R-S OSA Service OÜ

What R-S OSA Service OÜ does

R-S OSA Service OÜ is an Estonian private limited company and wholly-owned subsidiary of Sweden's Ragn-Sells Group, founded in 2019 to commercialize a proprietary process for valorizing oil shale ash accumulated in Ida-Viru County, Estonia. The company's core technology converts approximately 600 million tonnes of legacy industrial ash waste into ultra-pure, carbon-negative calcium carbonate (CaCO3) — with a reported footprint of -0.4 kgCO2eq per kilogram versus 0.006 kgCO2eq for conventional alternatives — while simultaneously binding approximately 250,000 tonnes of CO2 into the material annually at planned commercial scale. The process also extracts magnesium, silicon, aluminum, and iron for separate industrial and agricultural use.

The business model targets European industrial manufacturers in paints and coatings, plastics, paper, flooring, window frames, construction materials, and agricultural lime fertilizer. Revenue is generated by selling climate-positive calcium carbonate and co-products in bulk industrial quantities via direct B2B sales, supported by development cooperation agreements with end users to test product properties and design final products. Named engagement partners include Primatek (paint, Narva), Tarkett (flooring, France), and Gealan (window frames, Germany), with Eesti Energia and VKG providing feedstock access. Go-to-market is supplemented by COP-level climate conference presence and academic collaborations with University of Tartu, TalTech, and the Estonian University of Life Sciences.

The company is pre-revenue, with a demo plant lease signed in July 2025 at Kulgu Industrial Park in Narva (operations targeted for 2026) and a planned commercial-scale plant of 500,000 tonnes of calcium carbonate per year. To date, R-S OSA Service has secured over €3 million in EU Cohesion Fund, Enterprise Estonia, Archimedes Foundation, and ERDF grants, plus over €4 million of project investment. Patents covering the ash valorisation process have been filed with the Estonian Patent Office. The company employs 1-10 people directly and expects 50-100 direct jobs once the commercial plant is operational.

Name

R-S OSA Service OÜ

Legal name

R-S OSA Service OÜ

Website

https://osaservice.ee

Company type

Private

Founded year

2019

Operating status

Operating

Headcount range

1–10 employees

Short description

R-S OSA Service OÜ is an Estonian subsidiary of Ragn-Sells Group that converts accumulated oil shale ash waste into carbon-negative calcium carbonate, lime fertilizer, and critical raw materials for European industrial manufacturers in paints, plastics, construction, and agriculture.

Ownership category

akta.pro rank

Product category

Industrial Minerals

NAICS

Nonmetallic Mineral Mining and Quarrying (2123)

SIC

Industrial Inorganic Chemicals (2810), Mining & Quarrying Of Nonmetallic Minerals (No Fuels) (1400)

akta.pro primary industry

Soil Amendments & Conditioners (Lime/Gypsum/Humates) (IMAEAEAH)

akta.pro secondary industry

Mineral Soil Amendments (Lime, Gypsum, Rock Phosphate, Sulfur, Trace Minerals) (AFABAKAF)

Keywords

• Circular economy materials
• Industrial waste valorization
• Calcium carbonate production
• Lime fertilizer manufacturing
• Carbon capture minerals

Headquarters

HQ city

Tallinn

HQ country

Estonia

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Calcium Carbonate Sales: The primary revenue stream is from selling ultra-pure, climate-positive calcium carbonate produced from oil shale ash to industrial manufacturers. Target industries include paints, plastics, paper, floor coverings, window frames, and construction materials. The commercial plant planned for Narva will produce 500,000 tonnes annually.
2. Lime Fertilizer Sales: The process also produces lime fertilizer from processed oil shale ash for agricultural use, providing another product revenue stream.
3. Industrial Mineral Products: Additional revenue from extracted elements such as magnesium, silicon, and aluminum compounds for use in various industrial applications including fertilizers, chemicals, and construction materials.

Go-to-market motion3 records

Distribution channels1 record

Marketing channels5 records

Core offering

R-S OSA Service OÜ valorizes approximately 600 million tonnes of oil shale ash accumulated in Ida-Viru County, Estonia, converting it into ultra-pure, climate-positive calcium carbonate (CaCO3) and lime fertilizer via a proprietary carbon-neutral process that binds CO2 into the material. Its commercial plant (planned for Narva) is designed to produce 500,000 tonnes of calcium carbonate per year, supplying industrial manufacturers in paints, plastics, paper, flooring, window frames, and construction materials, while also extracting magnesium, silicon, aluminum and iron compounds for separate industrial use.

Product overview

R-S OSA Service OÜ operates as a circular economy company that transforms industrial waste (oil shale ash) into valuable raw materials through a proprietary, patented valorization process. The core product portfolio consists of climate-neutral/carbon-negative calcium carbonate, lime fertilizer, and derived paint products. The company is developing a demo plant in Narva (planned 2026) and a full-scale industrial plant (planned 2028) with capacity of 500,000 tonnes of calcium carbonate annually.

Differentiator

Problem solved

Functional benefit

Products and services

• Climate-Positive Calcium Carbonate (CaCO3) Ultra-pure calcium carbonate (CaCO3) produced from oil shale ash through a proprietary carbon-neutral/carbon-negative process that binds CO2 into the material (-0.4 kgCO2eq/kg). Supplied in bulk to industrial manufacturers in paints, plastics, paper, floor coverings, window frames, and construction materials.
• Lime Fertilizer Lime-based fertilizer containing calcium and magnesium compounds derived from processed oil shale ash, marketed to farmers and agricultural companies as a lower-carbon-footprint alternative to mined limestone for soil improvement and crop yields.
• Recycled Calcium Carbonate for White Powder Paint Recycled calcium carbonate derived from oil shale ash and validated for use as the mineral filler in white powder paint formulations; developed in partnership with Primatek and demonstrated to replace freshly mined raw materials in industrial coatings.

Quantifiable outcome

• Carbon-negative footprint of -0.4 kgCO2eq per kilogram (vs 0.006 kgCO2eq for conventional calcium carbonate)
• +3 more outcomes

Named customers4 records

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Eleven partnerships are on record, tiered core and secondary.

• Ragn-Sells GroupcoreStrategic or Co-development Partner · 1 January 2019Swedish parent company that established R-S OSA Service OÜ in Estonia for the oil shale ash valorisation project. Provides corporate resources, technology development expertise from similar Scandinavian projects, and international network. Ragn-Sells has launched patented solutions in Scandinavia for extracting materials from mining waste.
• TalTech (Tallinn University of Technology)coreStrategic or Co-development PartnerTechnical university partner conducting basic and applied research on oil shale ash composition and processing technologies. Contributes scientific expertise in materials science, environmental technology, and industrial chemistry.
• University of TartucoreStrategic or Co-development PartnerClassical university conducting research on geology, mineralogy, and environmental sciences. Leading research on mapping critical raw materials in Ida-Viru County ash hills. Professor Kalle Kirsimäe leads geological studies.
• Estonian University of Life SciencessecondaryStrategic or Co-development PartnerAgricultural university involved in research on using extracted minerals for fertilizer production and sustainable agriculture applications.
• Eesti EnergiacoreStrategic or Co-development PartnerKey partner providing oil shale ash necessary for testing and research, and granting permission for experimental drilling and further exploration of ash hills. Ash originates from their power generation operations.
• GealansecondaryStrategic or Co-development PartnerGermany's largest window manufacturer testing calcium carbonate in their PVC profile production. Provides valuable feedback for product design and enhancement of the calcium carbonate for window frame applications.
• TarkettsecondaryStrategic or Co-development PartnerFrench flooring manufacturer (one of world's five largest) developing carbon-negative mineral fillers for vinyl floors using oil shale ash calcium carbonate. Partnership aims to achieve Tarkett's 2030 goal of 30% recycled raw materials.
• Ida-Viru Investment Agency (IVIA)secondaryStrategic or Co-development PartnerRegional investment agency that signed lease agreement with R-S OSA Service for demo plant location in Kulgu Industrial Park in Narva. Manages Narva Industrial Incubator facilities.
• Viru Keemia Group (VKG)secondaryStrategic or Co-development PartnerCompany whose Ahtme ash hill was drilled for exploration. Drilling results confirmed significant calcium, magnesium, iron, aluminum, silicon and other raw materials, generating continued interest in European business circles.
• PrimateksecondaryStrategic or Co-development PartnerNarva-based paint manufacturer that successfully tested white powder paint production using recycled calcium carbonate from oil shale ash. First trial batch completed and tested on metal surfaces with excellent results.
• Estonian Geological ServicesecondaryStrategic or Co-development PartnerGovernment geological survey collaborating with University of Tartu on mapping industrial waste deposits in Ida-Viru County for the Fair Transition Fund project on solid industrial waste recycling.

Scale indicators13 records

Recent moves8 records

Expansion highlights6 records

Broad incumbents

• Imerys: Global specialty minerals giant producing calcium carbonate fillers along with a wide portfolio of performance minerals (kaolin, perlite, talc, mica). Overlaps with OSA across target end-markets such as paints, plastics and construction but operates much more broadly.
• Lhoist Group: Global lime and mineral solutions producer with deep European footprint spanning burnt lime, hydrated lime and dolomitic products. Overlaps with OSA in calcium-based chemistries and adjacent fertilizer applications.
• Solvay: Major global chemicals producer with large soda ash and industrial carbonates operations, including supply into detergents, glass and carbon capture pathways. Indirect competitor in industrial carbonates with much broader portfolio.

Emerging players

• CarbonCure Technologies: Climate-tech company that injects captured CO2 into ready-mix concrete to permanently mineralize carbon. Comparable in its climate-negative framing and use of industrial CO2 chemistry, but applied to concrete rather than calcium carbonate fillers.
• Calix Limited: Australian-listed company developing advanced lime/calcium-based platforms for CO2 capture, water treatment and industrial minerals. Comparable in its focus on next-generation calcium/lime chemistry for industrial decarbonization.

Regional players

• Tata Chemicals: India-based major soda ash and industrial carbonates producer with significant operations in Europe and Africa via acquired assets. Indirect competitor in industrial carbonates, similar to OSA's end-markets but focused on sodium carbonate.
• Yara International: Norway-headquartered global leader in nitrogen fertilizers and specialty crop nutrition, including calcium-based soil amendments. Comparable in the lime fertilizer product line, though Yara's portfolio is dominated by nitrogen products.

Direct peers

• Minerals Technologies Inc. Through its Specialty Minerals subsidiary, MTI is the world's leading precipitated calcium carbonate (PCC) producer, supplying papermakers, paints and plastics. Directly competes in OSA's primary product category with an established global distribution footprint.
• Omya: World's largest producer of calcium carbonate (ground and precipitated) serving paints, plastics, paper, construction and adhesives. Most directly comparable competitor in industrial calcium carbonate, though Omya uses mined limestone rather than circular feedstock.
• Mississippi Lime Company: Vertically integrated producer of high-purity calcium products including quicklime, hydrated lime, precipitated calcium carbonate and calcium oxide. Comparable in calcium-based chemistry and downstream industrial markets.

Market position

Strengths5 records

Weaknesses4 records

Competitive moat6 records

Key risks5 records

Key highlights6 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 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 R-S OSA Service OÜ