About CARBON-U
Carbon Utilization &
Circular Calcium Materials
The “U” in CARBON-U stands for Utilization. CARBON-U turns discarded calcium and emitted carbon into something industry can use again — at industrial scale.
Company Overview
A technology company turning
industrial by-products and CO₂ into calcium materials
CARBON-U is a climate tech company that, building on C-PCC — a technology that fixes CO₂ with calcium from alkaline industrial by-products — is pursuing its first commercialization in Tongyeong oyster-shell upcycling (OCC · solid bio CaCl₂ · high-purity CaCO₃) and, over the long term, expanding into carbon mineralization and onshore CO₂ storage.
| Company name | CARBONU Co., Ltd. (주식회사 카본유) Brand: CARBON-U (Carbon Utilization) |
|---|---|
| Founded | June 9, 2025 Spun off from EXCarbon Co., Ltd. (per corporate registry) |
| CEO | Ha Seong Jang |
| Headquarters | Room 505, 5F, 195 Donam-ro, Tongyeong-si, Gyeongsangnam-do, Korea (Tongyeong Restart Platform) Carbon-neutral business relocated to Tongyeong in Aug 2026 |
| Production & demonstration facility | Ulsan C-PCC plant — Light Industry Bldg. 2, 4F, 135 Cheoyongsaneop 3-gil, Cheongnyang-eup, Ulju-gun, Ulsan, Korea 5 t/day production verified with industrial by-products |
| Intellectual property | 4 registered patents (owner: CARBONU Co., Ltd.) · 6 pending applications |
| Core business | C-PCC (CO₂-converted precipitated calcium carbonate) Oyster-shell upcycling — OCC · solid bio-CaCl₂ · high-purity CaCO₃ Onshore CO₂ storage Future |
| Contact | T. 052-260-9200 · F. 052-222-2509 |
Vision & Mission
Carbon Circularity
for a Sustainable Future
Innovate for a sustainable future — the line CARBON-U has used from day one, made concrete as an industry where carbon and calcium circulate.
Industry where carbon circulates,
regions where waste becomes feedstock.
Turn industrial by-products and CO₂ into new resources and materials, building an industrial future where carbon neutrality and resource circularity go together.
Future Value
Fix CO₂ in materials, then extend to storage
Landfilled and abandoned waste becomes calcium feedstock
Even process residue into construction materials — our aim
Calcium materials that replace mined and imported ones
Regional problems into regional industry
History
History
CARBON-U's technology has been built through industrial by-product calcium carbonate demonstrations since 2021; since incorporation in 2025, it has been preparing its first commercialization with Tongyeong oyster shells.
Company
CARBONU Co., Ltd. founded
Spun off from EXCarbon Co., Ltd. (registered June 9, 2025). EXCarbon continues as the surviving entity, running equipment manufacturing and maintenance, carbon/ESG consulting, and energy audit/ESCO businesses.
C-PCC business
CO₂-converted calcium carbonate (C-PCC) established as CARBON-U's core business; finance and investment functions set up.
4 registered patents transferred
Ownership of 4 core C-PCC patents transferred to CARBONU Co., Ltd. (Sep 16, 2025)
High-value oyster-shell upcycling R&D
Development of three products: OCC · ultra-high-purity calcium carbonate · solid CaCl₂. Article: “Trends in CO₂ Mineralization and Onshore Geological Storage” (KOMIR Technology & World, Vol. 5).
Carbon-neutral business relocated to Tongyeong
Moved into Tongyeong Restart Platform — an on-site business model next to the oyster-shell source.
OCC 500 t/yr pilot launched
Pilot to secure oyster-shell data on quality, yield, cost, carbon and customers.
Technology Heritage
Neogreen Co., Ltd. founded
Renamed EXCarbon Co., Ltd. in 2024 — the pre-spin-off entity of CARBONU
CO₂ Regulation-Free Special Zone demonstration program
Built a high-grade calcium carbonate synthesis plant for high-value products (steel-slag extraction; total program KRW 17.7 billion)
R&D Special Zone program
Development and commercialization of a calcium carbonate–titanium dioxide composite white pigment from industrial by-products
First registered patent
No. 10-2444775: Method for producing precipitated calcium carbonate from waste concrete fines
2023 Excellent Patent Grand Prize
Method for producing agglomerated calcium carbonate (No. 10-2621557)
Purchase-Conditional New Product Development program
Calcium carbonate made with CO₂ conversion technology and eco-friendly carbon-neutral PVC synthetic leather fabric
2024 National Quality Innovation Competition — Gold Prize, New Product Development (NPD)
Certificate from the Minister of Trade, Industry and Energy · Presidential Award for Excellent Quality Circle, 50th National Quality Management Convention — awarded to EXCarbon. C-PCC from desulfurization gypsum and Class C fly ash
The 4 registered patents were fully transferred to CARBONU Co., Ltd. on Sep 16, 2025 (per patent register). Awards and projects before 2025 are in the name of the pre-spin-off entity (Neogreen → EXCarbon).
Roadmap Company plan
OCC demonstration · first sales target
Bio-calcium chloride commercialization
High-purity calcium carbonate (oyster shells)
High-purity calcium carbonate (industrial by-products) · mine-void/ground fill
Onshore CO₂ storage business
KOSDAQ listing target
Leadership
The people who built the technology
and the people who will commercialize it
Ha Seong Jang
Technology · R&D · Product
A chemical engineer from LG Chem. Drawing on inorganic-materials technical sales, start-up management and commercialization of by-product materials (fly ash, blast-furnace slag), he leads CARBON-U's oyster-shell process and product development.
- B.S., Industrial Chemistry, Hanyang University
- 1993–1998 LG Chem, Industrial Materials Division — new product and market development
- 1999–2008 Sailine, Sales Director · 2008–2017 NeoN/Neobond, Technical Sales Director
- 2018– CEO, Neogreen (energy service company)
- Technology transfer (UNIST, 2014): 2 cement-free binders · 4 government/agency projects selected (2015–16)
Jung-Lak Suh
Corporate Finance · M&A · Turnaround
With about 18 years in bank corporate finance and 7 years as a corporate CFO, he designs and raises the funding from pilot to commercialization, and leads CARBON-U's investment, policy finance and finance functions as well as IPO preparation.
- Graduate, Hanyang University
- 1995–2014 Corporate banking at Citi, Kyongnam and SC First Bank (Branch Manager, SC First Bank Ulsan Corporate Banking)
- 2014–2017 CFO, Alpec · Ilsung Hysco — led completion of corporate rehabilitation
- 2017–2021 Representative, JK Holdings — M&A and advisory
- 2021–2025 CFO, Luxco · Younggwang; Head of Financial Planning, Gasentec
Partners / Ecosystem
A partner ecosystem from feedstock to demand
CARBON-U's business is complete when those who supply feedstock, those who demonstrate with us and those who use the materials are connected.
Feedstock
- Tongyeong oyster shells — linkage with regional recycling infrastructure under discussion
- Sites generating steel slag · CBS dust · desulfurization gypsum · Class C fly ash
Demonstration · testing
- 3 KTR accredited tests (C-PCC samples)
- Ultra-high-purity calcium carbonate test report — to be issued by Gyeongsang National University
- National R&D · Regulation-Free Special Zone demonstration
Demand · co-development
- Purchase-conditional project — automotive interior suppliers and others
- Calcium carbonate substitution supply record — materials company
Policy · region
- Tenant of Tongyeong Restart Platform
- Article in KOMIR “Technology & World”
- Proposals for policy demonstration with local governments and public agencies
※ Partner names are shown as initials within the scope of disclosure consent. Logos will be added with each partner's consent.