and increasingly metallurgical consumables (fluxes, slags) to the same steel-mill and foundry customer base that ISOMAG serves, but at vastly greater scale and geographic reach.
• HarbisonWalker International: One of the largest refractory manufacturers in North America, supplying iron, steel, and foundry customers worldwide. Comparable because it sells metallurgical fluxes and specialty refractory products to the same end users as ISOMAG, though it focuses more on monolithic refractories and linings.
• Imerys (Refractory & Abrasives): Global specialty minerals group with a refractory and metallurgical solutions division serving steel and foundry customers. Comparable as a large-scale supplier of mineral-based metallurgical inputs and fluxes to the same downstream process industries as ISOMAG.
• Morgan Advanced Materials: Global manufacturer of advanced ceramics and refractory products for industrial applications including steel and foundry. Comparable because it supplies high-temperature consumables and engineered ceramic components to metallurgical customers overlapping with ISOMAG's end markets.
• Saint-Gobain (Performance Ceramics & Refractories): Global materials group with refractory and ceramic product lines serving steel, foundry, and high-temperature industries. Comparable as a broad-based incumbent supplying refractory and process consumables to the same metallurgical end users as ISOMAG.
• Refratechnik Group: Global refractory manufacturer serving steel, cement, glass, and nonferrous metals. Comparable as a competitor in refractory products and fluxes targeting the same metallurgical process customers; based in Germany, it overlaps with ISOMAG's core DACH-region steel industry base.
• Vesuvius plc: Global supplier of consumables and engineered refractories for the steel and foundry industries. Highly comparable as Vesuvius offers ladle powders, tundish powders, fluxes, and metallurgical auxiliaries — overlapping directly with ISOMAG's SYNTOP, MAGNOLIGHT, and EXOPLATE product lines, but across a much broader international footprint.

Emerging players

• Puyang Refractories Group (PRCO): Chinese refractory and metallurgical consumables manufacturer serving global steel and foundry markets with competitive pricing. Comparable as a direct competitor in ladle slag, tundish powder, and casting auxiliaries, with growing international reach that could pressure niche players like ISOMAG.

Direct peers

• Magnolithe GmbH: Austrian refractory producer established in 1965, headquartered in Graz with production in St. Lorenzen near Knittelfeld. Directly comparable and a current strategic partner of ISOMAG — both companies serve the same steel mill requirements, with Magnolithe supplying refractory linings and ISOMAG supplying the auxiliary consumables (slags, covering powders, ESU fluxes).

Market position

Weaknesses4 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/isomag-gmbh

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about ISOMAG