Calsitherm

What Calsitherm does

Calsitherm (legal entity: CALSITHERM Silikatbaustoffe GmbH) is a privately held German specialty manufacturer of calcium silicate thermal insulation materials, founded in 1977 in Paderborn by the Wüseke and Hölscher families. It operates as Germany's only producer of calcium silicate insulation, manufacturing boards and shaped parts with densities from 150 to 1,400 kg/m³ and temperature ratings up to 1,600 °C (the latter via its CALUTHERM calcium-aluminate line). The portfolio is organized into application families — interior insulation and mould prevention (Calsitherm Klimaplatte, REDBOARD), industrial high-temperature insulation (MICROCAL, SILCAL, SILCATEC, SILCAPAN), fire protection (SILCA 250KM, SILCAPROTECT, SILCA T300/T500), domestic fireplaces and chimneys (SILCAHEAT, SILCAPAN 750FB, SILCARAPID 850CB), and non-ferrous metal foundry products (CALCAST CC series) — alongside Sialon and silicon-nitride ceramics from the 2018-acquired International Syalons subsidiary.

The business operates a vertically integrated model. Calsitherm Silikatbaustoffe GmbH manufactures at Paderborn; group-owned distribution companies (SILCA Service- und Vertriebsgesellschaft, redstone) and wholly-owned regional subsidiaries (SRS Amsterdam in the Netherlands, SILCA Italia, SILCA South Africa, SILCA CERÁMICO in Mexico, SILCA Insulation in Malaysia, International Syalons in the UK) cover European, African, Asian, and Latin American markets, with additional channel partners in the USA, Brazil, and Denmark. Revenue is generated through quote-based B2B sales on multi-year contracts to industrial customers in petrochemicals, cement, power, metallurgy, ceramics, and furnace construction, to non-ferrous metal foundries, and to the building renovation and fire protection channels; pricing is not publicly disclosed and is handled via direct technical sales and engineering consultation. The group reported EUR 45 million of revenue in 2018 with approximately 180 employees, holds DIN EN ISO 9001:2015 and DIN EN 14306 certifications, and maintains a Type III Environmental Product Declaration (EPD) verified by Institut Bauen und Umwelt (IBU), most recently refreshed at BAU 2025.

Name

Calsitherm

Legal name

CALSITHERM Silikatbaustoffe GmbH

Website

https://calsitherm.de

Company type

Private

Founded year

1977

Operating status

Operating

Headcount range

51–100 employees

Short description

Calsitherm is Germany's only manufacturer of calcium silicate thermal insulation materials, producing boards and shaped parts (150–1,400 kg/m³, up to 1,600°C) for industrial high-temperature, fire protection, non-ferrous foundry, fireplace, and building-renovation customers worldwide.

Ownership category

akta.pro rank

Product category

Industrial Thermal Insulation Materials

NAICS

Clay Building Material and Refractories Manufacturing (327120)

SIC

Industrial Process Furnaces & Ovens (3567), Heating Equipment, Except Electric & Warm Air Furnaces (3433)

akta.pro primary industry

Calcium Silicate Bricks & Blocks (IMADABAD)

akta.pro secondary industry

Aerospace Thermal Management, Insulation & Fire Protection Materials (IMABANAE)

Keywords

• Calcium silicate insulation
• High-temperature insulation materials
• Industrial thermal insulation
• Fire protection boards
• Non-ferrous metal foundry supplies

Headquarters

HQ city

Bad Lippspringe

HQ country

Germany

HQ region

Europe

Offices10 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. Calcium silicate product sales: Direct sales of calcium silicate thermal insulation materials and fire protection products to industrial customers and building renovation market

Pricing tiers

Go-to-market motion2 records

Distribution channels4 records

Marketing channels4 records

Core offering

Calsitherm manufactures calcium silicate thermal insulation materials in Germany with densities from 150 to 1,400 kg/m³ for industrial, building renovation, fire protection, and non-ferrous metal casting applications. The company produces high-temperature insulation rated up to 1,600°C, microporous fire protection boards, domestic fireplace insulation, and ecological internal insulation boards. Product families include SILCA, SILCAL, MICROCAL, SILCAPAN, SILCATEC, CALCAST, CALUTHERM, REDBOARD, and the Calsitherm Klimaplatte.

Product overview

CALSITHERM is Germany's only manufacturer of calcium silicate thermal insulation materials, producing a comprehensive portfolio of products since 1977. The product range includes fire protection boards (SILCA series including SILCA 250KM, SILCAHEAT 600C, SILCAPROTECT, SILCA T300/T500), domestic fireplace boards (SILCAPAN 750FB, SILCARAPID 850CB), industrial insulation materials (SILCAL, MICROCAL, SILCAPAN, SILCATEC), non-ferrous metal casting solutions (CALCAST CC series), and high-temperature products (CALUTHERM up to 1600°C). The company also offers interior insulation solutions through its REDBOARD brand and the well-known Calsitherm Klimaplatte. These products serve diverse applications including industrial furnaces, fireplaces, building renovation, non-ferrous metal foundries, and plant construction. CALSITHERM operates as a manufacturing company with products distributed through its subsidiary SILCA Service- und Vertriebsgesellschaft für Dämmstoffe mbH.

Differentiator

Problem solved

Functional benefit

Brands

• Calsitherm Klimaplatte: Climate board for thermal insulation in building renovation
• CALUTHERM
• CALCAST
• SILCA
• REDBOARD
• SILCAPAN
• SILCATEC
• SILCAHEAT
• SILCARAPID
• SILCAPROTECT
• MICROCAL
• SILCAL
• KP-Kleber SB

Products and services

• SILCA 250KM Established thermal insulation board used to protect adjacent walls and line fireplaces in domestic applications.
• SILCAHEAT 600C Thermal insulation board with high graphite content providing pleasant radiant heat for fireplace operation with simple installation.
• SILCAPAN 750FB Combustion chamber board with excellent insulation properties enabling faster reaching of stationary temperature and reduced emissions; available in white (750FB) or dark grey (750FB-G) surface.
• SILCARAPID 850CB Construction board with 17mm thickness for simple and versatile fireplace installation without additional plastering.
• SILCAPROTECT Medium-weight fire protection board based on calcium silica hydrate with special additives for ventilation ducts, gas flue shafts, fire dampers, walls, ceilings, and IT safety cabinets.
• SILCA T300 / T500 Lightweight fire protection boards for shipbuilding and industrial applications including fire protection doors, gates, safety lockers, and containers.
• CALCAST CC Series High-density calcium silicate products for non-ferrous metal casting including electrolysis, low-pressure casting, pressure casting, and aluminum casting applications.
• SILCAL 900 / 1000 / 1100 High-temperature insulation materials for industrial furnace construction and refractory technology applications.
• MICROCAL 1100 Microporous calcium silicate thermal insulation for high-temperature industrial applications.
• SILCAPAN 845 / 850 Heavy calcium silicate materials for industrial furnace and plant construction, suitable for load-bearing fire protection structures.
• SILCATEC 1000E / 1000HD High-temperature insulation materials for machinery and plant construction applications up to 1000°C.
• CALUTHERM HS-9-PR-730 Highly porous thermal insulation and functional material based on calcium aluminate for special high-temperature applications up to 1,300°C (briefly to 1,400°C), with bulk density of 975 kg/m³ and over 60% porosity.
• CALUTHERM HY-9-PR-1600 Highly porous thermal insulation and functional material based on calcium aluminate for high-temperature applications up to 1,500°C (briefly to 1,600°C), with bulk density of 1,250 kg/m³.
• REDBOARD Wellness board for best room climate, available in pro and basic variants, for healthy interior insulation with calcium silicate.
• Calsitherm Klimaplatte Calcium silicate climate board for thermal insulation in building renovation, mold prevention, and interior insulation applications, including historic and heritage buildings.

Quantifiable outcome

• Products specified in major European landmarks including Olympic Stadium Kiev, Elbphilharmonie Hamburg, and Rijksmuseum Amsterdam

Named customers7 records

Segments5 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

13 partnerships are on record, tiered core and minor.

• redstone GmbH & Co. KGcoreChannel Partner/ Reseller/ Distributor · 27 June 2019Exclusive distribution partnership from autumn 2019. Redstone, the specialist for mould remediation and internal insulation solutions, exclusively distributes the Calsitherm Klimaplatte and complementary products. Calsitherm transferred climate board distribution for building materials and paint trade to Redstone, focusing exclusively on manufacturing calcium silicate products at Paderborn site.
• International Syalons (Newcastle) Ltd.coreStrategic or Co-development Partner · 18 July 2018Acquired July 2018. Leading provider of Sialon and silicon nitride-based high-performance ceramics in Europe. Products used in aerospace, automotive, chemical processing, and high-temperature sensor industries. Previously distributed via SRS Amsterdam. Thermo element protection tubes, pyrometer protection tubes made of silicon carbide and cast iron pipes with ceramic coating complement the Calsitherm/Silca product range.
• Industrial Products International, Inc.minorChannel Partner/ Reseller/ DistributorStrategic partner for USA market based in Englewood, Colorado
• Alfa Trend Ind. e Com. LtdaminorChannel Partner/ Reseller/ DistributorStrategic partner for Brazil based in Indaiatuba, São Paulo
• Simonsen a/sminorChannel Partner/ Reseller/ DistributorStrategic partner for Denmark based in Nykobing Mors
• SILCA Service- und Vertriebsgesellschaft für Dämmstoffe mbHcoreChannel Partner/ Reseller/ DistributorGroup-owned distribution company covering industrial thermal insulation sales in Germany and Europe
• CALSITHERM International GmbHcoreChannel Partner/ Reseller/ DistributorGroup company for international sales coordination
• CALSITHERM Verwaltungs GmbHcoreOthersAdministrative holding company for the group
• SRS Amsterdam B.V.coreChannel Partner/ Reseller/ DistributorGroup subsidiary in Netherlands handling Benelux distribution
• SILCA Italia srlcoreChannel Partner/ Reseller/ DistributorGroup subsidiary in Italy for Italian market distribution
• SILCA South Africa (pty) Ltd.minorChannel Partner/ Reseller/ DistributorGroup subsidiary in South Africa for African market distribution
• SILCA CERÁMICO PRODUCTOS S.A. DE C.V.minorChannel Partner/ Reseller/ DistributorGroup subsidiary in Mexico for Mexican and Latin American market distribution
• SILCA Insulation (SEA) SDN. BHD.minorChannel Partner/ Reseller/ DistributorGroup subsidiary in Malaysia for Southeast Asian market distribution

Scale indicators5 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Promat (Etex Group): Belgian-headquartered specialist in passive fire protection and high-temperature insulation, including MICROTHERM microporous calcium silicate boards. Directly comparable to Calsitherm's CALUTHERM and SILCAPROTECT portfolios, serving identical industrial furnace and fire-protection customers globally.
• Isolite Insulating Products: Japanese manufacturer of Isoslate calcium silicate boards for industrial insulation, fire protection, and household appliance applications. Closely analogous product chemistry and vertical applications, particularly in foundry and high-temperature industrial uses similar to Calsitherm's CALCAST and SILCAL ranges.
• Insulcon Group: Dutch specialist distributor and converter of high-temperature insulation including calcium silicate boards and microporous products for European industrial markets. Highly comparable regional go-to-market profile serving the same petrochemical, steel, and foundry customers as Calsitherm's SILCA network.
• Pyrotek: Global specialist in high-temperature industrial materials serving non-ferrous metal casting, aluminum, and glass industries. Directly comparable to Calsitherm's CALCAST non-ferrous foundry line and complementary in furnace and molten-metal handling applications.
• BNZ Materials: US-based manufacturer of BNZ-Block calcium silicate insulation for industrial, marine, and fire-protection applications. Directly comparable in calcium silicate chemistry and end-market mix, with overlapping industrial furnace and shipbuilding fire-protection customer base.
• Skamol A/S: Danish manufacturer of SkamoEnclosure calcium silicate boards and high-temperature insulation products for industrial and building applications. Closest direct competitor in calcium silicate chemistry, serving the same European industrial and fireplace markets as Calsitherm's SILCA and Klimaplatte lines.

Broad incumbents

• Morgan Advanced Materials (Thermal Ceramics): UK-listed global leader in high-temperature insulation, refractory ceramics, and engineered thermal solutions with substantially broader product portfolio. Overlaps with Calsitherm in industrial furnace insulation and fire protection but competes at a much larger scale across multiple ceramic chemistries.
• RHI Magnesita: Austrian-listed global refractories incumbent serving steel, cement, glass, and non-ferrous industries with a much larger portfolio of basic and non-basic refractory products. Overlaps with Calsitherm's SILCAL/MICROCAL and CALCAST lines in industrial furnace linings and foundry, but at significantly larger scale and broader chemistries.
• Unifrax: US-based global specialty insulation manufacturer of high-temperature fiber products (ceramic fiber, Alkali-resistant, microporous) for industrial and EV battery applications. Increasingly competitive with Calsitherm's CALUTHERM microporous calcium aluminate products in high-temperature industrial markets.
• Knauf Insulation: German-headquartered global insulation manufacturer dominant in mineral wool, glass wool, and other fibrous insulation for building and industrial applications. Competes indirectly with Calsitherm's Klimaplatte in building renovation but at vastly larger scale and broader chemistry portfolio.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/133541906792429

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Subsidiaries10 records

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 Calsitherm